fix: 修正 conversion 代理路径和错误边界

backend/internal/conversion/engine_adapter_test.go

@@ -0,0 +1,63 @@
+package conversion_test
+
+import (
+	"testing"
+
+	"nex/backend/internal/conversion"
+	"nex/backend/internal/conversion/anthropic"
+	"nex/backend/internal/conversion/openai"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap"
+)
+
+func TestConvertHttpRequest_SameProtocolUsesAdapterBuildURL(t *testing.T) {
+	tests := []struct {
+		name             string
+		adapter          conversion.ProtocolAdapter
+		clientProtocol   string
+		providerProtocol string
+		baseURL          string
+		nativePath       string
+		expectedURL      string
+		body             []byte
+	}{
+		{
+			name:             "openai base url includes version path",
+			adapter:          openai.NewAdapter(),
+			clientProtocol:   "openai",
+			providerProtocol: "openai",
+			baseURL:          "http://example.com/v1",
+			nativePath:       "/chat/completions",
+			expectedURL:      "http://example.com/v1/chat/completions",
+			body:             []byte(`{"model":"gpt-4","messages":[]}`),
+		},
+		{
+			name:             "anthropic native path keeps v1",
+			adapter:          anthropic.NewAdapter(),
+			clientProtocol:   "anthropic",
+			providerProtocol: "anthropic",
+			baseURL:          "http://example.com",
+			nativePath:       "/v1/messages",
+			expectedURL:      "http://example.com/v1/messages",
+			body:             []byte(`{"model":"claude","messages":[]}`),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			registry := conversion.NewMemoryRegistry()
+			engine := conversion.NewConversionEngine(registry, zap.NewNop())
+			require.NoError(t, registry.Register(tt.adapter))
+
+			out, err := engine.ConvertHttpRequest(conversion.HTTPRequestSpec{
+				URL:    tt.nativePath,
+				Method: "POST",
+				Body:   tt.body,
+			}, tt.clientProtocol, tt.providerProtocol, conversion.NewTargetProvider(tt.baseURL, "key", "upstream-model"))
+			require.NoError(t, err)
+			assert.Equal(t, tt.expectedURL, out.URL)
+		})
+	}
+}