more tests fixes

Author: dummdidumm

packages/svelte/tests/helpers.js

@@ -172,3 +172,13 @@ export function write(file, contents) {
 
 	fs.writeFileSync(file, contents);
 }
+
+// @ts-expect-error JS DOM doesn't support it
+Window.prototype.matchMedia = (media) => {
+	return {
+		matches: false,
+		media,
+		addEventListener: () => {},
+		removeEventListener: () => {}
+	};
+};

packages/svelte/tests/motion/test.ts

@@ -1,3 +1,5 @@
+// @vitest-environment jsdom
+import '../helpers.js'; // for the matchMedia polyfill
 import { describe, it, assert } from 'vitest';
 import { get } from 'svelte/store';
 import { spring, tweened } from 'svelte/motion';

packages/svelte/tests/runtime-legacy/shared.ts

@@ -478,13 +478,3 @@ export function ok(value: any): asserts value {
 		throw new Error(`Expected truthy value, got ${value}`);
 	}
 }
-
-// @ts-expect-error JS DOM doesn't support it
-Window.prototype.matchMedia = (media) => {
-	return {
-		matches: false,
-		media,
-		addEventListener: () => {},
-		removeEventListener: () => {}
-	};
-};