Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/internal/service/content_moderation_keyword_matcher_test.go

@@ -0,0 +1,59 @@
+package service
+
+import (
+	"math/rand"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestContentModerationKeywordMatcherMatchesLegacyBehavior(t *testing.T) {
+	tests := []struct {
+		name     string
+		text     string
+		keywords []string
+	}{
+		{name: "miss", text: "clean prompt", keywords: []string{"blocked", "secret"}},
+		{name: "case insensitive", text: "contains SECRET value", keywords: []string{"secret"}},
+		{name: "configured order wins", text: "early appears before later", keywords: []string{"later", "early"}},
+		{name: "overlap uses configured order", text: "abc", keywords: []string{"bc", "abc"}},
+		{name: "unicode", text: "这里包含敏感词和世界", keywords: []string{"世界", "敏感词"}},
+		{name: "duplicates", text: "duplicate", keywords: []string{"duplicate", "DUPLICATE"}},
+		{name: "empty entries", text: "blocked", keywords: []string{"", "blocked"}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			wantKeyword, wantHit := matchBlockedKeyword(tt.text, tt.keywords)
+			gotKeyword, gotHit := newContentModerationKeywordMatcher(tt.keywords).Match(tt.text)
+			require.Equal(t, wantHit, gotHit)
+			require.Equal(t, wantKeyword, gotKeyword)
+		})
+	}
+}
+
+func TestContentModerationKeywordMatcherRandomizedParity(t *testing.T) {
+	rng := rand.New(rand.NewSource(20260714))
+	const alphabet = "abcXYZ"
+	for iteration := 0; iteration < 1000; iteration++ {
+		keywords := make([]string, 1+rng.Intn(30))
+		for index := range keywords {
+			length := 1 + rng.Intn(8)
+			var value strings.Builder
+			for range length {
+				_ = value.WriteByte(alphabet[rng.Intn(len(alphabet))])
+			}
+			keywords[index] = value.String()
+		}
+		var text strings.Builder
+		for range 20 + rng.Intn(100) {
+			_ = text.WriteByte(alphabet[rng.Intn(len(alphabet))])
+		}
+
+		wantKeyword, wantHit := matchBlockedKeyword(text.String(), keywords)
+		gotKeyword, gotHit := newContentModerationKeywordMatcher(keywords).Match(text.String())
+		require.Equal(t, wantHit, gotHit, "iteration %d", iteration)
+		require.Equal(t, wantKeyword, gotKeyword, "iteration %d", iteration)
+	}
+}