test: add tests for extracted parse_api_proxies

Cover valid entries, invalid proto/port, missing keys, and
mixed valid/invalid input.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_config.py

@@ -2,7 +2,7 @@
 
 import pytest
 
-from s5p.config import ChainHop, Config, load_config, parse_proxy_url
+from s5p.config import ChainHop, Config, load_config, parse_api_proxies, parse_proxy_url
 
 
 class TestParseProxyUrl:
@@ -65,6 +65,57 @@ class TestChainHop:
         assert str(hop) == "http://u@proxy:8080"
 
 
+class TestParseApiProxies:
+    """Test API response proxy parsing."""
+
+    def test_valid_entries(self):
+        data = {
+            "proxies": [
+                {"proto": "socks5", "proxy": "1.2.3.4:1080"},
+                {"proto": "http", "proxy": "5.6.7.8:8080"},
+            ],
+        }
+        result = parse_api_proxies(data)
+        assert len(result) == 2
+        assert result[0] == ChainHop(proto="socks5", host="1.2.3.4", port=1080)
+        assert result[1] == ChainHop(proto="http", host="5.6.7.8", port=8080)
+
+    def test_skips_invalid_proto(self):
+        data = {"proxies": [{"proto": "ftp", "proxy": "1.2.3.4:21"}]}
+        assert parse_api_proxies(data) == []
+
+    def test_skips_missing_proto(self):
+        data = {"proxies": [{"proxy": "1.2.3.4:1080"}]}
+        assert parse_api_proxies(data) == []
+
+    def test_skips_missing_colon(self):
+        data = {"proxies": [{"proto": "socks5", "proxy": "no-port"}]}
+        assert parse_api_proxies(data) == []
+
+    def test_skips_bad_port(self):
+        data = {"proxies": [{"proto": "socks5", "proxy": "1.2.3.4:abc"}]}
+        assert parse_api_proxies(data) == []
+
+    def test_empty_proxies(self):
+        assert parse_api_proxies({"proxies": []}) == []
+
+    def test_missing_proxies_key(self):
+        assert parse_api_proxies({}) == []
+
+    def test_mixed_valid_invalid(self):
+        data = {
+            "proxies": [
+                {"proto": "socks5", "proxy": "1.2.3.4:1080"},
+                {"proto": "ftp", "proxy": "bad:21"},
+                {"proto": "socks4", "proxy": "5.6.7.8:1080"},
+            ],
+        }
+        result = parse_api_proxies(data)
+        assert len(result) == 2
+        assert result[0].proto == "socks5"
+        assert result[1].proto == "socks4"
+
+
 class TestConfig:
     """Test Config defaults."""