Write tests of trim utils

test/utils/index.ts

@@ -0,0 +1,16 @@
+import * as assert from 'assert';
+import { trim_start, trim_end } from '../../src/compiler/utils/trim';
+
+describe('utils', () => {
+	describe('trim', () => {
+		it('trim_start', () => {
+			const value = trim_start('    content');
+			assert.equal(value, 'content');
+		});
+
+    it('trim_end', () => {
+			const value = trim_end('content    ');
+			assert.equal(value, 'content');
+		});
+	});
+});