test(build-in.test.ts): add

Author: refirst11

test/build-in.test.ts

@@ -0,0 +1,19 @@
+import { buildIn, isServer } from '../src/_internal';
+import { readFileSync, writeFileSync } from 'fs';
+
+const filePath = '../src/core/styles/style.module.css';
+
+test('buildIn should append styleSheet to style file and verify its content', () => {
+  if (!isServer) return;
+  const styleSheet = '.test-style { color: red; }';
+
+  // Run the test
+  buildIn(styleSheet);
+
+  // Check the file contents
+  const fileContent = readFileSync(filePath, 'utf-8');
+  expect(fileContent).toContain(styleSheet);
+
+  // Cleanup: Reset file contents after testing
+  writeFileSync(filePath, '/*_*/', 'utf-8');
+});