add _templates.get_template_engine tests (#106)

Author: joshuadavidthomas

tests/test_templates.py

@@ -0,0 +1,125 @@
+from __future__ import annotations
+
+import pytest
+from django.conf import settings
+from django.core.exceptions import ImproperlyConfigured
+from django.test import override_settings
+
+from django_simple_nav._templates import get_template_engine
+
+
+def test_get_template_engine():
+    engine = get_template_engine()
+
+    assert engine.name in settings.TEMPLATES[0].get("BACKEND")
+
+
+@override_settings(TEMPLATES=[])
+def test_get_template_engine_no_engine():
+    with pytest.raises(ImproperlyConfigured):
+        get_template_engine()
+
+
+@override_settings(
+    TEMPLATES=[
+        {
+            "BACKEND": "django.template.backends.django.DjangoTemplates",
+        },
+        {
+            "BACKEND": "django.template.backends.jinja2.Jinja2",
+        },
+    ]
+)
+@pytest.mark.parametrize(
+    "templates,expected",
+    [
+        (
+            [
+                {
+                    "BACKEND": "django.template.backends.django.DjangoTemplates",
+                },
+                {
+                    "BACKEND": "django.template.backends.jinja2.Jinja2",
+                },
+            ],
+            "django",
+        ),
+        (
+            [
+                {
+                    "BACKEND": "django.template.backends.jinja2.Jinja2",
+                },
+                {
+                    "BACKEND": "django.template.backends.django.DjangoTemplates",
+                },
+            ],
+            "jinja2",
+        ),
+    ],
+)
+def test_get_template_engine_multiple(templates, expected, caplog):
+    with override_settings(TEMPLATES=templates):
+        with caplog.at_level("WARNING"):
+            engine = get_template_engine()
+
+    assert engine.name == expected
+    assert "Multiple `BACKEND` defined for a template engine." in caplog.text
+
+
+@pytest.mark.parametrize(
+    "using,expected",
+    [
+        ("django", "django"),
+        ("django2", "django2"),
+        ("jinja2", "jinja2"),
+    ],
+)
+@override_settings(
+    TEMPLATES=[
+        {
+            "BACKEND": "django.template.backends.django.DjangoTemplates",
+        },
+        {
+            "BACKEND": "django.template.backends.django.DjangoTemplates",
+            "NAME": "django2",
+        },
+        {
+            "BACKEND": "django.template.backends.jinja2.Jinja2",
+        },
+    ]
+)
+def test_get_template_engine_using(using, expected):
+    engine = get_template_engine(using)
+
+    assert engine.name == expected
+
+
+@pytest.mark.parametrize(
+    "app_setting,expected",
+    [
+        ("django.template.backends.django.DjangoTemplates", "django"),
+        ("django.template.backends.jinja2.Jinja2", "jinja2"),
+    ],
+)
+def test_get_template_engine_app_setting(app_setting, expected):
+    with override_settings(
+        DJANGO_SIMPLE_NAV={"TEMPLATE_BACKEND": app_setting},
+        TEMPLATES=[
+            {
+                "BACKEND": app_setting,
+            },
+        ],
+    ):
+        engine = get_template_engine()
+
+    assert engine.name == expected
+
+
+@override_settings(
+    DJANGO_SIMPLE_NAV={"TEMPLATE_BACKEND": "invalid"},
+)
+def test_get_template_engine_app_setting_invalid():
+    with pytest.raises(ImproperlyConfigured) as exc_info:
+        get_template_engine()
+
+        assert "Invalid `TEMPLATE_BACKEND` for a template engine" in exc_info