Extract addPackagesToManifests to unit test

There is a but here we would like to test

componentDetection.test.ts

@@ -68,3 +68,78 @@ describe("ComponentDetection.makePackageUrl", () => {
     expect(packageUrl).toBe("");
   });
 });
+
+describe("ComponentDetection.addPackagesToManifests", () => {
+  test("adds package as direct dependency when no top level referrers", () => {
+    const manifests: any[] = [];
+
+    const mockPackage = {
+      id: "test-package-1",
+      packageUrl: "pkg:npm/test-package@1.0.0",
+      isDevelopmentDependency: false,
+      topLevelReferrers: [],
+      locationsFoundAt: ["package.json"],
+      containerDetailIds: [],
+      containerLayerIds: [],
+      packageID: () => "pkg:npm/test-package@1.0.0",
+      packageURL: { toString: () => "pkg:npm/test-package@1.0.0" }
+    };
+
+    ComponentDetection.addPackagesToManifests([mockPackage] as any, manifests);
+
+    expect(manifests).toHaveLength(1);
+    expect(manifests[0].name).toBe("package.json");
+  });
+
+  test("adds package as indirect dependency when has top level referrers", () => {
+    const manifests: any[] = [];
+
+    const mockPackage = {
+      id: "test-package-2",
+      packageUrl: "pkg:npm/test-package@2.0.0",
+      isDevelopmentDependency: false,
+      topLevelReferrers: [{ packageUrl: "pkg:npm/parent-package@1.0.0" }],
+      locationsFoundAt: ["package.json"],
+      containerDetailIds: [],
+      containerLayerIds: [],
+      packageID: () => "pkg:npm/test-package@2.0.0",
+      packageURL: { toString: () => "pkg:npm/test-package@2.0.0" }
+    };
+
+    ComponentDetection.addPackagesToManifests([mockPackage] as any, manifests);
+
+    expect(manifests).toHaveLength(1);
+    expect(manifests[0].name).toBe("package.json");
+  });
+
+  test("reuses existing manifest when same location found", () => {
+    let directDependencyCallCount = 0;
+    let indirectDependencyCallCount = 0;
+
+    const existingManifest = {
+      name: "package.json",
+      addDirectDependency: () => { directDependencyCallCount++; },
+      addIndirectDependency: () => { indirectDependencyCallCount++; }
+    };
+    const manifests: any[] = [existingManifest];
+
+    const mockPackage = {
+      id: "test-package-3",
+      packageUrl: "pkg:npm/test-package@3.0.0",
+      isDevelopmentDependency: false,
+      topLevelReferrers: [],
+      locationsFoundAt: ["package.json"],
+      containerDetailIds: [],
+      containerLayerIds: [],
+      packageID: () => "pkg:npm/test-package@3.0.0",
+      packageURL: { toString: () => "pkg:npm/test-package@3.0.0" }
+    };
+
+    ComponentDetection.addPackagesToManifests([mockPackage] as any, manifests);
+
+    expect(manifests).toHaveLength(1);
+    expect(manifests[0]).toBe(existingManifest);
+    expect(directDependencyCallCount).toBe(1);
+    expect(indirectDependencyCallCount).toBe(0);
+  });
+});

componentDetection.ts

@@ -135,6 +135,12 @@ export default class ComponentDetection {
     const manifests: Array<Manifest> = [];
 
     // Check the locationsFoundAt for every package and add each as a manifest
+    this.addPackagesToManifests(packages, manifests);
+
+    return manifests;
+  }
+
+  public static addPackagesToManifests(packages: Array<ComponentDetectionPackage>, manifests: Array<Manifest>): void {
     packages.forEach(async (pkg: ComponentDetectionPackage) => {
       pkg.locationsFoundAt.forEach(async (location: any) => {
         if (!manifests.find((manifest: Manifest) => manifest.name == location)) {
@@ -148,7 +154,6 @@ export default class ComponentDetection {
         }
       });
     });
-    return manifests;
   }
 
   private static getDependencyScope(pkg: ComponentDetectionPackage) {