Fix matchers and add tests

__tests__/matchers.test.ts

@@ -0,0 +1,34 @@
+import * as io from '@actions/io';
+import * as path from 'path';
+import * as fs from 'fs';
+import * as matchers from '../src/matchers';
+
+async function cleanup(path: string): Promise<void> {
+  fs.unlink(path, error => {
+    if (error) {
+      console.log(error);
+    }
+  });
+}
+
+jest.mock('@actions/io');
+
+describe('Matchers', () => {
+  it('Add matchers', async () => {
+    process.env['RUNNER_TOOL_CACHE'] = __dirname;
+    await matchers.addMatchers();
+    const spy = jest.spyOn(io, 'cp');
+    expect(spy).toHaveBeenCalledTimes(1);
+  });
+
+  it('Test Regex', async () => {
+    const regex1 = /^\d+\)\s.*$/;
+    const regex2 = /^(.*)$/;
+    const regex3 = /^\s*$/;
+    const regex4 = /^(.*):(\d+)$/;
+    expect(regex1.test('1) Tests\\Test::it_tests')).toBe(true);
+    expect(regex2.test('Failed asserting that false is true')).toBe(true);
+    expect(regex3.test('\n')).toBe(true);
+    expect(regex4.test('/path/to/file.php:42')).toBe(true);
+  });
+});