more tests

tests/media-db-file-helper.test.ts

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+import { expect, test } from 'bun:test';
+import type { TFile } from 'obsidian';
+import { MediaDbFileHelper } from 'packages/obsidian/src/utils/MediaDbFileHelper';
+
+function createHelper(fileContent = '', frontmatter: Record<string, unknown> = {}): MediaDbFileHelper {
+	return new MediaDbFileHelper({
+		app: {
+			metadataCache: {
+				getFileCache: () => ({ frontmatter }),
+			},
+			vault: {
+				read: async () => fileContent,
+			},
+		},
+	} as never);
+}
+
+test('getMetaDataFromFileContent parses frontmatter and ignores body-only files', () => {
+	const helper = createHelper();
+
+	expect(helper.getMetaDataFromFileContent('---\ntitle: Arrival\nyear: 2016\nwatched: true\n---\nBody')).toEqual({
+		title: 'Arrival',
+		year: 2016,
+		watched: true,
+	});
+	expect(helper.getMetaDataFromFileContent('Body only')).toEqual({});
+});
+
+test('attachTemplate merges template metadata behind existing metadata and appends template body', async () => {
+	const helper = createHelper();
+
+	const result = await helper.attachTemplate({ title: 'Arrival', id: '1' }, 'Existing\n', '---\ntitle: Template\nrating: 8\n---\nTemplate body');
+
+	expect(result.fileMetadata).toEqual({ title: 'Arrival', rating: 8, id: '1' });
+	expect(result.fileContent).toBe('Existing\n\nTemplate body');
+});
+
+test('attachFile merges attached note metadata behind generated metadata and strips frontmatter', async () => {
+	const helper = createHelper('---\ntitle: Old title\ncustom: keep\n---\nAttached body', { title: 'Old title', custom: 'keep' });
+	const file = { path: 'old.md' } as TFile;
+
+	const result = await helper.attachFile({ title: 'New title', id: '1' }, '', file);
+
+	expect(result.fileMetadata).toEqual({ title: 'New title', custom: 'keep', id: '1' });
+	expect(result.fileContent).toBe('Attached body');
+});
+
+test('getMetadataFromFileCache returns a clone instead of cache object reference', () => {
+	const frontmatter = { title: 'Arrival', nested: { rating: 9 } };
+	const helper = createHelper('', frontmatter);
+	const metadata = helper.getMetadataFromFileCache({ path: 'movie.md' } as TFile);
+
+	(metadata.nested as { rating: number }).rating = 1;
+
+	expect(frontmatter.nested.rating).toBe(9);
+});