diff --git a/packages/sonda/tests/generate.test.ts b/packages/sonda/tests/generate.test.ts
new file mode 100644
index 0000000..8a8da37
--- /dev/null
+++ b/packages/sonda/tests/generate.test.ts
@@ -0,0 +1,57 @@
+import { vi, describe, it, expect, beforeEach } from 'vitest';
+import { generateReportFromAssets } from '../src/report/generate';
+import { normalizeOptions } from '../src/utils';
+
+const mocks = vi.hoisted( () => ( {
+	open: vi.fn(),
+	generateHtmlReport: vi.fn(),
+	generateJsonReport: vi.fn(),
+	writeFileSync: vi.fn(),
+} ) );
+
+vi.mock( 'fs', () => ( {
+	writeFileSync: mocks.writeFileSync,
+} ) );
+
+vi.mock( 'open', () => ( {
+	default: mocks.open,
+} ) );
+
+vi.mock( '../src/report.js', () => ( {
+	generateHtmlReport: mocks.generateHtmlReport,
+	generateJsonReport: mocks.generateJsonReport,
+} ) );
+
+describe( 'generate.ts', () => {
+	beforeEach( () => {
+		vi.clearAllMocks();
+	} );
+
+	it( 'saves HTML report by default', async () => {
+		await generateReportFromAssets( [], {}, normalizeOptions() );
+
+		expect( mocks.writeFileSync ).toHaveBeenCalled();
+		expect( mocks.generateHtmlReport ).toHaveBeenCalled();
+		expect( mocks.generateJsonReport ).not.toHaveBeenCalled();
+	} );
+
+	it( 'saves JSON report', async () => {
+		await generateReportFromAssets( [], {}, normalizeOptions( { format: 'json' } ) );
+
+		expect( mocks.writeFileSync ).toHaveBeenCalled();
+		expect( mocks.generateJsonReport ).toHaveBeenCalled();
+		expect( mocks.generateHtmlReport ).not.toHaveBeenCalled();
+	} );
+
+	it( 'opens the generated report by default', async () => {
+		await generateReportFromAssets( [], {}, normalizeOptions() );
+
+		expect( mocks.open ).toHaveBeenCalled();
+	} );
+
+	it( 'doesnt open the generated report with `options.open = false`', async () => {
+		await generateReportFromAssets( [], {}, normalizeOptions( { open: false } ) );
+
+		expect( mocks.open ).not.toHaveBeenCalled();
+	} );
+} );