loader,test: implement skipped test

Implement how the skipped test should behave.

test/es-module/test-esm-loader-programmatically.mjs

@@ -10,7 +10,28 @@ import { spawnPromisified } from '../common/index.mjs';
 describe('ESM: register loader programmatically', { concurrency: true }, () => {
   it('should be able to register programmatically loader', {
     skip: 'Skipping for now because --experimental-loader option is required to use the CustomModuleLoader'
-  }, async () => {});
+  }, async () => {
+    const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
+      '--no-warnings',
+      fixtures.path('/es-module-loaders/register-loader-entrypoint.mjs'),
+    ]);
+
+    assert.strictEqual(stderr, '');
+    assert.strictEqual(code, 0);
+    assert.strictEqual(signal, null);
+
+    const lines = stdout.split('\n');
+
+    // Execute "resolve" hook for "register-loader-app.mjs".
+    assert.match(lines[0], /resolve register loader two/);
+    // Execute "load" hook for "register-loader-app.mjs".
+    assert.match(lines[1], /load register loader two/);
+
+    // Finally, gets in the application.
+    assert.match(lines[2], /running application/);
+
+    assert.strictEqual(lines[3], '');
+  });
 
   it('should be able to register loader programmatically in the same chain of CLI loaders', async () => {
     const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [