tests: add tests for snapcraft source

tests/test_snapcraft.py

@@ -0,0 +1,28 @@
+# MIT licensed
+# Copyright (c) 2025 Maxim Slipenko <maxim@slipenko.com>, et al.
+
+import pytest
+pytestmark = [pytest.mark.asyncio, pytest.mark.needs_net]
+
+async def test_snapcraft(get_version):
+    assert await get_version("test", {
+        "source": "snapcraft",
+        "snap": "test-snapd-public",
+        "channel": "edge",
+    }) == "2.0"
+
+async def test_snapcraft_non_existent_snap(get_version):
+    with pytest.raises(RuntimeError, match='Failed to request snap info for not-existent-snap'):
+        assert await get_version("test", {
+            "source": "snapcraft",
+            "snap": "not-existent-snap",
+            "channel": "stable",
+        })
+
+async def test_snapcraft_non_existent_channel(get_version):
+    with pytest.raises(RuntimeError, match='Failed to find version for test-snapd-public'):
+        assert await get_version("test", {
+            "source": "snapcraft",
+            "snap": "test-snapd-public",
+            "channel": "non-existent-channel",
+        })