tidier output

Author: Rich-Harris

packages/svelte/tests/hydration/samples/ignore-mismatched-href/_config.js

@@ -11,5 +11,9 @@ export default test({
 
 	test(assert, target) {
 		assert.equal(target.querySelector('a')?.getAttribute('href'), '/bar');
-	}
+	},
+
+	errors: [
+		'Detected a href attribute value change during hydration. This will not be repaired during hydration, the href value that came from the server will be used. Related element:'
+	]
 });

packages/svelte/tests/hydration/test.ts

@@ -32,6 +32,7 @@ interface HydrationTest extends BaseTest {
 	) => void | Promise<void>;
 	before_test?: () => void;
 	after_test?: () => void;
+	errors?: any[];
 }
 
 function read(path: string): string | void {
@@ -65,6 +66,7 @@ const { test, run } = suite<HydrationTest>(async (config, cwd) => {
 		const snapshot = config.snapshot ? config.snapshot(target) : {};
 
 		const error = console.error;
+		const errors: any[] = [];
 		let got_hydration_error = false;
 		console.error = (message: any) => {
 			if (typeof message === 'string' && message.startsWith('ERR_SVELTE_HYDRATION_MISMATCH')) {
@@ -73,7 +75,7 @@ const { test, run } = suite<HydrationTest>(async (config, cwd) => {
 					error(message);
 				}
 			} else {
-				error(message);
+				errors.push(message);
 			}
 		};
 
@@ -85,12 +87,19 @@ const { test, run } = suite<HydrationTest>(async (config, cwd) => {
 		});
 
 		console.error = error;
+
 		if (config.expect_hydration_error) {
 			assert.ok(got_hydration_error, 'Expected hydration error');
 		} else {
 			assert.ok(!got_hydration_error, 'Unexpected hydration error');
 		}
 
+		if (config.errors) {
+			assert.deepEqual(errors, config.errors);
+		} else if (errors.length) {
+			throw new Error(`Unexpected errors: ${errors.join('\n')}`);
+		}
+
 		const expected = read(`${cwd}/_expected.html`) ?? rendered.html;
 		assert_html_equal(target.innerHTML, expected);
 

packages/svelte/tests/runtime-browser/test.ts

@@ -14,7 +14,6 @@ let browser: import('@playwright/test').Browser;
 
 beforeAll(async () => {
 	browser = await chromium.launch();
-	console.log('[runtime-browser] Launched browser');
 }, 20000);
 
 afterAll(async () => {