diff --git a/dav_base/templates/dav_base/tests/include_if_exist.html b/dav_base/templates/dav_base/tests/include_if_exist.html
new file mode 100644
index 0000000..22eefd4
--- /dev/null
+++ b/dav_base/templates/dav_base/tests/include_if_exist.html
@@ -0,0 +1,6 @@
+{# This template is used by software tests #}{% load dav_base %}
+--{% include_if_exist './includes/include_missing.html' %}--
+--{% include_if_exist './includes/include_missing.html' default 'dav_base/tests/includes/include_default.html' %}--
+--{% include_if_exist './includes/include_optional.html' %}--
+--{% include_if_exist './includes/include_optional.html' default 'dav_base/tests/includes/include_default.html' %}--
+--{% include_if_exist './includes/include_with_missing_include.html' %}--
diff --git a/dav_base/templates/dav_base/tests/include_if_exist_default_missing.html b/dav_base/templates/dav_base/tests/include_if_exist_default_missing.html
new file mode 100644
index 0000000..62da605
--- /dev/null
+++ b/dav_base/templates/dav_base/tests/include_if_exist_default_missing.html
@@ -0,0 +1,2 @@
+{# This template is used by software tests #}{% load dav_base %}
+--{% include_if_exist './includes/include_missing.html' default './includes/include_missing.html' %}--
diff --git a/dav_base/templates/dav_base/tests/include_if_exist_default_without_argument.html b/dav_base/templates/dav_base/tests/include_if_exist_default_without_argument.html
new file mode 100644
index 0000000..8f52bc4
--- /dev/null
+++ b/dav_base/templates/dav_base/tests/include_if_exist_default_without_argument.html
@@ -0,0 +1,3 @@
+{% load dav_base %}
+This template is used by the automatic software tests.
+--{% include_if_exist './includes/include_optional.html' default %}--
diff --git a/dav_base/templates/dav_base/tests/include_if_exist_with_unexpected_argument.html b/dav_base/templates/dav_base/tests/include_if_exist_with_unexpected_argument.html
new file mode 100644
index 0000000..d3e5370
--- /dev/null
+++ b/dav_base/templates/dav_base/tests/include_if_exist_with_unexpected_argument.html
@@ -0,0 +1,3 @@
+{% load dav_base %}
+This template is used by the automatic software tests.
+--{% include_if_exist './includes/include_optional.html' 'bogus' %}--
diff --git a/dav_base/templates/dav_base/tests/include_if_exist_without_argument.html b/dav_base/templates/dav_base/tests/include_if_exist_without_argument.html
new file mode 100644
index 0000000..f9735f5
--- /dev/null
+++ b/dav_base/templates/dav_base/tests/include_if_exist_without_argument.html
@@ -0,0 +1,3 @@
+{% load dav_base %}
+This template is used by the automatic software tests.
+--{% include_if_exist %}--
diff --git a/dav_base/templates/dav_base/tests/includes/include_default.html b/dav_base/templates/dav_base/tests/includes/include_default.html
new file mode 100644
index 0000000..32d18b0
--- /dev/null
+++ b/dav_base/templates/dav_base/tests/includes/include_default.html
@@ -0,0 +1 @@
+{# This template is used by software tests #}DEFAULT INCLUDED HTML
\ No newline at end of file
diff --git a/dav_base/templates/dav_base/tests/includes/include_optional.html b/dav_base/templates/dav_base/tests/includes/include_optional.html
new file mode 100644
index 0000000..8d946a6
--- /dev/null
+++ b/dav_base/templates/dav_base/tests/includes/include_optional.html
@@ -0,0 +1 @@
+{# This template is used by software tests #}OPTIONAL INCLUDED HTML
\ No newline at end of file
diff --git a/dav_base/templates/dav_base/tests/includes/include_with_missing_include.html b/dav_base/templates/dav_base/tests/includes/include_with_missing_include.html
new file mode 100644
index 0000000..8694ad9
--- /dev/null
+++ b/dav_base/templates/dav_base/tests/includes/include_with_missing_include.html
@@ -0,0 +1,2 @@
+{# This template is used by software tests #}{% load dav_base %}
+--{% include './include_missing.html' %}--
diff --git a/dav_base/tests/test_templatetags.py b/dav_base/tests/test_templatetags.py
new file mode 100644
index 0000000..1cba8a1
--- /dev/null
+++ b/dav_base/tests/test_templatetags.py
@@ -0,0 +1,61 @@
+from django.template.exceptions import TemplateSyntaxError, TemplateDoesNotExist
+from django.template.loader import get_template
+from django.test import SimpleTestCase
+
+
+class TemplateTagsTestCase(SimpleTestCase):
+    def test_include_if_exist_without_argument(self):
+        template_name = 'dav_base/tests/include_if_exist_without_argument.html'
+        with self.assertRaises(TemplateSyntaxError):
+            get_template(template_name)
+
+    def test_include_if_exist_with_unexpected_argument(self):
+        template_name = 'dav_base/tests/include_if_exist_with_unexpected_argument.html'
+        with self.assertRaises(TemplateSyntaxError):
+            get_template(template_name)
+
+    def test_include_if_exist_default_without_argument(self):
+        template_name = 'dav_base/tests/include_if_exist_default_without_argument.html'
+        with self.assertRaises(TemplateSyntaxError):
+            get_template(template_name)
+
+    def test_include_if_exist_default_missing(self):
+        template_name = 'dav_base/tests/include_if_exist_default_missing.html'
+        with self.settings(DEBUG=True):
+            with self.assertRaises(TemplateDoesNotExist):
+                template = get_template(template_name)
+                template.render()
+
+    def test_include_if_exist(self):
+        template_name = 'dav_base/tests/include_if_exist.html'
+        template = get_template(template_name)
+
+        content = template.render()
+        expected_content = """
+----
+--DEFAULT INCLUDED HTML--
+--OPTIONAL INCLUDED HTML--
+--OPTIONAL INCLUDED HTML--
+--
+----
+--
+"""
+
+        self.assertEqual(content, expected_content)
+
+    def test_include_if_exist_while_debug(self):
+        template_name = 'dav_base/tests/include_if_exist.html'
+
+        with self.settings(DEBUG=True):
+            template = get_template(template_name)
+
+            content = template.render()
+            expected_content = """
+----
+--DEFAULT INCLUDED HTML--
+--OPTIONAL INCLUDED HTML--
+--OPTIONAL INCLUDED HTML--
+----
+"""
+
+            self.assertEqual(content, expected_content)