diff --git a/setup.py b/setup.py
index d7c4b44..bf1a062 100644
--- a/setup.py
+++ b/setup.py
@@ -61,7 +61,7 @@ class CreatePythonEnvironment(MyCommand):
 
 setup(
     name='django-deploy',
-    version='0.1.dev0',
+    version='0.2.dev0',
     description='Helper to deploy django apps.',
     url='https://dev.heinzelwerk.de/git/python/django-deploy',
     maintainer='Jens Kleineheismann',
diff --git a/src/django_deploy/__init__.py b/src/django_deploy/__init__.py
index bb17839..c6b8f0f 100644
--- a/src/django_deploy/__init__.py
+++ b/src/django_deploy/__init__.py
@@ -1,2 +1,2 @@
-from .config import get_installed_apps, get_urlpatterns
+from .hooks import get_installed_apps, get_urlpatterns
 from .main import main
diff --git a/src/django_deploy/api.py b/src/django_deploy/api.py
new file mode 100644
index 0000000..b9ca25c
--- /dev/null
+++ b/src/django_deploy/api.py
@@ -0,0 +1,167 @@
+import errno
+import importlib
+import json
+import os
+import sys
+
+from .base_types import OrderedDict
+from .config import DJANGO_SETTINGS_DIR
+from .exceptions import DjangoDeployError
+
+
+class DjangoProjectHooksConfig(OrderedDict):
+    def load(self, path=None):
+        if path is None:
+            path = self._json_file
+        if os.path.exists(path):
+            with open(path, 'r') as f:
+                items = json.load(f)
+                for item in items:
+                    app_name = item.pop('APP')
+                    self[app_name] = item
+        else:
+            self._clear()
+
+    def write(self, path=None):
+        if path is None:
+            path = self._json_file
+        with open(path, 'w') as f:
+            items = []
+            for key in self:
+                item = self[key]
+                item['APP'] = key
+                items.append(item)
+            json.dump(items, f, indent=4)
+
+    def __init__(self, project_dir=None, settings_dir=None):
+        assert (project_dir or settings_dir), 'DeployedAppsConfig(): ' \
+                                              'Either keyword argument project_dir or settings_dir' \
+                                              ' must be set.'
+        assert (not (project_dir and settings_dir)), 'DeployedAppsConfig(): ' \
+                                                     'Keyword arguments project_dir and settings_dir' \
+                                                     ' are mutually exclusive.'
+
+        super(DjangoProjectHooksConfig, self).__init__()
+
+        if project_dir is not None:
+            settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
+        self._json_file = os.path.join(settings_dir, 'django_deploy.json')
+        self.load()
+
+
+class DjangoProject(object):
+    _hooks_config_name = 'django_deploy_hooks'
+
+    @staticmethod
+    def _append_to_pythonfile(path, text):
+        py2_cache = path + 'c'
+        with open(path, 'a') as f:
+            f.write(text)
+            if os.path.isfile(py2_cache):
+                os.unlink(py2_cache)  # pragma: no cover
+
+    def _get_hooks_config_from_app(self, module_path, hooks_config_name=None):
+        if hooks_config_name is None:
+            hooks_config_name = self._hooks_config_name
+
+        try:
+            app_obj = importlib.import_module(module_path)
+        except ImportError as e:
+            raise DjangoDeployError(e, code=errno.ENOPKG)
+
+        try:
+            hooks_config = getattr(app_obj, hooks_config_name)
+        except AttributeError:
+            try:
+                hooks_config = importlib.import_module('{}.{}'.format(module_path, hooks_config_name))
+            except ImportError as e:
+                raise DjangoDeployError('In {}: {}'.format(module_path, e), code=errno.ENOENT)
+
+        return hooks_config
+
+    def create(self, install_hooks=True):
+        project_dir = self._project_dir
+
+        if not os.path.exists(project_dir):
+            os.makedirs(project_dir)
+
+        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
+        if os.path.exists(settings_dir):
+            raise DjangoDeployError('directory already exists: {}'.format(settings_dir), code=errno.EEXIST)
+
+        cmd = 'django-admin startproject {name} {path}'.format(name=DJANGO_SETTINGS_DIR,
+                                                               path=project_dir)
+        sys.stdout.write('Installing django files to {path}\n'.format(path=project_dir))
+        exitval = os.system(cmd)
+        if exitval != os.EX_OK:  # pragma: no cover
+            raise DjangoDeployError(exitval=exitval)
+
+        if install_hooks:
+            self.install_hooks()
+
+    def install_hooks(self):
+        project_dir = self._project_dir
+
+        if not os.path.exists(project_dir):
+            raise DjangoDeployError('No such project directory: {}'.format(project_dir),
+                                    code=errno.ENOENT)
+
+        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
+        settings_file = os.path.join(settings_dir, 'settings.py')
+        urlconf_file = os.path.join(settings_dir, 'urls.py')
+        json_file = os.path.join(settings_dir, 'django_deploy.json')
+
+        if not os.path.exists(settings_dir):
+            raise DjangoDeployError('Existing project directory'
+                                    ' does not contain django project: {}'.format(project_dir),
+                                    code=errno.EISDIR)
+
+        if os.path.exists(json_file):
+            raise DjangoDeployError('file already exists: {}'.format(json_file), code=errno.EEXIST)
+
+        config = DjangoProjectHooksConfig(project_dir=project_dir)
+        config.write()
+
+        text = '\n'
+        text += '# django-deploy\n'
+        text += 'from django_deploy import get_installed_apps\n'
+        text += 'INSTALLED_APPS = get_installed_apps(__file__, INSTALLED_APPS)\n'
+        text += '\n'
+        self._append_to_pythonfile(settings_file, text)
+
+        text = '\n'
+        text += '# django-deploy\n'
+        text += 'from django_deploy import get_urlpatterns\n'
+        text += 'urlpatterns = get_urlpatterns(__file__, urlpatterns)\n'
+        text += '\n'
+        self._append_to_pythonfile(urlconf_file, text)
+
+    def install_app(self, module_path, hooks_config_name=None):
+        hooks_config = self._get_hooks_config_from_app(module_path, hooks_config_name)
+        installed_apps = getattr(hooks_config, 'INSTALLED_APPS', [])
+
+        config = DjangoProjectHooksConfig(project_dir=self._project_dir)
+        if module_path not in config:
+            config[module_path] = {}
+
+        config[module_path]['INSTALLED_APPS'] = installed_apps
+        config.write()
+
+    def mount_app(self, module_path, route, hooks_config_name=None):
+        self.install_app(module_path, hooks_config_name=hooks_config_name)
+        hooks_config = self._get_hooks_config_from_app(module_path, hooks_config_name)
+        urlconf = getattr(hooks_config, 'ROOT_URLCONF', None)
+
+        if urlconf is None:
+            raise DjangoDeployError('django deploy hooks from {} has no ROOT_URLCONF'.format(module_path),
+                                    code=errno.ENOLINK)
+
+        config = DjangoProjectHooksConfig(project_dir=self._project_dir)
+        if module_path not in config:  # pragma: no cover
+            config[module_path] = {}
+
+        config[module_path]['MOUNT'] = [route, urlconf]
+        config.write()
+
+    def __init__(self, project_dir):
+        self._project_dir = project_dir
diff --git a/src/django_deploy/base_types.py b/src/django_deploy/base_types.py
new file mode 100644
index 0000000..89297e1
--- /dev/null
+++ b/src/django_deploy/base_types.py
@@ -0,0 +1,29 @@
+class OrderedDict(object):
+    def _clear(self):
+        self._items = {}
+        self._order = []
+
+    def __init__(self):
+        self._items = {}
+        self._order = []
+
+    def __contains__(self, key):
+        return key in self._items
+
+    def __getitem__(self, key):
+        return self._items[key]
+
+    def __setitem__(self, key, value):
+        self._items[key] = value
+        if key not in self._order:
+            self._order.append(key)
+
+    def __delitem__(self, key):
+        del self._items[key]
+        self._order.remove(key)
+
+    def __iter__(self):
+        return iter(self._order)
+
+    def __len__(self):
+        return len(self._items)
diff --git a/src/django_deploy/config.py b/src/django_deploy/config.py
index 53291ec..decb621 100644
--- a/src/django_deploy/config.py
+++ b/src/django_deploy/config.py
@@ -1,102 +1 @@
-try:
-    from collections.abc import MutableMapping
-except ImportError:  # pragma: no cover
-    from collections import MutableMapping
-import json
-import os
-
-from django.conf.urls import url, include
-
 DJANGO_SETTINGS_DIR = 'main'
-
-
-class _BaseDict(MutableMapping):
-    def __init__(self, *args, **kwargs):
-        super(_BaseDict, self).__init__(*args, **kwargs)
-        self._store = dict()
-        self.update(dict(*args, **kwargs))
-
-    def __getitem__(self, key):
-        return self._store[self.__keytransform__(key)]
-
-    def __setitem__(self, key, value):
-        self._store[self.__keytransform__(key)] = value
-
-    def __delitem__(self, key):
-        del self._store[self.__keytransform__(key)]
-
-    def __iter__(self):
-        return iter(self._store)
-
-    def __len__(self):
-        return len(self._store)
-
-    @staticmethod
-    def __keytransform__(key):
-        return key
-
-
-class DeployedAppsConfig(_BaseDict):  # pylint: disable=too-many-ancestors
-    def load(self, path=None):
-        if path is None:
-            path = self._json_file
-        if os.path.exists(path):
-            with open(path, 'r') as f:
-                self._store = json.load(f)
-        else:
-            self._store = dict()
-
-    def write(self, path=None):
-        if path is None:
-            path = self._json_file
-        with open(path, 'w') as f:
-            json.dump(self._store, f, indent=4)
-
-    def __init__(self, project_dir=None, settings_dir=None):
-        assert (project_dir or settings_dir), 'DeployedAppsConfig(): ' \
-                                              'Either keyword argument project_dir or settings_dir' \
-                                              ' must be set.'
-        assert (not (project_dir and settings_dir)), 'DeployedAppsConfig(): ' \
-                                                     'Keyword arguments project_dir and settings_dir' \
-                                                     ' are mutually exclusive.'
-        super(DeployedAppsConfig, self).__init__()
-        if project_dir is not None:
-            settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
-        self._json_file = os.path.join(settings_dir, 'django_deploy.json')
-        self.load()
-
-
-def get_installed_apps(file_path, installed_apps):
-    settings_dir = os.path.dirname(os.path.abspath(file_path))
-    config = DeployedAppsConfig(settings_dir=settings_dir)
-    app_list = installed_apps[:]
-    for wanting_app in config:
-        wanted_apps = config[wanting_app].get('INSTALLED_APPS', [])
-        for wanted_app in wanted_apps:
-            if wanted_app not in app_list:
-                app_list.append(wanted_app)
-    return app_list
-
-
-def get_urlpatterns(file_path, urlpatterns):
-    settings_dir = os.path.dirname(os.path.abspath(file_path))
-    config = DeployedAppsConfig(settings_dir=settings_dir)
-    urls_list = urlpatterns[:]
-    patterns = []
-    for url_obj in urls_list:
-        # Django 1 vs Django 2
-        if url_obj.__class__.__name__.startswith('Regex'):  # pragma: no cover
-            patterns.append(url_obj.regex.pattern)
-        else:  # pragma: no cover
-            patterns.append(str(url_obj.pattern))
-    for wanting_app in config:
-        wanted_urls = config[wanting_app].get('urlpatterns', [])
-        for wanted_url in wanted_urls:
-            pattern = wanted_url['pattern']
-            if pattern in patterns:
-                continue
-            if wanted_url['type'] == 'include':
-                url_obj = url(pattern, include(wanted_url['module']))
-                urls_list.append(url_obj)
-                patterns.append(pattern)
-    return urls_list
diff --git a/src/django_deploy/django_deploy_hooks.py b/src/django_deploy/django_deploy_hooks.py
new file mode 100644
index 0000000..20ad1be
--- /dev/null
+++ b/src/django_deploy/django_deploy_hooks.py
@@ -0,0 +1,2 @@
+# INSTALLED_APPS = ['django_deploy']
+# ROOT_URLCONF = '.urls'
diff --git a/src/django_deploy/django_settings.py b/src/django_deploy/django_settings.py
deleted file mode 100644
index 3b21247..0000000
--- a/src/django_deploy/django_settings.py
+++ /dev/null
@@ -1,4 +0,0 @@
-# ADD_INSTALLED_APPS = ['django_deploy']
-# ADD_URLPATTERNS = [
-#     {'type': 'include', 'pattern': '', 'module': 'django_deploy.urls'},
-# ]
diff --git a/src/django_deploy/exceptions.py b/src/django_deploy/exceptions.py
index 229a4c1..20ed203 100644
--- a/src/django_deploy/exceptions.py
+++ b/src/django_deploy/exceptions.py
@@ -1,7 +1,17 @@
-class FatalError(Exception):
-    def __init__(self, *args, **kwargs):
-        self._exitval = kwargs.pop('exitval', None)
-        super(FatalError, self).__init__(*args, **kwargs)
+class DjangoDeployError(Exception):
+    def __init__(self, message=None, code=None, exitval=None):
+        self._message = message
+        self._code = code
+        self._exitval = exitval
+        super(DjangoDeployError, self).__init__(message)
+
+    @property
+    def message(self):
+        return self._message
+
+    @property
+    def code(self):
+        return self._code
 
     @property
     def exitval(self):
diff --git a/src/django_deploy/hooks.py b/src/django_deploy/hooks.py
new file mode 100644
index 0000000..33f6a50
--- /dev/null
+++ b/src/django_deploy/hooks.py
@@ -0,0 +1,31 @@
+import os
+from django.conf.urls import url, include
+
+from .api import DjangoProjectHooksConfig
+
+
+def get_installed_apps(file_path, installed_apps):
+    settings_dir = os.path.dirname(os.path.abspath(file_path))
+    config = DjangoProjectHooksConfig(settings_dir=settings_dir)
+    app_list = installed_apps[:]
+    for wanting_app in config:
+        wanted_apps = config[wanting_app].get('INSTALLED_APPS', [])
+        for wanted_app in wanted_apps:
+            if wanted_app not in app_list:
+                app_list.append(wanted_app)
+    return app_list
+
+
+def get_urlpatterns(file_path, urlpatterns):
+    settings_dir = os.path.dirname(os.path.abspath(file_path))
+    config = DjangoProjectHooksConfig(settings_dir=settings_dir)
+    urls_list = urlpatterns[:]
+    for app in config:
+        if 'MOUNT' in config[app]:
+            route, urlconf_module = config[app]['MOUNT']
+            pattern = '^{}/'.format(route)
+            if urlconf_module.startswith('.'):
+                urlconf_module = '{}{}'.format(app, urlconf_module)
+            url_obj = url(pattern, include(urlconf_module))
+            urls_list.append(url_obj)
+    return urls_list
diff --git a/src/django_deploy/program.py b/src/django_deploy/program.py
index 55043e8..ed3229f 100644
--- a/src/django_deploy/program.py
+++ b/src/django_deploy/program.py
@@ -1,10 +1,10 @@
 import argparse
-import importlib
+import errno
 import os
 import sys
 
-from .config import DJANGO_SETTINGS_DIR, DeployedAppsConfig
-from .exceptions import FatalError
+from .api import DjangoProject
+from .exceptions import DjangoDeployError
 from .version import VERSION
 
 
@@ -14,18 +14,29 @@ class Program(object):  # pylint: disable=too-few-public-methods
         parser.add_argument('-V', '--version', action='version',
                             version='%(prog)s ' + VERSION)
 
-        parser.add_argument('-a', '--app',
-                            action='append', dest='merge_apps', metavar='MODULE',
-                            help='Merge settings from the django app MODULE\n'
-                                 'Can be used multiple times')
-
         parser.add_argument('-c', '--create',
                             action='store_true', dest='create',
                             help='Create the django project directory')
 
-        parser.add_argument('-e', '--enable',
-                            action='store_true', dest='enable',
-                            help='Enable django_deploy in an existing django project directory')
+        parser.add_argument('--no-install-hooks',
+                            action='store_true', dest='no_install_hooks',
+                            help='Do not install django deploy hooks while creating django project directory')
+
+        parser.add_argument('--install-hooks',
+                            action='store_true', dest='install_hooks',
+                            help='Install django deploy hooks into existing django project directory')
+
+        parser.add_argument('-a', '--install-app',
+                            action='append', dest='install_apps', metavar='MODULE',
+                            help='Merge settings from django app MODULE into django project settings'
+                                 '. Can be used multiple times')
+
+        parser.add_argument('-m', '--mount-app',
+                            nargs=2,
+                            action='append', dest='mount_apps', metavar=('MODULE', 'ROUTE'),
+                            help='Merge settings from django app MODULE into django project settings'
+                                 ' and add the app root urlconf to django root urlconf as ROUTE'
+                                 '. Can be used multiple times')
 
         parser.add_argument('project_dir', metavar='PATH',
                             help='The directory, where the django project is or will be installed.')
@@ -41,111 +52,64 @@ class Program(object):  # pylint: disable=too-few-public-methods
         return self._argparser.parse_args(argv)
 
     @staticmethod
-    def _append_to_pythonfile(path, text):
-        py2_cache = path + 'c'
-        with open(path, 'a') as f:
-            f.write(text)
-            if os.path.isfile(py2_cache):
-                os.unlink(py2_cache)  # pragma: no cover
-
-    def _append_to_settings(self, project_dir, code, comment):
-        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
-        settings_file = os.path.join(settings_dir, 'settings.py')
-
-        text = '\n' + comment + '\n' + code + '\n'
-        return self._append_to_pythonfile(settings_file, text)
-
-    def _append_to_urlconf(self, project_dir, code, comment):
-        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
-        settings_file = os.path.join(settings_dir, 'urls.py')
-
-        text = '\n' + comment + '\n' + code + '\n'
-        return self._append_to_pythonfile(settings_file, text)
+    def _create_django_project(project_dir, install_hooks=True):
+        project = DjangoProject(project_dir)
+        project.create(install_hooks=install_hooks)
 
     @staticmethod
-    def _install_django_files(project_dir, overwrite=False):
-        if not os.path.exists(project_dir):
-            os.makedirs(project_dir)
-
-        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
-        if os.path.exists(settings_dir) and not overwrite:
-            sys.stderr.write('directory already exists: {}\n'.format(settings_dir))
-            raise FatalError(exitval=os.EX_NOPERM)
-
-        cmd = 'django-admin startproject {name} {path}'.format(name=DJANGO_SETTINGS_DIR,
-                                                               path=project_dir)
-        sys.stdout.write('Installing django files to {path}\n'.format(path=project_dir))
-        exitval = os.system(cmd)
-        if exitval != os.EX_OK:  # pragma: no cover
-            raise FatalError(exitval=exitval)
+    def _install_hooks(project_dir):
+        project = DjangoProject(project_dir)
+        project.install_hooks()
 
     @staticmethod
-    def _install_django_deploy_files(project_dir, overwrite=False):
-        json_file = os.path.join(project_dir, DJANGO_SETTINGS_DIR, 'django_deploy.json')
-        if os.path.exists(json_file) and not overwrite:
-            sys.stderr.write('file already exists: {}\n'.format(json_file))
-            raise FatalError(exitval=os.EX_NOPERM)
-
-        config = DeployedAppsConfig(project_dir=project_dir)
-        config.write()
-
-    def _enable_django_deploy(self, project_dir):
-        settings_code = ''
-        settings_code += 'from django_deploy import get_installed_apps\n'
-        settings_code += 'INSTALLED_APPS = get_installed_apps(__file__, INSTALLED_APPS)\n'
-        settings_comment = '# django-deploy'
-        self._append_to_settings(project_dir, settings_code, settings_comment)
-        urlconf_code = ''
-        urlconf_code += 'from django_deploy import get_urlpatterns\n'
-        urlconf_code += 'urlpatterns = get_urlpatterns(__file__, urlpatterns)\n'
-        urlconf_comment = '# django-deploy'
-        self._append_to_urlconf(project_dir, urlconf_code, urlconf_comment)
+    def _install_app(project_dir, module_path):
+        project = DjangoProject(project_dir)
+        project.install_app(module_path)
 
     @staticmethod
-    def _add_installed_apps_from_app(project_dir, app):
-        settings_from_app = importlib.import_module('{}.django_settings'.format(app))
-        wanted_apps = getattr(settings_from_app, 'ADD_INSTALLED_APPS', [])
-
-        config = DeployedAppsConfig(project_dir=project_dir)
-        if app not in config:
-            config[app] = {}
-
-        config[app]['INSTALLED_APPS'] = wanted_apps
-        config.write()
-
-    @staticmethod
-    def _add_urlpatterns_from_app(project_dir, app):
-        settings_from_app = importlib.import_module('{}.django_settings'.format(app))
-        wanted_urls = getattr(settings_from_app, 'ADD_URLPATTERNS', [])
-
-        config = DeployedAppsConfig(project_dir=project_dir)
-        if app not in config:  # pragma: no cover
-            config[app] = {}
-
-        config[app]['urlpatterns'] = wanted_urls
-        config.write()
-
-    def _merge_app(self, project_dir, app):
-        self._add_installed_apps_from_app(project_dir, app)
-        self._add_urlpatterns_from_app(project_dir, app)
+    def _mount_app(project_dir, module_path, route):
+        project = DjangoProject(project_dir)
+        project.mount_app(module_path, route)
 
     def __init__(self):
         self._argparser = argparse.ArgumentParser()
         self._setup_argparser(self._argparser)
 
-    def __call__(self, *args, **kwargs):
+    def __call__(self, *args, **kwargs):  # pylint: disable=too-many-branches
         argv = kwargs.get('argv', None)
         cmd_args = self._parse_args(argv)
         exitval = os.EX_OK
+        exceptions = []
         try:
             if cmd_args.create:
-                self._install_django_files(cmd_args.project_dir)
-            if cmd_args.create or cmd_args.enable:
-                self._install_django_deploy_files(cmd_args.project_dir)
-                self._enable_django_deploy(cmd_args.project_dir)
-            if cmd_args.merge_apps:
-                for app in cmd_args.merge_apps:
-                    self._merge_app(cmd_args.project_dir, app)
-        except FatalError as e:
-            exitval = e.exitval
+                self._create_django_project(cmd_args.project_dir, install_hooks=not cmd_args.no_install_hooks)
+            if cmd_args.install_hooks:
+                self._install_hooks(cmd_args.project_dir)
+            if cmd_args.install_apps:
+                for app in cmd_args.install_apps:
+                    try:
+                        self._install_app(cmd_args.project_dir, app)
+                    except DjangoDeployError as e:
+                        if e.code in (errno.ENOPKG, errno.ENOENT):
+                            exceptions.append(e)
+                            continue
+                        raise  # pragma: no cover
+            if cmd_args.mount_apps:
+                for app, route in cmd_args.mount_apps:
+                    try:
+                        self._mount_app(cmd_args.project_dir, app, route)
+                    except DjangoDeployError as e:
+                        if e.code in (errno.ENOPKG, errno.ENOENT):
+                            exceptions.append(e)
+                            continue
+                        raise  # pragma: no cover
+        except DjangoDeployError as e:
+            exceptions.append(e)
+
+        for e in exceptions:
+            if e.message:
+                sys.stderr.write('{}\n'.format(e.message))
+            elif e.code:  # pragma: no cover
+                sys.stderr.write('{}\n'.format(os.strerror(e.code)))
+            exitval = e.exitval or os.EX_SOFTWARE
         return exitval
diff --git a/src/django_deploy/tests/base.py b/src/django_deploy/tests/base.py
new file mode 100644
index 0000000..8d8e5f1
--- /dev/null
+++ b/src/django_deploy/tests/base.py
@@ -0,0 +1,137 @@
+import importlib
+import os
+import sys
+import unittest
+import mock
+import pytest
+
+from ..config import DJANGO_SETTINGS_DIR
+
+
+class DjangoDeployTestCase(unittest.TestCase):
+    @pytest.fixture(autouse=True)
+    def tmpdir(self, tmpdir):  # pylint: disable=method-hidden
+        self.tmpdir = tmpdir
+
+    @staticmethod
+    def _import_from_dir(module_name, directory):
+        sys.path.insert(0, directory)
+        module = importlib.import_module(module_name)
+        if sys.version_info.major == 2:  # pragma: no cover
+            reload(module)  # pylint: disable=undefined-variable
+        else:  # pragma: no cover
+            importlib.reload(module)  # pylint: disable=no-member
+        sys.path.pop(0)
+        return module
+
+    def get_django_settings(self, project_dir):
+        module_name = 'settings'
+        directory = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
+        return self._import_from_dir(module_name, directory)
+
+    def get_django_root_urlconf(self, project_dir):
+        module_name = 'urls'
+        directory = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
+        sys.modules['django.contrib'] = mock.MagicMock(name='django.contrib')
+        return self._import_from_dir(module_name, directory)
+
+    def assert_django_project(self, project_dir):
+        self.assertTrue(os.path.isdir(project_dir), 'no directory: {}'.format(project_dir))
+        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
+        self.assertTrue(os.path.isdir(settings_dir), 'no directory: {}'.format(settings_dir))
+        settings_file = os.path.join(settings_dir, 'settings.py')
+        self.assertTrue(os.path.isfile(settings_file), 'no file: {}'.format(settings_file))
+        manage_script = os.path.join(project_dir, 'manage.py')
+        self.assertTrue(os.path.isfile(manage_script), 'no file: {}'.format(manage_script))
+
+    def assert_django_deploy_hooks(self, project_dir):
+        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
+        settings_file = os.path.join(settings_dir, 'settings.py')
+        urlconf_file = os.path.join(settings_dir, 'urls.py')
+        django_deploy_json = os.path.join(settings_dir, 'django_deploy.json')
+
+        self.assertTrue(os.path.isfile(django_deploy_json), 'no file: {}'.format(django_deploy_json))
+
+        with open(settings_file, 'r') as f:
+            needle = 'from django_deploy import get_installed_apps'
+            haystack = f.read()
+            self.assertIn(needle, haystack)
+
+        with open(urlconf_file, 'r') as f:
+            needle = 'from django_deploy import get_urlpatterns'
+            haystack = f.read()
+            self.assertIn(needle, haystack)
+
+    def assert_no_django_deploy_hooks(self, project_dir):
+        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
+        settings_file = os.path.join(settings_dir, 'settings.py')
+        urlconf_file = os.path.join(settings_dir, 'urls.py')
+        django_deploy_json = os.path.join(settings_dir, 'django_deploy.json')
+
+        self.assertFalse(os.path.isfile(django_deploy_json))
+
+        with open(settings_file, 'r') as f:
+            needle = 'from django_deploy import get_installed_apps'
+            haystack = f.read()
+            self.assertNotIn(needle, haystack)
+
+        with open(urlconf_file, 'r') as f:
+            needle = 'from django_deploy import get_urlpatterns'
+            haystack = f.read()
+            self.assertNotIn(needle, haystack)
+
+    def assert_installed_apps(self, project_dir, apps, default_apps=None):
+        settings = self.get_django_settings(project_dir)
+
+        if default_apps is None:
+            expected_apps = [
+                'django.contrib.admin',
+                'django.contrib.auth',
+                'django.contrib.contenttypes',
+                'django.contrib.sessions',
+                'django.contrib.messages',
+                'django.contrib.staticfiles',
+            ]
+        else:  # pragma: no cover
+            expected_apps = default_apps
+
+        expected_apps += apps
+
+        self.assertListEqual(expected_apps, settings.INSTALLED_APPS)
+
+    def assert_urlpatterns(self, project_dir, patterns):
+        root_urlconf = self.get_django_root_urlconf(project_dir)
+
+        # Django 2 vs Django 1
+        if hasattr(root_urlconf, 'path'):  # pragma: no cover
+            expected_urlpatterns = [
+                ('URLPattern', 'admin/', 'django.contrib.admin.site.urls'),
+            ]
+        else:  # pragma: no cover
+            expected_urlpatterns = [
+                ('URLPattern', '^admin/', 'django.contrib.admin.site.urls'),
+            ]
+        expected_urlpatterns += patterns
+
+        real_urlpatterns = root_urlconf.urlpatterns
+        self.assertEqual(len(expected_urlpatterns), len(real_urlpatterns))
+
+        for i, expected in enumerate(expected_urlpatterns):
+            real = real_urlpatterns[i]
+            real_class_name = real.__class__.__name__
+            self.assertTrue(real_class_name.endswith(expected[0]))
+            # Django 2 vs. Django 1
+            if real_class_name == 'URLPattern':  # pragma: no cover
+                self.assertEqual(expected[1], str(real.pattern))
+                self.assertTrue(real.callback.startswith("<Mock name='{}' id=".format(expected[2])))
+            elif real_class_name == 'RegexURLPattern':  # pragma: no cover
+                self.assertEqual(expected[1], real.regex.pattern)
+                self.assertTrue(real.callback.startswith("<Mock name='{}' id=".format(expected[2])))
+            elif real_class_name == 'URLResolver':  # pragma: no cover
+                self.assertEqual(expected[1], str(real.pattern))
+                self.assertEqual(expected[2], real.urlconf_name.__name__)
+            elif real_class_name == 'RegexURLResolver':  # pragma: no cover
+                self.assertEqual(expected[1], real.regex.pattern)
+                self.assertEqual(expected[2], real.urlconf_name.__name__)
+            else:  # pragma: no cover
+                self.fail('Unknown urlpattern class: {}'.format(real_class_name))
diff --git a/src/django_deploy/tests/fake_app1/__init__.py b/src/django_deploy/tests/fake_app1/__init__.py
index e69de29..d42da90 100644
--- a/src/django_deploy/tests/fake_app1/__init__.py
+++ b/src/django_deploy/tests/fake_app1/__init__.py
@@ -0,0 +1 @@
+from . import django_deploy_hooks
diff --git a/src/django_deploy/tests/fake_app1/django_deploy_hooks.py b/src/django_deploy/tests/fake_app1/django_deploy_hooks.py
new file mode 100644
index 0000000..b71f195
--- /dev/null
+++ b/src/django_deploy/tests/fake_app1/django_deploy_hooks.py
@@ -0,0 +1,2 @@
+INSTALLED_APPS = ['django_deploy.tests.fake_app1']
+ROOT_URLCONF = '.urls'
diff --git a/src/django_deploy/tests/fake_app1/django_settings.py b/src/django_deploy/tests/fake_app1/django_settings.py
deleted file mode 100644
index fffc431..0000000
--- a/src/django_deploy/tests/fake_app1/django_settings.py
+++ /dev/null
@@ -1,5 +0,0 @@
-ADD_INSTALLED_APPS = ['django_deploy.tests.fake_app1']
-ADD_URLPATTERNS = [
-    {'type': 'include', 'pattern': '^fake1/', 'module': 'django_deploy.tests.fake_app1.urls'},
-    {'type': 'invalid', 'pattern': '^invalid/'},
-]
diff --git a/src/django_deploy/tests/fake_app2/django_deploy_hooks.py b/src/django_deploy/tests/fake_app2/django_deploy_hooks.py
new file mode 100644
index 0000000..b229122
--- /dev/null
+++ b/src/django_deploy/tests/fake_app2/django_deploy_hooks.py
@@ -0,0 +1,2 @@
+INSTALLED_APPS = ['django_deploy.tests.fake_app1', 'django_deploy.tests.fake_app2']
+ROOT_URLCONF = 'django_deploy.tests.fake_app2.urls'
diff --git a/src/django_deploy/tests/fake_app2/django_settings.py b/src/django_deploy/tests/fake_app2/django_settings.py
deleted file mode 100644
index 5bbce39..0000000
--- a/src/django_deploy/tests/fake_app2/django_settings.py
+++ /dev/null
@@ -1,5 +0,0 @@
-ADD_INSTALLED_APPS = ['django_deploy.tests.fake_app1', 'django_deploy.tests.fake_app2']
-ADD_URLPATTERNS = [
-    {'type': 'include', 'pattern': '^fake1/', 'module': 'django_deploy.tests.fake_app1.urls'},
-    {'type': 'include', 'pattern': '^fake2/', 'module': 'django_deploy.tests.fake_app2.urls'},
-]
diff --git a/src/django_deploy/tests/test_api.py b/src/django_deploy/tests/test_api.py
new file mode 100644
index 0000000..93c61bd
--- /dev/null
+++ b/src/django_deploy/tests/test_api.py
@@ -0,0 +1,204 @@
+import errno
+import os
+
+from ..api import DjangoProjectHooksConfig, DjangoProject
+from ..exceptions import DjangoDeployError
+
+from .base import DjangoDeployTestCase
+
+
+class DjangoProjectHooksConfigTestCase(DjangoDeployTestCase):
+    def test_init(self):
+        with self.assertRaises(AssertionError):
+            DjangoProjectHooksConfig()
+        with self.assertRaises(AssertionError):
+            DjangoProjectHooksConfig(project_dir='.', settings_dir='.')
+
+
+class DjangoProjectTestCase(DjangoDeployTestCase):
+    def setUp(self):
+        self._tmp_dir = str(self.tmpdir)
+
+    def test_init(self):
+        with self.assertRaises(TypeError):
+            DjangoProject()  # pylint: disable=no-value-for-parameter
+        # existing project dir
+        DjangoProject(self._tmp_dir)
+        # not existing project dir
+        project_dir = os.path.join(self._tmp_dir, 'new')
+        DjangoProject(project_dir)
+        # project dir is an existing file
+        os.mknod(project_dir)
+        DjangoProject(project_dir)
+
+    def test_create(self):
+        # the parent of the to-be-created project dir shall also not exist.
+        project_dir = os.path.join(self._tmp_dir, 'new', 'sub', 'sub')
+        project = DjangoProject(project_dir)
+        project.create()
+        self.assert_django_project(project_dir)
+        self.assert_django_deploy_hooks(project_dir)
+
+    def test_create_in_empty_dir(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        self.assert_django_project(project_dir)
+        self.assert_django_deploy_hooks(project_dir)
+
+    def test_create_in_project_dir(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        project = DjangoProject(project_dir)
+
+        try:
+            project.create()
+        except DjangoDeployError as e:
+            self.assertEqual(errno.EEXIST, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
+
+    def test_create_without_installing_hooks(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create(install_hooks=False)
+        self.assert_django_project(project_dir)
+        self.assert_no_django_deploy_hooks(project_dir)
+
+        try:
+            project.create(install_hooks=False)
+        except DjangoDeployError as e:
+            self.assertEqual(errno.EEXIST, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
+
+        try:
+            project.create()
+        except DjangoDeployError as e:
+            self.assertEqual(errno.EEXIST, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
+
+    def test_install_hooks(self):
+        project_dir = os.path.join(self._tmp_dir, 'new')
+        project = DjangoProject(project_dir)
+        try:
+            project.install_hooks()
+        except DjangoDeployError as e:
+            self.assertEqual(errno.ENOENT, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
+
+    def test_install_hooks_in_empty_dir(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        try:
+            project.install_hooks()
+        except DjangoDeployError as e:
+            self.assertEqual(errno.EISDIR, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
+
+    def test_install_hooks_in_project_dir(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create(install_hooks=False)
+        self.assert_django_project(project_dir)
+        project.install_hooks()
+        self.assert_django_deploy_hooks(project_dir)
+
+    def test_install_hooks_after_create(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        try:
+            project.install_hooks()
+        except DjangoDeployError as e:
+            self.assertEqual(errno.EEXIST, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
+
+    def test_install_app(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        project.install_app('django_deploy.tests.fake_app1')
+
+        installed_apps = [
+            'django_deploy.tests.fake_app1',
+        ]
+        self.assert_installed_apps(project_dir, installed_apps)
+
+    def test_install_apps(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        project.install_app('django_deploy.tests.fake_app1')
+        project.install_app('django_deploy.tests.fake_app1')
+        project.install_app('django_deploy.tests.fake_app2')
+
+        installed_apps = [
+            'django_deploy.tests.fake_app1',
+            'django_deploy.tests.fake_app2',
+        ]
+        self.assert_installed_apps(project_dir, installed_apps)
+
+    def test_install_nonexisting_app(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        try:
+            project.install_app('django_deploy.tests.fake_app0')
+        except DjangoDeployError as e:
+            self.assertEqual(errno.ENOPKG, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
+
+    def test_install_nonconforming_app(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        try:
+            project.install_app('django_deploy.tests.fake_app1', hooks_config_name='non_existing_submodule')
+        except DjangoDeployError as e:
+            self.assertEqual(errno.ENOENT, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
+
+    def test_mount_app(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        project.mount_app('django_deploy.tests.fake_app1', '')
+
+        expected_urlpatterns = [
+            ('URLResolver', '^/', 'django_deploy.tests.fake_app1.urls'),
+        ]
+        self.assert_urlpatterns(project_dir, expected_urlpatterns)
+
+    def test_mount_apps(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+        project.mount_app('django_deploy.tests.fake_app1', 'app1')
+        project.mount_app('django_deploy.tests.fake_app1', 'app1')
+        project.mount_app('django_deploy.tests.fake_app2', 'app2')
+
+        expected_urlpatterns = [
+            ('URLResolver', '^app1/', 'django_deploy.tests.fake_app1.urls'),
+            ('URLResolver', '^app2/', 'django_deploy.tests.fake_app2.urls'),
+        ]
+        self.assert_urlpatterns(project_dir, expected_urlpatterns)
+
+    def test_mount_unmountable_app(self):
+        project_dir = self._tmp_dir
+        project = DjangoProject(project_dir)
+        project.create()
+
+        try:
+            project.mount_app('django_deploy', '/')
+        except DjangoDeployError as e:
+            self.assertEqual(errno.ENOLINK, e.code)
+        else:  # pragma: no cover
+            self.fail('DjangoDeployError not raised')
diff --git a/src/django_deploy/tests/test_base_types.py b/src/django_deploy/tests/test_base_types.py
new file mode 100644
index 0000000..7546c1f
--- /dev/null
+++ b/src/django_deploy/tests/test_base_types.py
@@ -0,0 +1,40 @@
+import unittest
+
+from ..base_types import OrderedDict
+
+
+class OrderedDictTestCase(unittest.TestCase):
+    @staticmethod
+    def _create_filled_object(items):
+        obj = OrderedDict()
+        for key, value in items:
+            obj[key] = value
+        return obj
+
+    def setUp(self):
+        self._test_data = [
+            ('a', 'AA'),
+            ('c', 'CC'),
+            ('b', 'BB'),
+        ]
+        self._obj = self._create_filled_object(self._test_data)
+
+    def test_contain(self):
+        self.assertIn('a', self._obj)
+        self.assertIn('b', self._obj)
+        self.assertIn('c', self._obj)
+        self.assertNotIn('d', self._obj)
+
+    def test_len(self):
+        self.assertEqual(3, len(self._obj))
+
+    def test_del(self):
+        del self._obj['c']
+        self.assertEqual(2, len(self._obj))
+
+    def test_iter(self):
+        items = []
+        for key in self._obj:
+            items.append((key, self._obj[key]))
+
+        self.assertListEqual(self._test_data, items)
diff --git a/src/django_deploy/tests/test_config.py b/src/django_deploy/tests/test_hooks.py
similarity index 52%
rename from src/django_deploy/tests/test_config.py
rename to src/django_deploy/tests/test_hooks.py
index 8063bc4..2040525 100644
--- a/src/django_deploy/tests/test_config.py
+++ b/src/django_deploy/tests/test_hooks.py
@@ -1,11 +1,10 @@
 import unittest
-
 from django.conf.urls import url, include
 
-from ..config import get_installed_apps, get_urlpatterns, DeployedAppsConfig
+from ..hooks import get_installed_apps, get_urlpatterns
 
 
-class FunctionsTestCase(unittest.TestCase):
+class HooksTestCase(unittest.TestCase):
     def test_get_installed_apps(self):
         test_data_sets = [
             (__file__, ['fake_app1', 'fake_app2']),
@@ -29,26 +28,3 @@ class FunctionsTestCase(unittest.TestCase):
         for file_path, urlpatterns in test_data_sets:
             result = get_urlpatterns(file_path, urlpatterns)
             self.assertEqual(urlpatterns, result)
-
-
-class DeployedAppsConfigTestCase(unittest.TestCase):
-    def test_init_parameters(self):
-        with self.assertRaises(AssertionError):
-            DeployedAppsConfig()
-        with self.assertRaises(AssertionError):
-            DeployedAppsConfig(project_dir='.', settings_dir='.')
-
-    def test_len(self):
-        c = DeployedAppsConfig(settings_dir='.')
-        c['a'] = 'a'
-        c['b'] = 'b'
-        c['c'] = 'c'
-        self.assertEqual(3, len(c))
-
-    def test_del(self):
-        c = DeployedAppsConfig(settings_dir='.')
-        c['a'] = 'a'
-        c['b'] = 'b'
-        c['c'] = 'c'
-        del c['b']
-        self.assertEqual(2, len(c))
diff --git a/src/django_deploy/tests/test_program.py b/src/django_deploy/tests/test_program.py
index ae71d0f..687e7ab 100644
--- a/src/django_deploy/tests/test_program.py
+++ b/src/django_deploy/tests/test_program.py
@@ -1,173 +1,141 @@
-import importlib
 import os
-import sys
-import unittest
-import mock
-import pytest
 
 from ..config import DJANGO_SETTINGS_DIR
 from ..program import Program
 
+from .base import DjangoDeployTestCase
 
-class ProgramTestCase(unittest.TestCase):
-    @pytest.fixture(autouse=True)
-    def tmpdir(self, tmpdir):  # pylint: disable=method-hidden
-        self.tmpdir = tmpdir
-
-    def _assert_django_project(self, project_dir):
-        self.assertTrue(os.path.isdir(project_dir), 'no directory: {}'.format(project_dir))
-        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
-        self.assertTrue(os.path.isdir(settings_dir), 'no directory: {}'.format(settings_dir))
-        settings_file = os.path.join(settings_dir, 'settings.py')
-        self.assertTrue(os.path.isfile(settings_file), 'no file: {}'.format(settings_file))
-        manage_script = os.path.join(project_dir, 'manage.py')
-        self.assertTrue(os.path.isfile(manage_script), 'no file: {}'.format(manage_script))
-
-    def _assert_django_deploy_project(self, project_dir):
-        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
-        settings_file = os.path.join(settings_dir, 'settings.py')
-        urlconf_file = os.path.join(settings_dir, 'urls.py')
-        django_deploy_json = os.path.join(settings_dir, 'django_deploy.json')
-
-        self.assertTrue(os.path.isfile(django_deploy_json), 'no file: {}'.format(django_deploy_json))
-
-        with open(settings_file, 'r') as f:
-            needle = 'from django_deploy import get_installed_apps'
-            haystack = f.read()
-            self.assertIn(needle, haystack)
-
-        with open(urlconf_file, 'r') as f:
-            needle = 'from django_deploy import get_urlpatterns'
-            haystack = f.read()
-            self.assertIn(needle, haystack)
 
+class ProgramTestCase(DjangoDeployTestCase):
     def setUp(self):
         self._program = Program()
-        self._project_dir = os.path.join(str(self.tmpdir), 'django')
-        self._program(argv=['--create', self._project_dir])
+        self._tmp_dir = str(self.tmpdir)
 
-    def test_create_new_dir(self):
-        project_dir = os.path.join(str(self.tmpdir), 'new_dir')
+    def test_create(self):
+        project_dir = os.path.join(self._tmp_dir, 'new')
+        exitval = self._program(argv=['--create', project_dir])
+
+        self.assertEqual(os.EX_OK, exitval)
+        self.assert_django_project(project_dir)
+        self.assert_django_deploy_hooks(project_dir)
+
+    def test_create_in_empty_dir(self):
+        project_dir = self._tmp_dir
         exitval = self._program(argv=['-c', project_dir])
 
-        self.assertEqual(os.EX_OK, exitval, 'program() does not return os.EX_OK')
-        self._assert_django_project(project_dir)
-        self._assert_django_deploy_project(project_dir)
+        self.assertEqual(os.EX_OK, exitval)
+        self.assert_django_project(project_dir)
+        self.assert_django_deploy_hooks(project_dir)
 
-    def test_create_existing_empty_dir(self):
-        project_dir = os.path.join(str(self.tmpdir), 'empty_dir')
-        os.makedirs(project_dir)
+    def test_create_in_project_dir(self):
+        project_dir = self._tmp_dir
+        self._program(argv=['-c', project_dir])
         exitval = self._program(argv=['-c', project_dir])
+        self.assertNotEqual(os.EX_OK, exitval)
 
-        self.assertEqual(os.EX_OK, exitval, 'program() does not return os.EX_OK')
-        self._assert_django_project(project_dir)
-        self._assert_django_deploy_project(project_dir)
+    def test_create_without_hooks(self):
+        project_dir = self._tmp_dir
+        exitval = self._program(argv=['-c', '--no-install-hooks', project_dir])
 
-    def test_create_existing_project_dir(self):
-        exitval = self._program(argv=['-c', self._project_dir])
-        self.assertEqual(os.EX_NOPERM, exitval, 'program() does not return os.EX_NOPERM'
-                                                ' when project directory is not empty')
+        self.assertEqual(os.EX_OK, exitval)
+        self.assert_django_project(project_dir)
+        self.assert_no_django_deploy_hooks(project_dir)
 
-    def test_enable_django_deploy(self):
-        project_dir = os.path.join(str(self.tmpdir), 'pure_django')
-        os.makedirs(project_dir)
+    def test_install_hooks_without_project_dir(self):
+        project_dir = os.path.join(self._tmp_dir, 'new')
+        exitval = self._program(argv=['--install-hooks', project_dir])
+        self.assertNotEqual(os.EX_OK, exitval)
+
+        project_dir = os.path.join(self._tmp_dir)
+        exitval = self._program(argv=['--install-hooks', project_dir])
+        self.assertNotEqual(os.EX_OK, exitval)
+
+    def test_install_hooks_in_pure_django(self):
+        project_dir = self._tmp_dir
         cmd = 'django-admin startproject {name} {path}'.format(name=DJANGO_SETTINGS_DIR,
                                                                path=project_dir)
         os.system(cmd)
-        self._program(argv=['--enable', project_dir])
-        self._assert_django_deploy_project(project_dir)
+        exitval = self._program(argv=['--install-hooks', project_dir])
+        self.assertEqual(os.EX_OK, exitval)
+        self.assert_django_project(project_dir)
+        self.assert_django_deploy_hooks(project_dir)
 
-    def test_enable_django_deploy_twice(self):
-        exitval = self._program(argv=['-e', self._project_dir])
-        self.assertEqual(os.EX_NOPERM, exitval, 'program() does not return os.EX_NOPERM'
-                                                ' when django_deploy is already enabled')
-
-    def test_merge_installed_apps(self):
-        project_dir = self._project_dir
+    def test_install_hooks_twice(self):
+        project_dir = self._tmp_dir
+        self._program(argv=['-c', project_dir])
+        exitval = self._program(argv=['--install-hooks', project_dir])
+        self.assertEqual(os.EX_SOFTWARE, exitval)
 
+    def test_install_apps(self):
+        project_dir = self._tmp_dir
         argv = [
-            '-a', 'django_deploy',
-            '-a', 'django_deploy.tests.fake_app1',
+            '-c',
+            '--install-app', 'django_deploy.tests.fake_app1',
+            '--install-app', 'django_deploy.tests.fake_app1',
             '-a', 'django_deploy.tests.fake_app2',
-            project_dir]
-        self._program(argv=argv)
+            project_dir
+        ]
+        exitval = self._program(argv=argv)
+        self.assertEqual(os.EX_OK, exitval)
 
-        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
-        sys.path.insert(0, settings_dir)
-        settings = importlib.import_module('settings')
-        if sys.version_info.major == 2:  # pragma: no cover
-            reload(settings)  # pylint: disable=undefined-variable
-        else:  # pragma: no cover
-            importlib.reload(settings)  # pylint: disable=no-member
-        sys.path.pop(0)
-
-        expected_installed_apps = [
-            'django.contrib.admin',
-            'django.contrib.auth',
-            'django.contrib.contenttypes',
-            'django.contrib.sessions',
-            'django.contrib.messages',
-            'django.contrib.staticfiles',
+        installed_apps = [
             'django_deploy.tests.fake_app1',
             'django_deploy.tests.fake_app2',
         ]
 
-        self.assertListEqual(expected_installed_apps, settings.INSTALLED_APPS)
-
-    def test_merge_root_urlconf(self):
-        project_dir = self._project_dir
+        self.assert_installed_apps(project_dir, installed_apps)
 
+    def test_install_apps_with_error(self):
+        project_dir = self._tmp_dir
         argv = [
-            '-a', 'django_deploy',
+            '-c',
             '-a', 'django_deploy.tests.fake_app1',
+            '-a', 'django_deploy.tests.fake_app0',
             '-a', 'django_deploy.tests.fake_app2',
-            project_dir]
-        self._program(argv=argv)
+            project_dir
+        ]
+        exitval = self._program(argv=argv)
+        self.assertNotEqual(os.EX_OK, exitval)
 
-        sys.modules['django.contrib'] = mock.MagicMock(name='django.contrib')
-
-        settings_dir = os.path.join(project_dir, DJANGO_SETTINGS_DIR)
-        sys.path.insert(0, settings_dir)
-        root_urlconf = importlib.import_module('urls')
-        if sys.version_info.major == 2:  # pragma: no cover
-            reload(root_urlconf)  # pylint: disable=undefined-variable
-        else:  # pragma: no cover
-            importlib.reload(root_urlconf)  # pylint: disable=no-member
-        sys.path.pop(0)
-
-        # Django 2 vs Django 1
-        if hasattr(root_urlconf, 'path'):  # pragma: no cover
-            expected_urlpatterns = [
-                ('URLPattern', 'admin/', 'django.contrib.admin.site.urls'),
-            ]
-        else:  # pragma: no cover
-            expected_urlpatterns = [
-                ('URLPattern', '^admin/', 'django.contrib.admin.site.urls'),
-            ]
-        expected_urlpatterns += [
-            ('URLResolver', '^fake1/', 'django_deploy.tests.fake_app1.urls'),
-            ('URLResolver', '^fake2/', 'django_deploy.tests.fake_app2.urls'),
+        installed_apps = [
+            'django_deploy.tests.fake_app1',
+            'django_deploy.tests.fake_app2',
         ]
 
-        real_urlpatterns = root_urlconf.urlpatterns
-        self.assertEqual(len(expected_urlpatterns), len(real_urlpatterns))
+        self.assert_installed_apps(project_dir, installed_apps)
 
-        for i, expected in enumerate(expected_urlpatterns):
-            real = real_urlpatterns[i]
-            real_class_name = real.__class__.__name__
-            self.assertTrue(real_class_name.endswith(expected[0]))
-            # Django 2 vs. Django 1
-            if real_class_name == 'URLPattern':  # pragma: no cover
-                self.assertEqual(expected[1], str(real.pattern))
-                self.assertTrue(real.callback.startswith("<Mock name='{}' id=".format(expected[2])))
-            elif real_class_name == 'RegexURLPattern':  # pragma: no cover
-                self.assertEqual(expected[1], real.regex.pattern)
-                self.assertTrue(real.callback.startswith("<Mock name='{}' id=".format(expected[2])))
-            elif real_class_name == 'URLResolver':  # pragma: no cover
-                self.assertEqual(expected[1], str(real.pattern))
-                self.assertEqual(expected[2], real.urlconf_name.__name__)
-            elif real_class_name == 'RegexURLResolver':  # pragma: no cover
-                self.assertEqual(expected[1], real.regex.pattern)
-                self.assertEqual(expected[2], real.urlconf_name.__name__)
-            else:  # pragma: no cover
-                self.fail('Unknown urlpattern class: {}'.format(real_class_name))
+    def test_mount_apps(self):
+        project_dir = self._tmp_dir
+        argv = [
+            '-c',
+            '--mount-app', 'django_deploy.tests.fake_app1', 'app1',
+            '--mount-app', 'django_deploy.tests.fake_app1', 'app1',
+            '-m', 'django_deploy.tests.fake_app2', 'app2',
+            project_dir
+        ]
+        exitval = self._program(argv=argv)
+        self.assertEqual(os.EX_OK, exitval)
+
+        urlpatterns = [
+            ('URLResolver', '^app1/', 'django_deploy.tests.fake_app1.urls'),
+            ('URLResolver', '^app2/', 'django_deploy.tests.fake_app2.urls'),
+        ]
+        self.assert_urlpatterns(project_dir, urlpatterns)
+
+    def test_mount_apps_with_errors(self):
+        project_dir = self._tmp_dir
+        self._program(argv=['-c', project_dir])
+        argv = [
+            '-m', 'django_deploy.tests.fake_app1', 'app1',
+            '-m', 'django_deploy.tests.fake_app0', 'app0',
+            '-m', 'django_deploy.tests.fake_app2', 'app2',
+            project_dir
+        ]
+        exitval = self._program(argv=argv)
+        self.assertNotEqual(os.EX_OK, exitval)
+
+        patterns = [
+            ('URLResolver', '^app1/', 'django_deploy.tests.fake_app1.urls'),
+            ('URLResolver', '^app2/', 'django_deploy.tests.fake_app2.urls'),
+        ]
+        self.assert_urlpatterns(project_dir, patterns)
diff --git a/src/django_deploy/version.py b/src/django_deploy/version.py
index 8084d01..dcd9646 100644
--- a/src/django_deploy/version.py
+++ b/src/django_deploy/version.py
@@ -1 +1 @@
-VERSION = '0.1.dev0'
+VERSION = '0.2.dev0'