Start porting ESM tests

Author: TimothyGu

test/es-module/es-module.status

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+prefix parallel
+
+# To mark a test as flaky, list the test name in the appropriate section
+# below, without ".js", followed by ": PASS,FLAKY". Example:
+# sample-test                        : PASS,FLAKY
+
+[true] # This section applies to all platforms

test/es-module/test-esm-basic-imports.mjs

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+import '../common';
+import assert from 'assert';
+import ok from './test-esm-ok.mjs';
+import okShebang from './test-esm-shebang.mjs';
+
+assert(ok);
+assert(okShebang);

test/es-module/test-esm-forbidden-globals.mjs

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+import '../common';
+
+if (typeof arguments !== 'undefined') {
+  throw new Error('not an ESM');
+}
+if (typeof this !== 'undefined') {
+  throw new Error('not an ESM');
+}
+if (typeof exports !== 'undefined') {
+  throw new Error('not an ESM');
+}
+if (typeof require !== 'undefined') {
+  throw new Error('not an ESM');
+}
+if (typeof module !== 'undefined') {
+  throw new Error('not an ESM');
+}
+if (typeof __filename !== 'undefined') {
+  throw new Error('not an ESM');
+}
+if (typeof __dirname !== 'undefined') {
+  throw new Error('not an ESM');
+}

test/es-module/test-esm-ok.mjs

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+import '../common';
+
+const isJs = true;
+export default isJs;

test/es-module/test-esm-shebang.mjs

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+#! }]) // isn't js
+import '../common';
+
+const isJs = true;
+export default isJs;

test/es-module/testcfg.py

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+import sys, os
+sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
+import testpy
+
+def GetConfiguration(context, root):
+  return testpy.SimpleTestConfiguration(context, root, 'es-module')