Add Binance Testnet exchange gateway

tests/test_config.py

@@ -75,3 +75,66 @@ def test_rejects_missing_prompts_file(tmp_path: Path):
     path.write_text(CONFIG, encoding="utf-8")
     with pytest.raises(ConfigError, match="Prompts file not found"):
         load_config(path)
+
+
+def test_legacy_bybit_config_selects_bybit(tmp_path: Path):
+    config = load_config(write_config(tmp_path))
+    assert config.exchange.provider == "bybit"
+    assert config.bybit is not None
+    assert config.binance is None
+
+
+def test_binance_config_only_requires_binance_credentials(tmp_path: Path):
+    content = CONFIG.replace(
+        '[bybit]\napi_key = "bybit-key"\napi_secret = "bybit-secret"\n',
+        '''[exchange]
+provider = "binance"
+[binance.spot]
+api_key = "spot-key"
+api_secret = "spot-secret"
+[binance.usdm]
+api_key = "usdm-key"
+api_secret = "usdm-secret"
+''',
+    )
+    config = load_config(write_config(tmp_path, content))
+    assert config.exchange.provider == "binance"
+    assert config.bybit is None
+    assert config.binance is not None
+    assert config.binance.spot.api_key == "spot-key"
+
+
+def test_binance_rejects_endpoint_override(tmp_path: Path):
+    content = CONFIG.replace(
+        '[bybit]\napi_key = "bybit-key"\napi_secret = "bybit-secret"\n',
+        '''[exchange]
+provider = "binance"
+[binance]
+base_url = "https://api.binance.com"
+[binance.spot]
+api_key = "spot-key"
+api_secret = "spot-secret"
+[binance.usdm]
+api_key = "usdm-key"
+api_secret = "usdm-secret"
+''',
+    )
+    with pytest.raises(ConfigError, match="fixed to Testnet"):
+        load_config(write_config(tmp_path, content))
+
+
+def test_binance_requires_both_selected_wallet_credentials(tmp_path: Path):
+    content = CONFIG.replace(
+        '[bybit]\napi_key = "bybit-key"\napi_secret = "bybit-secret"\n',
+        '''[exchange]
+provider = "binance"
+[binance.spot]
+api_key = "spot-key"
+api_secret = "spot-secret"
+[binance.usdm]
+api_key = "replace-me"
+api_secret = "replace-me"
+''',
+    )
+    with pytest.raises(ConfigError, match="placeholder"):
+        load_config(write_config(tmp_path, content))