feat: complete remaining Go backend modules

backend/internal/prompt/assembler_test.go

@@ -0,0 +1,36 @@
+package prompt
+
+import "testing"
+
+func TestAssembleManualPromptNormalizesMaterialsAndWarnings(t *testing.T) {
+	result := Assemble(Input{Mode: "image", ManualPrompt: "  use @图片2 and @视频1  ", Materials: []Material{
+		{URL: "/b.mp4", Type: "video"}, {URL: "/a.png", Type: "image"}, {URL: "/empty", Type: ""}, {URL: "", Type: "image"},
+	}})
+	if result.Prompt != "use @图片2 and @视频1" || result.Requirements.Image != 2 || result.Requirements.Video != 1 {
+		t.Fatalf("unexpected result %#v", result)
+	}
+	if len(result.Materials) != 3 || result.Materials[0].Label != "@图片1" || result.Materials[1].Label != "@图片2" || result.Materials[2].Label != "@视频1" {
+		t.Fatalf("materials %#v", result.Materials)
+	}
+	if len(result.Warnings) != 0 {
+		t.Fatalf("warnings %#v", result.Warnings)
+	}
+}
+
+func TestAssembleDefaultsImageAndVideoScenes(t *testing.T) {
+	image := Assemble(Input{Mode: "image", ProjectName: " 项目 ", AspectRatio: "16:9"})
+	if image.Blocked || len(image.Scenes) != 5 || image.Prompt == "" || image.Requirements.Image != 4 {
+		t.Fatalf("image %#v", image)
+	}
+	video := Assemble(Input{Mode: "video", ProjectName: "项目"})
+	if len(video.Scenes) != 5 || video.Requirements.Image != 5 {
+		t.Fatalf("video %#v", video)
+	}
+}
+
+func TestExtractRequirementsDeduplicatesAliases(t *testing.T) {
+	requirements := ExtractRequirements("@图2 @图片2 @参考视频3 @视频1 @音频4 @图片0")
+	if requirements.Image != 2 || requirements.Video != 3 || requirements.Audio != 4 {
+		t.Fatalf("requirements %#v", requirements)
+	}
+}