chore: improve test cases (#14984)

* chore: improve test cases

* lint

Author: trueadm

packages/svelte/tests/runtime-browser/custom-elements-samples/camel-case-attribute/_config.js

@@ -1,3 +1,4 @@
+import { flushSync } from 'svelte';
 import { test } from '../../assert';
 const tick = () => Promise.resolve();
 
@@ -14,8 +15,7 @@ export default test({
 		el.setAttribute('camel-case', 'universe');
 		el.setAttribute('an-array', '[3,4]');
 		el.setAttribute('camelcase2', 'Hi');
-		await tick();
-		await tick();
+		flushSync();
 		assert.htmlEqual(el.shadowRoot.innerHTML, '<h1>Hi universe!</h1> <p>3</p><p>4</p>');
 		assert.htmlEqual(
 			target.innerHTML,
@@ -25,8 +25,7 @@ export default test({
 		el.camelCase = 'galaxy';
 		el.camelCase2 = 'Hey';
 		el.anArray = [5, 6];
-		await tick();
-		await tick();
+		flushSync();
 		assert.htmlEqual(el.shadowRoot.innerHTML, '<h1>Hey galaxy!</h1> <p>5</p><p>6</p>');
 		assert.htmlEqual(
 			target.innerHTML,

packages/svelte/tests/runtime-browser/custom-elements-samples/custom-method/_config.js

@@ -1,3 +1,4 @@
+import { flushSync } from 'svelte';
 import { test } from '../../assert';
 const tick = () => Promise.resolve();
 
@@ -8,7 +9,8 @@ export default test({
 		/** @type {any} */
 		const el = target.querySelector('custom-element');
 
-		await el.updateFoo(42);
+		el.updateFoo(42);
+		flushSync();
 
 		const p = el.shadowRoot.querySelector('p');
 		assert.equal(p.textContent, '42');

packages/svelte/tests/runtime-browser/custom-elements-samples/element-effect-context/_config.js

@@ -1,4 +1,5 @@
 import { test } from '../../assert';
+import { flushSync } from 'svelte';
 const tick = () => Promise.resolve();
 
 export default test({
@@ -16,7 +17,7 @@ export default test({
 		assert.equal(p.innerHTML, 'false');
 
 		button.click();
-		await tick();
+		flushSync();
 
 		assert.equal(button.innerHTML, '1');
 		assert.equal(p.innerHTML, 'false');

packages/svelte/tests/runtime-legacy/samples/action-custom-event-handler-in-each-destructured/_config.js

@@ -1,3 +1,4 @@
+import { flushSync } from 'svelte';
 import { test } from '../../test';
 
 export default test({
@@ -10,12 +11,13 @@ export default test({
 		<p>second: </p>
 	`,
 
-	async test({ assert, component, target, window }) {
+	test({ assert, component, target, window }) {
 		const event = new window.MouseEvent('click');
 
 		const buttons = target.querySelectorAll('button');
 
-		await buttons[1].dispatchEvent(event);
+		buttons[1].dispatchEvent(event);
+		flushSync();
 
 		assert.htmlEqual(
 			target.innerHTML,

packages/svelte/tests/runtime-legacy/samples/action-custom-event-handler-in-each/_config.js

@@ -1,3 +1,4 @@
+import { flushSync } from 'svelte';
 import { test } from '../../test';
 
 export default test({
@@ -10,12 +11,13 @@ export default test({
 		<p>fromState: </p>
 	`,
 
-	async test({ assert, component, target, window }) {
+	test({ assert, component, target, window }) {
 		const event = new window.MouseEvent('click');
 
 		const buttons = target.querySelectorAll('button');
 
-		await buttons[1].dispatchEvent(event);
+		buttons[1].dispatchEvent(event);
+		flushSync();
 
 		assert.htmlEqual(
 			target.innerHTML,

packages/svelte/tests/runtime-legacy/samples/action-custom-event-handler-node-context/_config.js

@@ -1,17 +1,19 @@
+import { flushSync } from 'svelte';
 import { ok, test } from '../../test';
 
 export default test({
 	mode: ['client', 'hydrate'],
 
 	html: '<button>10</button>',
 
-	async test({ assert, target, window }) {
+	test({ assert, target, window }) {
 		const event = new window.MouseEvent('click');
 
 		const button = target.querySelector('button');
 		ok(button);
 
-		await button.dispatchEvent(event);
+		button.dispatchEvent(event);
+		flushSync();
 
 		assert.htmlEqual(target.innerHTML, '<button>11</button>');
 	}

packages/svelte/tests/runtime-legacy/samples/action-custom-event-handler-with-context/_config.js

@@ -1,9 +1,10 @@
+import { flushSync } from 'svelte';
 import { ok, test } from '../../test';
 
 export default test({
 	html: '<button>???</button>',
 
-	async test({ assert, target, window }) {
+	test({ assert, target, window }) {
 		const event = new window.MouseEvent('click', {
 			clientX: 42,
 			clientY: 42
@@ -12,7 +13,8 @@ export default test({
 		const button = target.querySelector('button');
 		ok(button);
 
-		await button.dispatchEvent(event);
+		button.dispatchEvent(event);
+		flushSync();
 
 		assert.htmlEqual(target.innerHTML, '<button>42</button>');
 	}

packages/svelte/tests/runtime-legacy/samples/action-custom-event-handler/_config.js

@@ -1,9 +1,10 @@
+import { flushSync } from 'svelte';
 import { ok, test } from '../../test';
 
 export default test({
 	html: '<button>0, 0</button>',
 
-	async test({ assert, target, window }) {
+	test({ assert, target, window }) {
 		const event = new window.MouseEvent('click', {
 			clientX: 42,
 			clientY: 42
@@ -12,7 +13,8 @@ export default test({
 		const button = target.querySelector('button');
 		ok(button);
 
-		await button.dispatchEvent(event);
+		button.dispatchEvent(event);
+		flushSync();
 
 		assert.htmlEqual(target.innerHTML, '<button>42, 42</button>');
 	}

packages/svelte/tests/runtime-legacy/samples/action-this/_config.js

@@ -1,3 +1,4 @@
+import { flushSync } from 'svelte';
 import { ok, test } from '../../test';
 
 export default test({
@@ -8,7 +9,8 @@ export default test({
 		const click = new window.MouseEvent('click');
 
 		assert.htmlEqual(target.innerHTML, '<button>1</button>');
-		await button.dispatchEvent(click);
+		button.dispatchEvent(click);
+		flushSync();
 		assert.htmlEqual(target.innerHTML, '<button>2</button>');
 	}
 });

packages/svelte/tests/runtime-legacy/samples/await-mutate-array/_config.js

@@ -1,3 +1,4 @@
+import { flushSync } from 'svelte';
 import { test } from '../../test';
 
 export default test({
@@ -11,7 +12,9 @@ export default test({
 		const [b1] = target.querySelectorAll('button');
 
 		b1.click();
-		await Promise.resolve();
+		Promise.resolve();
+		flushSync();
+
 		assert.htmlEqual(
 			target.innerHTML,
 			`<button>2</button><button>3</button><button>4</button>\n-------\n<button>1</button>`