tests: Add back tests from mkdocstrings

Author: pawamoy

tests/test_themes.py

@@ -0,0 +1,40 @@
+"""Tests for the different themes we claim to support."""
+
+import sys
+
+import pytest
+
+
+@pytest.mark.parametrize(
+    "plugin",
+    [
+        {"theme": "mkdocs"},
+        {"theme": "readthedocs"},
+        {"theme": {"name": "material"}},
+    ],
+    indirect=["plugin"],
+)
+@pytest.mark.parametrize(
+    "module",
+    [
+        "mkdocstrings.extension",
+        "mkdocstrings.inventory",
+        "mkdocstrings.loggers",
+        "mkdocstrings.plugin",
+        "mkdocstrings.handlers.base",
+        "mkdocstrings.handlers.python",
+        "mkdocstrings.handlers.rendering",
+    ],
+)
+@pytest.mark.skipif(sys.version_info < (3, 7), reason="material is not installed on Python 3.6")
+def test_render_themes_templates(module, plugin):
+    """Test rendering of a given theme's templates.
+
+    Parameters:
+        module: The module to load and render (parametrized).
+        plugin: The plugin instance (parametrized fixture).
+    """
+    handler = plugin.handlers.get_handler("python")
+    handler.renderer._update_env(plugin.md, plugin.handlers._config)  # noqa: WPS437
+    data = handler.collector.collect(module, {})
+    handler.renderer.render(data, {})