From 2a548a95e7409e9fbbd1f0b972aad57f25764cae Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Thu, 22 Aug 2024 10:47:16 -0700
Subject: [PATCH] [Tests] `utils.merge`: add some coverage

---
 test/utils.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/test/utils.js b/test/utils.js
index aa84dfdc..21429937 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -28,6 +28,20 @@ test('merge()', function (t) {
     var noOptionsNonObjectSource = utils.merge({ foo: 'baz' }, 'bar');
     t.deepEqual(noOptionsNonObjectSource, { foo: 'baz', bar: true });
 
+    var func = function f() {};
+    t.deepEqual(
+        utils.merge(func, { foo: 'bar' }),
+        [func, { foo: 'bar' }],
+        'functions can not be merged into'
+    );
+
+    func.bar = 'baz';
+    t.deepEqual(
+        utils.merge({ foo: 'bar' }, func),
+        { foo: 'bar', 'function f() {}': true },
+        'functions can not be merge sources'
+    );
+
     t.test(
         'avoids invoking array setters unnecessarily',
         { skip: typeof Object.defineProperty !== 'function' },