diff --git a/tests/test_memorycache.py b/tests/test_memorycache.py
new file mode 100644
index 0000000..dc4e506
--- /dev/null
+++ b/tests/test_memorycache.py
@@ -0,0 +1,47 @@
+import asyncio
+
+from imoog.cache.memorycache import InMemoryCache
+
+
+def run(coroutine):
+    return asyncio.run(coroutine)
+
+
+def test_set_and_get_round_trip_image_and_mime():
+    cache = InMemoryCache()
+    run(cache.connect(max_cache_size=10))
+
+    run(cache.set(key="IMAGE123", image=b"image bytes", mime="image/png"))
+
+    assert run(cache.get("IMAGE123")) == (b"image bytes", "image/png")
+
+
+def test_get_returns_none_when_image_or_mime_is_missing():
+    cache = InMemoryCache()
+    connection = run(cache.connect(max_cache_size=10))
+    connection["image-only"] = b"image bytes"
+    connection["mime-only__mime__"] = "image/png"
+
+    assert run(cache.get("unknown")) is None
+    assert run(cache.get("image-only")) is None
+    assert run(cache.get("mime-only")) is None
+
+
+def test_delete_removes_image_and_mime_and_reports_result():
+    cache = InMemoryCache()
+    run(cache.connect(max_cache_size=10))
+    run(cache.set(key="IMAGE123", image=b"image bytes", mime="image/png"))
+
+    assert run(cache.delete("IMAGE123")) is True
+    assert run(cache.get("IMAGE123")) is None
+    assert run(cache.delete("IMAGE123")) is False
+
+
+def test_cleanup_clears_all_cached_values():
+    cache = InMemoryCache()
+    connection = run(cache.connect(max_cache_size=10))
+    run(cache.set(key="IMAGE123", image=b"image bytes", mime="image/png"))
+
+    run(cache.cleanup())
+
+    assert connection == {}
diff --git a/tests/test_opengraph.py b/tests/test_opengraph.py
new file mode 100644
index 0000000..4207b3b
--- /dev/null
+++ b/tests/test_opengraph.py
@@ -0,0 +1,28 @@
+from imoog.opengraph import generate_opengraph_tag, generate_tags_from_dict
+
+
+def test_generate_opengraph_tag_prefixes_property_and_preserves_content():
+    tag = generate_opengraph_tag("image", "https://cdn.example/image.png?a=1&b=2")
+
+    assert tag == (
+        '<meta property="og:image" '
+        'content="https://cdn.example/image.png?a=1&b=2" />'
+    )
+
+
+def test_generate_tags_from_dict_preserves_input_order():
+    properties = {
+        "title": "Example title",
+        "description": "Example description",
+        "type": "website",
+    }
+
+    assert generate_tags_from_dict(properties) == [
+        '<meta property="og:title" content="Example title" />',
+        '<meta property="og:description" content="Example description" />',
+        '<meta property="og:type" content="website" />',
+    ]
+
+
+def test_generate_tags_from_empty_dict_returns_empty_list():
+    assert generate_tags_from_dict({}) == []