diff --git a/tests/test_memorycache.py b/tests/test_memorycache.py
new file mode 100644
index 0000000..ba97caf
--- /dev/null
+++ b/tests/test_memorycache.py
@@ -0,0 +1,36 @@
+import asyncio
+
+from imoog.cache.memorycache import InMemoryCache
+
+
+def test_cache_round_trip_and_delete():
+    async def exercise_cache():
+        cache = InMemoryCache()
+        connection = await cache.connect(max_cache_size=10)
+
+        assert connection == {}
+        assert await cache.get("missing") is None
+
+        await cache.set("logo", b"image data", "image/png")
+        assert await cache.get("logo") == (b"image data", "image/png")
+        assert await cache.delete("logo") is True
+        assert await cache.get("logo") is None
+        assert await cache.delete("logo") is False
+
+    asyncio.run(exercise_cache())
+
+
+def test_cleanup_removes_cached_images_and_mime_metadata():
+    async def exercise_cache():
+        cache = InMemoryCache()
+        await cache.connect(max_cache_size=10)
+        await cache.set("first", b"first image", "image/jpeg")
+        await cache.set("second", b"second image", "image/webp")
+
+        await cache.cleanup()
+
+        assert cache._connection == {}
+        assert await cache.get("first") is None
+        assert await cache.get("second") is None
+
+    asyncio.run(exercise_cache())
diff --git a/tests/test_opengraph.py b/tests/test_opengraph.py
new file mode 100644
index 0000000..a8b8625
--- /dev/null
+++ b/tests/test_opengraph.py
@@ -0,0 +1,25 @@
+from imoog.opengraph import generate_opengraph_tag, generate_tags_from_dict
+
+
+def test_generate_opengraph_tag_adds_namespace_and_content():
+    assert generate_opengraph_tag("title", "Imoog CDN") == (
+        '<meta property="og:title" content="Imoog CDN" />'
+    )
+
+
+def test_generate_tags_from_dict_preserves_property_order():
+    properties = {
+        "title": "Imoog CDN",
+        "description": "A database-backed CDN",
+        "type": "website",
+    }
+
+    assert generate_tags_from_dict(properties) == [
+        '<meta property="og:title" content="Imoog CDN" />',
+        '<meta property="og:description" content="A database-backed CDN" />',
+        '<meta property="og:type" content="website" />',
+    ]
+
+
+def test_generate_tags_from_empty_dict_returns_empty_list():
+    assert generate_tags_from_dict({}) == []