add regression test

Author: phated

test/esm.js

@@ -60,4 +60,33 @@ describe('ESM', function() {
     }
   });
 
+  it('prints the task list (top-level await)', function(done) {
+    if (shouldSkip()) {
+      this.skip();
+    }
+
+    var options = '--tasks --sort-tasks --gulpfile ./test/fixtures/gulpfiles/gulpfile-tla.mjs';
+    var trailingLines = 1;
+    if (!semver.satisfies(process.version, '^12.17.0 || >=13.2.0')) {
+      options += ' --experimental-modules';
+      trailingLines += 2;
+    }
+
+    var opts = { cwd: baseDir };
+    exec(gulp(options), opts, cb);
+
+    function cb(err, stdout, stderr) {
+      expect(err).toBeNull();
+      if (!semver.satisfies(process.version, '^12.20.0 || >=13.14.0')) {
+        expect(stderr).toMatch('ExperimentalWarning: The ESM module loader is experimental.\n');
+      } else {
+        expect(stderr).toEqual('');
+      }
+      var filepath = path.join(expectedDir, 'esm.txt');
+      var expected = fs.readFileSync(filepath, 'utf-8');
+      expect(sliceLines(stdout, trailingLines)).toEqual(expected);
+      done(err);
+    }
+  });
+
 });

test/fixtures/gulpfiles/gulpfile-tla.mjs

@@ -0,0 +1,7 @@
+const dynamicNoop = await Promise.resolve(function noop(cb) {
+  cb();
+});
+
+export const registered = dynamicNoop;
+export function exported(){};
+export const string = 'no function';