Add tests

test/test_patcher.py

@@ -0,0 +1,35 @@
+from spotdl import patcher
+import pafy
+
+import pytest
+
+patcher.patch_pafy()
+
+class TestPafyContentAvailable:
+    pass
+
+
+class TestMethodAssignment:
+    def test_pafy_getbestthumb(self):
+        pafy.backend_shared.BasePafy.getbestthumb == patcher._getbestthumb
+
+
+class TestMethodCalls:
+    @pytest.fixture(scope="module")
+    def content_fixture(self):
+        content = pafy.new("http://youtube.com/watch?v=3nQNiWdeH2Q")
+        return content
+
+    def test_pafy_getbestthumb(self, content_fixture):
+        thumbnail = patcher._getbestthumb(content_fixture)
+        assert thumbnail == "https://i.ytimg.com/vi/3nQNiWdeH2Q/maxresdefault.jpg"
+
+    def test_pafy_getbestthumb_without_ytdl(self, content_fixture):
+        content_fixture._ydl_info["thumbnails"][0]["url"] = None
+        thumbnail = patcher._getbestthumb(content_fixture)
+        assert thumbnail == "https://i.ytimg.com/vi/3nQNiWdeH2Q/maxresdefault.jpg"
+
+
+    def test_pafy_content_available(self):
+        TestPafyContentAvailable._content_available = patcher._content_available
+        assert TestPafyContentAvailable()._content_available("https://youtube.com/")