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test/es-module/test-require-module-twice.js

@@ -0,0 +1,21 @@
+// Flags: --experimental-require-module
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+const modules = [
+  '../fixtures/es-module-loaders/module-named-exports.mjs',
+  '../fixtures/es-modules/import-esm.mjs',
+  '../fixtures/es-modules/require-cjs.mjs',
+  '../fixtures/es-modules/cjs-exports.mjs',
+  '../common/index.mjs',
+  '../fixtures/es-modules/package-type-module/index.js',
+];
+
+for (const id of modules) {
+  const first = require(id);
+  const second = require(id);
+  assert.strictEqual(first, second,
+                     `the results of require('${id}') twice are not reference equal`);
+}