fix filters and add unit test

Author: dominikg

packages/vite-plugin-svelte/__tests__/id.spec.js

@@ -0,0 +1,39 @@
+import { describe, it, expect } from 'vitest';
+import { buildIdFilter, buildModuleIdFilter } from '../src/utils/id.js';
+
+function passes(filter, id) {
+	const included = filter.id.include.some((includeRE) => includeRE.test(id));
+	return included && !filter.id.exclude.some((excludeRE) => excludeRE.test(id));
+}
+
+describe('buildIdFilter', () => {
+	it('default filter matches .svelte files', () => {
+		const filter = buildIdFilter({});
+		expect(passes(filter, '/src/Foo.svelte')).toBe(true);
+		expect(passes(filter, '/src/Foo.svelte?something')).toBe(true);
+	});
+
+	it('custom filter matches .svx files', () => {
+		const filter = buildIdFilter({ extensions: ['.svelte', '.svx'] });
+		expect(passes(filter, '/src/Foo.svx')).toBe(true);
+		expect(passes(filter, '/src/Foo.svx?something')).toBe(true);
+	});
+});
+
+describe('buildModuleIdFilter', () => {
+	it('default filter matches .svelte. files', () => {
+		const filter = buildModuleIdFilter({});
+		expect(passes(filter, '/src/foo.svelte.js')).toBe(true);
+		expect(passes(filter, '/src/foo.svelte.ts')).toBe(true);
+		expect(passes(filter, '/src/foo.svelte.test.js')).toBe(true);
+		expect(passes(filter, '/src/foo.svelte.test.ts')).toBe(true);
+	});
+
+	it('custom filter matches .svx. files', () => {
+		const filter = buildModuleIdFilter({ experimental: { compileModule: { infixes: ['.svx.'] } } });
+		expect(passes(filter, '/src/foo.svx.js')).toBe(true);
+		expect(passes(filter, '/src/foo.svx.ts')).toBe(true);
+		expect(passes(filter, '/src/foo.svx.test.js')).toBe(true);
+		expect(passes(filter, '/src/foo.svx.test.ts')).toBe(true);
+	});
+});