test: add additional fixtures and tests for irp

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

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+// Flags: --experimental-modules
+/* eslint-disable node-core/required-modules */
+
+import '../common/index.mjs';
+import assert from 'assert';
+
+import legacyLoader from '../fixtures/irp/legacy-loader/index.mjs';
+import newLoader from '../fixtures/irp/new-loader/index.js';
+
+assert.strictEqual(legacyLoader, 'legacy-loader');
+assert.strictEqual(newLoader, 'new-loader');

test/fixtures/irp/legacy-loader/a.js

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+module.exports = 'a';

test/fixtures/irp/legacy-loader/b.mjs

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+export const b = 'b';

test/fixtures/irp/legacy-loader/c.cjs

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+module.exports = {
+  one: 1,
+  two: 2,
+  three: 3
+};

test/fixtures/irp/legacy-loader/index.mjs

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+// js file that is common.js
+import a from './a.js';
+// ESM with named export
+import {b} from './b.mjs';
+// import 'c.cjs';
+import cjs from './c.cjs';
+// proves cross boundary fun bits
+import jsAsEsm from '../new-loader/a.js';
+
+// named export from core
+import {strictEqual, deepStrictEqual} from 'assert';
+
+strictEqual(a, jsAsEsm);
+strictEqual(b, 'b');
+deepStrictEqual(cjs, {
+  one: 1,
+  two: 2,
+  three: 3
+});
+
+export default 'legacy-loader';

test/fixtures/irp/legacy-loader/package.json

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+{
+  "name": "legacy-loader",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Myles Borins <mylesborins@google.com>",
+  "license": "Apache-2.0",
+  "type": "commonjs"
+}

test/fixtures/irp/new-loader/a.js

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+export default 'a'

test/fixtures/irp/new-loader/b.mjs

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+export const b = 'b';

test/fixtures/irp/new-loader/c.cjs

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+module.exports = {
+  one: 1,
+  two: 2,
+  three: 3
+};

test/fixtures/irp/new-loader/index.js

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+// ESM with only default
+import a from './a.js';
+// ESM with named export
+import {b} from './b.mjs';
+// import 'c.cjs';
+import cjs from './c.cjs';
+// import across boundaries
+import jsAsCjs from '../legacy-loader/a.js'
+
+// named export from core
+import {strictEqual, deepStrictEqual} from 'assert';
+
+strictEqual(a, jsAsCjs);
+strictEqual(b, 'b');
+deepStrictEqual(cjs, {
+  one: 1,
+  two: 2,
+  three: 3
+});
+
+export default 'new-loader';

test/fixtures/irp/new-loader/package.json

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+{
+  "name": "new-loader",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Myles Borins <mylesborins@google.com>",
+  "license": "Apache-2.0",
+  "type": "module"
+}