test: 编写 TTS 测试（mock HTTP，覆盖成功/API 错误/超时/空文本/取消/部分失败/自定义 voice）
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300
backend/internal/ai/tts/openai_test.go
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300
backend/internal/ai/tts/openai_test.go
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package tts
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import (
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"context"
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"fmt"
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"io"
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"net/http"
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"net/http/httptest"
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"strings"
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"sync/atomic"
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"testing"
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"time"
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"go.uber.org/zap"
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)
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// mockTTSServer 创建模拟 OpenAI TTS API 的 HTTP 服务器。
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func mockTTSServer(t *testing.T, handler http.HandlerFunc) *httptest.Server {
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t.Helper()
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return httptest.NewServer(handler)
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}
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// sendSentences 向 channel 发送句子并关闭。
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func sendSentences(sentences ...string) <-chan string {
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ch := make(chan string, len(sentences))
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for _, s := range sentences {
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ch <- s
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}
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close(ch)
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return ch
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}
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func TestOpenAIService_SynthesizeStream_Success(t *testing.T) {
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var callCount int32
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srv := mockTTSServer(t, func(w http.ResponseWriter, r *http.Request) {
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atomic.AddInt32(&callCount, 1)
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if r.Method != http.MethodPost {
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t.Errorf("method = %s, want POST", r.Method)
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}
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if !strings.Contains(r.URL.Path, "/audio/speech") {
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t.Errorf("path = %s, should contain /audio/speech", r.URL.Path)
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}
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auth := r.Header.Get("Authorization")
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if auth != "Bearer test-key" {
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t.Errorf("Authorization = %q, want %q", auth, "Bearer test-key")
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}
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// 验证请求体
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body, _ := io.ReadAll(r.Body)
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if !strings.Contains(string(body), "tts-1") {
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t.Errorf("request body should contain model tts-1")
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}
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// 返回假 MP3 数据
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w.Header().Set("Content-Type", "audio/mpeg")
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fmt.Fprintf(w, "fake-mp3-data")
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})
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defer srv.Close()
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svc := NewOpenAIService("test-key", "alloy", srv.URL, 1.0, 5, zap.NewNop().Sugar())
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textStream := sendSentences("你好", "世界", "！")
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ch, err := svc.SynthesizeStream(context.Background(), textStream, Options{
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Voice: "alloy", Speed: 1.0, OutputFmt: "mp3", SampleRate: 24000,
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})
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if err != nil {
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t.Fatalf("SynthesizeStream() error: %v", err)
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}
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var chunks []Chunk
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for c := range ch {
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chunks = append(chunks, c)
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}
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// 应该有 3 个音频 chunk + 1 个 IsLast 标记
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if len(chunks) != 4 {
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t.Fatalf("got %d chunks, want 4", len(chunks))
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}
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// 验证前 3 个有音频数据
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for i := 0; i < 3; i++ {
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if string(chunks[i].Audio) != "fake-mp3-data" {
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t.Errorf("chunk[%d].Audio = %q, want %q", i, string(chunks[i].Audio), "fake-mp3-data")
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}
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if chunks[i].IsLast {
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t.Errorf("chunk[%d].IsLast should be false", i)
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}
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}
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// 验证最后一个是 IsLast
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if !chunks[3].IsLast {
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t.Error("last chunk should be IsLast")
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}
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if chunks[3].Audio != nil {
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t.Error("last chunk Audio should be nil")
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}
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// 验证调用了 3 次 API（3 个句子）
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if atomic.LoadInt32(&callCount) != 3 {
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t.Errorf("API called %d times, want 3", callCount)
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}
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}
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func TestOpenAIService_SynthesizeStream_APIError(t *testing.T) {
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srv := mockTTSServer(t, func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "internal error")
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})
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defer srv.Close()
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svc := NewOpenAIService("test-key", "alloy", srv.URL, 1.0, 5, zap.NewNop().Sugar())
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textStream := sendSentences("你好")
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ch, err := svc.SynthesizeStream(context.Background(), textStream, Options{})
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if err != nil {
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t.Fatalf("SynthesizeStream() error: %v", err)
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}
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// 应该只有一个 IsLast chunk（音频被跳过）
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var chunks []Chunk
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for c := range ch {
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chunks = append(chunks, c)
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}
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if len(chunks) != 1 {
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t.Fatalf("got %d chunks, want 1 (IsLast only)", len(chunks))
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}
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if !chunks[0].IsLast {
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t.Error("chunk should be IsLast")
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}
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}
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func TestOpenAIService_SynthesizeStream_Timeout(t *testing.T) {
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srv := mockTTSServer(t, func(w http.ResponseWriter, r *http.Request) {
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time.Sleep(3 * time.Second)
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w.Header().Set("Content-Type", "audio/mpeg")
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fmt.Fprintf(w, "late-mp3")
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})
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defer srv.Close()
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// 1 秒超时
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svc := NewOpenAIService("test-key", "alloy", srv.URL, 1.0, 1, zap.NewNop().Sugar())
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textStream := sendSentences("很长的句子")
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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ch, err := svc.SynthesizeStream(ctx, textStream, Options{})
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if err != nil {
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t.Fatalf("SynthesizeStream() error: %v", err)
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}
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var chunks []Chunk
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for c := range ch {
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chunks = append(chunks, c)
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}
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// 超时后音频被跳过，只有 IsLast
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if len(chunks) != 1 {
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t.Fatalf("got %d chunks, want 1", len(chunks))
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}
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if !chunks[0].IsLast {
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t.Error("chunk should be IsLast")
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}
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}
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func TestOpenAIService_SynthesizeStream_EmptyText(t *testing.T) {
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var callCount int32
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srv := mockTTSServer(t, func(w http.ResponseWriter, r *http.Request) {
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atomic.AddInt32(&callCount, 1)
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w.Header().Set("Content-Type", "audio/mpeg")
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fmt.Fprintf(w, "mp3")
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})
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defer srv.Close()
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svc := NewOpenAIService("test-key", "alloy", srv.URL, 1.0, 5, zap.NewNop().Sugar())
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// 空句子应该被跳过
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textStream := sendSentences("", "你好", "")
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ch, err := svc.SynthesizeStream(context.Background(), textStream, Options{})
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if err != nil {
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t.Fatalf("SynthesizeStream() error: %v", err)
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}
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var chunks []Chunk
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for c := range ch {
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chunks = append(chunks, c)
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}
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// 只有 "你好" 应该被合成
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if atomic.LoadInt32(&callCount) != 1 {
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t.Errorf("API called %d times, want 1", callCount)
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}
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// 1 个音频 + 1 个 IsLast
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if len(chunks) != 2 {
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t.Fatalf("got %d chunks, want 2", len(chunks))
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}
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}
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func TestOpenAIService_SynthesizeStream_ContextCancelled(t *testing.T) {
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srv := mockTTSServer(t, func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "audio/mpeg")
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fmt.Fprintf(w, "mp3")
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})
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defer srv.Close()
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svc := NewOpenAIService("test-key", "alloy", srv.URL, 1.0, 5, zap.NewNop().Sugar())
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// 发送多个句子，但在第一个后取消
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textStream := make(chan string, 3)
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textStream <- "第一句"
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textStream <- "第二句"
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textStream <- "第三句"
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close(textStream)
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ctx, cancel := context.WithCancel(context.Background())
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// 立即取消
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cancel()
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ch, err := svc.SynthesizeStream(ctx, textStream, Options{})
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if err != nil {
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t.Fatalf("SynthesizeStream() error: %v", err)
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}
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// 消费 channel，应该很快结束
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var count int
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for range ch {
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count++
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}
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// 可能收到 0 个或 1 个 chunk，取决于时序
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t.Logf("received %d chunks after context cancel", count)
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}
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func TestOpenAIService_SynthesizeStream_PartialFailure(t *testing.T) {
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var callCount int32
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srv := mockTTSServer(t, func(w http.ResponseWriter, r *http.Request) {
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n := atomic.AddInt32(&callCount, 1)
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if n == 2 {
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// 第二个句子失败
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Fprintf(w, "error")
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return
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}
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w.Header().Set("Content-Type", "audio/mpeg")
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fmt.Fprintf(w, "mp3-%d", n)
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})
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defer srv.Close()
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svc := NewOpenAIService("test-key", "alloy", srv.URL, 1.0, 5, zap.NewNop().Sugar())
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textStream := sendSentences("第一句", "第二句", "第三句")
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ch, err := svc.SynthesizeStream(context.Background(), textStream, Options{})
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if err != nil {
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t.Fatalf("SynthesizeStream() error: %v", err)
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}
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var chunks []Chunk
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for c := range ch {
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chunks = append(chunks, c)
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}
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// 2 个成功音频 + 1 个 IsLast（第二句被跳过）
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if len(chunks) != 3 {
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t.Fatalf("got %d chunks, want 3", len(chunks))
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}
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if !chunks[len(chunks)-1].IsLast {
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t.Error("last chunk should be IsLast")
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}
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}
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func TestOpenAIService_SynthesizeStream_CustomVoice(t *testing.T) {
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srv := mockTTSServer(t, func(w http.ResponseWriter, r *http.Request) {
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body, _ := io.ReadAll(r.Body)
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if !strings.Contains(string(body), "nova") {
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t.Errorf("request body should contain voice 'nova', got: %s", string(body))
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}
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w.Header().Set("Content-Type", "audio/mpeg")
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fmt.Fprintf(w, "mp3")
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})
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defer srv.Close()
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svc := NewOpenAIService("test-key", "alloy", srv.URL, 1.0, 5, zap.NewNop().Sugar())
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textStream := sendSentences("你好")
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ch, err := svc.SynthesizeStream(context.Background(), textStream, Options{Voice: "nova"})
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if err != nil {
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t.Fatalf("SynthesizeStream() error: %v", err)
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}
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for range ch {
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}
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}
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