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-rw-r--r--test/parallel/test-util.js3
1 files changed, 3 insertions, 0 deletions
diff --git a/test/parallel/test-util.js b/test/parallel/test-util.js
index 337cb789f7..2f91417d10 100644
--- a/test/parallel/test-util.js
+++ b/test/parallel/test-util.js
@@ -113,14 +113,17 @@ assert.strictEqual(util.isBoolean(false), true);
assert.strictEqual(util.isBoolean('string'), false);
assert.strictEqual(util.isNull(null), true);
+assert.strictEqual(util.isNull(undefined), false);
assert.strictEqual(util.isNull(), false);
assert.strictEqual(util.isNull('string'), false);
+assert.strictEqual(util.isUndefined(undefined), true);
assert.strictEqual(util.isUndefined(), true);
assert.strictEqual(util.isUndefined(null), false);
assert.strictEqual(util.isUndefined('string'), false);
assert.strictEqual(util.isNullOrUndefined(null), true);
+assert.strictEqual(util.isNullOrUndefined(undefined), true);
assert.strictEqual(util.isNullOrUndefined(), true);
assert.strictEqual(util.isNullOrUndefined('string'), false);