Add test

node-src/lib/getPrebuiltStorybookMetadata.test.ts

@@ -0,0 +1,61 @@
+import { getStorybookMetadataFromProjectJson } from './getPrebuiltStorybookMetadata';
+
+import { readFile } from 'jsonfile';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+vi.mock('jsonfile', async (importOriginal) => {
+  return {
+    // @ts-expect-error TS does not think actual is an object, but it's fine.
+    ...(await importOriginal()),
+    readFile: vi.fn(() =>
+      Promise.resolve({
+        addons: {
+          '@storybook/addon-essentials': { version: '8.1.0' },
+          '@storybook/addon-links': { version: '8.1.0' },
+        },
+        builder: 'webpack5',
+        framework: { name: 'react' },
+        storybookVersion: '8.1.0',
+        storybookPackages: {
+          '@storybook/react': { version: '8.1.0' },
+          '@storybook/builder-webpack5': { version: '8.1.0' },
+          '@storybook/addon-essentials': { version: '8.1.0' },
+          '@storybook/addon-links': { version: '8.1.0' },
+        },
+      })
+    ),
+  };
+});
+
+describe('getStorybookMetadataFromProjectJson', () => {
+  it('should return the metadata from the project.json file', async () => {
+    const projectJsonPath = 'path/to/project.json';
+    const metadata = await getStorybookMetadataFromProjectJson(projectJsonPath);
+
+    expect(metadata).toEqual({
+      viewLayer: 'react',
+      version: '8.1.0',
+      builder: {
+        name: 'webpack5',
+        packageVersion: '8.1.0',
+      },
+      addons: [
+        {
+          name: 'essentials',
+          packageName: '@storybook/addon-essentials',
+          packageVersion: '8.1.0',
+        },
+        {
+          name: 'links',
+          packageName: '@storybook/addon-links',
+          packageVersion: '8.1.0',
+        },
+      ],
+    });
+    expect(readFile).toHaveBeenCalledWith(projectJsonPath);
+  });
+});