fix: 收敛 Claude Code 探测拦截并补齐回归测试

backend/internal/handler/gateway_handler_intercept_test.go

@@ -0,0 +1,65 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDetectInterceptType_MaxTokensOneHaikuRequiresClaudeCodeClient(t *testing.T) {
+	body := []byte(`{"messages":[{"role":"user","content":[{"type":"text","text":"hello"}]}]}`)
+
+	notClaudeCode := detectInterceptType(body, "claude-haiku-4-5", 1, false, false)
+	require.Equal(t, InterceptTypeNone, notClaudeCode)
+
+	isClaudeCode := detectInterceptType(body, "claude-haiku-4-5", 1, false, true)
+	require.Equal(t, InterceptTypeMaxTokensOneHaiku, isClaudeCode)
+}
+
+func TestDetectInterceptType_SuggestionModeUnaffected(t *testing.T) {
+	body := []byte(`{
+		"messages":[{
+			"role":"user",
+			"content":[{"type":"text","text":"[SUGGESTION MODE:foo]"}]
+		}],
+		"system":[]
+	}`)
+
+	got := detectInterceptType(body, "claude-sonnet-4-5", 256, false, false)
+	require.Equal(t, InterceptTypeSuggestionMode, got)
+}
+
+func TestSendMockInterceptResponse_MaxTokensOneHaiku(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	rec := httptest.NewRecorder()
+	ctx, _ := gin.CreateTestContext(rec)
+
+	sendMockInterceptResponse(ctx, "claude-haiku-4-5", InterceptTypeMaxTokensOneHaiku)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+
+	var response map[string]any
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &response))
+	require.Equal(t, "max_tokens", response["stop_reason"])
+
+	id, ok := response["id"].(string)
+	require.True(t, ok)
+	require.True(t, strings.HasPrefix(id, "msg_bdrk_"))
+
+	content, ok := response["content"].([]any)
+	require.True(t, ok)
+	require.NotEmpty(t, content)
+
+	firstBlock, ok := content[0].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, "#", firstBlock["text"])
+
+	usage, ok := response["usage"].(map[string]any)
+	require.True(t, ok)
+	require.Equal(t, float64(1), usage["output_tokens"])
+}