test,module: add test for exports cjs loader check

Refs: #31001 (comment)

PR-URL: #31427
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

test/fixtures/bluebird/package.json

@@ -0,0 +1,78 @@
+{
+  "name": "bluebird",
+  "description": "Full featured Promises/A+ implementation with exceptionally good performance",
+  "version": "3.7.2",
+  "keywords": [
+    "promise",
+    "performance",
+    "promises",
+    "promises-a",
+    "promises-aplus",
+    "async",
+    "await",
+    "deferred",
+    "deferreds",
+    "future",
+    "flow control",
+    "dsl",
+    "fluent interface"
+  ],
+  "scripts": {
+    "lint": "node scripts/jshint.js",
+    "test": "node --expose-gc tools/test.js",
+    "istanbul": "istanbul",
+    "prepublish": "npm run generate-browser-core && npm run generate-browser-full",
+    "generate-browser-full": "node tools/build.js --no-clean --no-debug --release --browser --minify",
+    "generate-browser-core": "node tools/build.js --features=core --no-debug --release --zalgo --browser --minify && mv js/browser/bluebird.js js/browser/bluebird.core.js && mv js/browser/bluebird.min.js js/browser/bluebird.core.min.js"
+  },
+  "homepage": "https://github.com/petkaantonov/bluebird",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/petkaantonov/bluebird.git"
+  },
+  "bugs": {
+    "url": "http://github.com/petkaantonov/bluebird/issues"
+  },
+  "license": "MIT",
+  "author": {
+    "name": "Petka Antonov",
+    "email": "petka_antonov@hotmail.com",
+    "url": "http://github.com/petkaantonov/"
+  },
+  "devDependencies": {
+    "acorn": "^6.0.2",
+    "acorn-walk": "^6.1.0",
+    "baconjs": "^0.7.43",
+    "bluebird": "^2.9.2",
+    "body-parser": "^1.10.2",
+    "browserify": "^8.1.1",
+    "cli-table": "~0.3.1",
+    "co": "^4.2.0",
+    "cross-spawn": "^0.2.3",
+    "glob": "^4.3.2",
+    "grunt-saucelabs": "~8.4.1",
+    "highland": "^2.3.0",
+    "istanbul": "^0.3.5",
+    "jshint": "^2.6.0",
+    "jshint-stylish": "~0.2.0",
+    "kefir": "^2.4.1",
+    "mkdirp": "~0.5.0",
+    "mocha": "~2.1",
+    "open": "~0.0.5",
+    "optimist": "~0.6.1",
+    "rimraf": "~2.2.6",
+    "rx": "^2.3.25",
+    "serve-static": "^1.7.1",
+    "sinon": "~1.7.3",
+    "uglify-js": "~2.4.16"
+  },
+  "readmeFilename": "README.md",
+  "main": "./js/release/bluebird.js",
+  "webpack": "./js/release/bluebird.js",
+  "browser": "./js/browser/bluebird.js",
+  "files": [
+    "js/browser",
+    "js/release",
+    "LICENSE"
+  ]
+}

test/fixtures/bluebird/test.js

@@ -0,0 +1 @@
+require('bluebird')

test/parallel/test-require-invalid-main-no-exports.js

@@ -0,0 +1,20 @@
+'use strict';
+
+require('../common');
+
+// Test that a nonexistent "main" entry in a package.json that also omits an
+// "exports" entry will be ignored if it can be found in node_modules instead
+// rather than throwing.
+//
+// Throwing is perhaps "correct" behavior, but it will break bluebird tests
+// as of this writing.
+
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+const fixtures = require('../common/fixtures');
+
+const { error, status, stderr } =
+  spawnSync(process.execPath, [fixtures.path('bluebird', 'test.js')]);
+
+assert.ifError(error);
+assert.strictEqual(status, 0, stderr);