diff --git a/test_app.py b/test_app.py
new file mode 100644
index 0000000..683d39a
--- /dev/null
+++ b/test_app.py
@@ -0,0 +1,42 @@
+import pytest
+import asyncio
+from aioresponses import aioresponses
+from app import fetch_image, DERPYBOORU_API_SEARCH, DERPIBOORU_TOKEN
+
+@pytest.mark.asyncio
+async def test_fetch_image_found():
+    # Мокаем API-ответ с одним изображением
+    tags = ["safe", "pony"]
+    with aioresponses() as m:
+        m.get(
+            f"{DERPYBOORU_API_SEARCH}",
+            payload={
+                "images": [
+                    {
+                        "representations": {"full": "https://test.img/full.png"},
+                        "uploader": "tester",
+                        "view_url": "https://derpibooru.org/images/1",
+                        "tags": ["pony", "cute"]
+                    }
+                ]
+            }
+        )
+        async with asyncio.get_event_loop().run_until_complete:
+            result = await fetch_image(tags)
+        assert result is not None
+        url, author, source, img_tags = result
+        assert url == "https://test.img/full.png"
+        assert author == "tester"
+        assert source == "https://derpibooru.org/images/1"
+        assert "pony" in img_tags
+
+@pytest.mark.asyncio
+async def test_fetch_image_not_found():
+    tags = ["nonexistenttag123"]
+    with aioresponses() as m:
+        m.get(
+            f"{DERPYBOORU_API_SEARCH}",
+            payload={"images": []}
+        )
+        result = await fetch_image(tags)
+        assert result is None