update tests/unit/test_base64_decoder.py

tests/unit/test_base64_decoder.py

@@ -0,0 +1,36 @@
+import pytest
+import base64
+from app.utils.base64_decoder import SubscriptionDecoder
+
+
+class TestBase64Decoder:
+    def test_decode_simple_base64(self):
+        original = "vmess://test123\nvless://test456"
+        encoded = base64.b64encode(original.encode()).decode()
+
+        decoded = SubscriptionDecoder.decode(encoded)
+        assert decoded == original
+
+    def test_decode_with_padding(self):
+        original = "proxy list"
+        encoded_with = base64.b64encode(original.encode()).decode()
+        encoded_without = encoded_with.rstrip("=")
+
+        assert SubscriptionDecoder.decode(encoded_with) == original
+        assert SubscriptionDecoder.decode(encoded_without) == original
+
+    def test_decode_multiline(self):
+        original = "line1\nline2\nline3"
+        encoded = base64.b64encode(original.encode()).decode()
+
+        decoded = SubscriptionDecoder.decode(encoded)
+        assert decoded.count("\n") == 2
+        assert "line1" in decoded
+
+    def test_invalid_base64(self):
+        with pytest.raises(ValueError):
+            SubscriptionDecoder.decode("not!@#$%valid&*base64")
+
+    def test_empty_string(self):
+        result = SubscriptionDecoder.decode("")
+        assert result == ""