From 3704db3dcee711e129f171011da84abf689d87e0 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Mon, 2 Mar 2020 12:21:14 +0100
Subject: [PATCH] test: use index.js if package.json "main" is empty

Verify that the module loader uses index.js when the "main" property of
package.json is the empty string.

Refs: https://github.com/nodejs/node/issues/32013
---
 test/fixtures/require-empty-main/index.js     |  2 ++
 test/fixtures/require-empty-main/package.json |  1 +
 test/parallel/test-require-empty-main.js      | 25 +++++++++++++++++++
 3 files changed, 28 insertions(+)
 create mode 100644 test/fixtures/require-empty-main/index.js
 create mode 100644 test/fixtures/require-empty-main/package.json
 create mode 100644 test/parallel/test-require-empty-main.js

diff --git a/test/fixtures/require-empty-main/index.js b/test/fixtures/require-empty-main/index.js
new file mode 100644
index 00000000000000..d2ed2dd2202c19
--- /dev/null
+++ b/test/fixtures/require-empty-main/index.js
@@ -0,0 +1,2 @@
+'use strict';
+module.exports = 42;
diff --git a/test/fixtures/require-empty-main/package.json b/test/fixtures/require-empty-main/package.json
new file mode 100644
index 00000000000000..3f0b7c677acf3c
--- /dev/null
+++ b/test/fixtures/require-empty-main/package.json
@@ -0,0 +1 @@
+{"main":""}
diff --git a/test/parallel/test-require-empty-main.js b/test/parallel/test-require-empty-main.js
new file mode 100644
index 00000000000000..73f141d1f9ea8f
--- /dev/null
+++ b/test/parallel/test-require-empty-main.js
@@ -0,0 +1,25 @@
+'use strict';
+require('../common');
+
+// A package.json with an empty "main" property should use index.js if present.
+// require.resolve() should resolve to index.js for the same reason.
+//
+// In fact, any "main" property that doesn't resolve to a file should result
+// in index.js being used, but that's already checked for by other tests.
+// This test only concerns itself with the empty string.
+
+const assert = require('assert');
+const path = require('path');
+const fixtures = require('../common/fixtures');
+
+const where = fixtures.path('require-empty-main');
+const expected = path.join(where, 'index.js');
+
+test();
+setImmediate(test);
+
+function test() {
+  assert.strictEqual(require.resolve(where), expected);
+  assert.strictEqual(require(where), 42);
+  assert.strictEqual(require.resolve(where), expected);
+}