test: add episode metadata route test

internal/playback/handler/episode_metadata_test.go

@@ -0,0 +1,59 @@
+package handler
+
+import (
+	"context"
+	"encoding/json"
+	"mal/internal/domain"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+)
+
+type episodeMetadataAnimeService struct {
+	domain.AnimePlaybackService
+}
+
+func (s episodeMetadataAnimeService) GetAllEpisodes(context.Context, int) ([]domain.EpisodeData, error) {
+	return []domain.EpisodeData{
+		{MalID: 1, Title: "The Beginning"},
+		{MalID: 2, Title: "The Follow-Up"},
+	}, nil
+}
+
+func (s episodeMetadataAnimeService) GetAnimeByID(context.Context, int) (domain.Anime, error) {
+	return domain.Anime{}, nil
+}
+
+func TestEpisodeMetadataRouteReturnsEpisodeTitles(t *testing.T) {
+	t.Parallel()
+
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	h := NewPlaybackHandler(nil, episodeMetadataAnimeService{})
+	h.Register(router)
+
+	req := httptest.NewRequestWithContext(context.Background(), http.MethodGet, "/api/watch/episodes/123/metadata", nil)
+	rec := httptest.NewRecorder()
+	router.ServeHTTP(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
+	}
+
+	var got []struct {
+		MalID int    `json:"mal_id"`
+		Title string `json:"title"`
+	}
+	if err := json.Unmarshal(rec.Body.Bytes(), &got); err != nil {
+		t.Fatalf("json.Unmarshal() error = %v", err)
+	}
+
+	if len(got) != 2 {
+		t.Fatalf("len(got) = %d, want 2", len(got))
+	}
+	if got[0].MalID != 1 || got[0].Title != "The Beginning" {
+		t.Fatalf("got[0] = %+v, want episode 1 title", got[0])
+	}
+}