diff --git a/lib/node_modules/@stdlib/math/base/special/cosd/test/test.js b/lib/node_modules/@stdlib/math/base/special/cosd/test/test.js
index bb4a31ed9bc3..6e9affb0a345 100644
--- a/lib/node_modules/@stdlib/math/base/special/cosd/test/test.js
+++ b/lib/node_modules/@stdlib/math/base/special/cosd/test/test.js
@@ -114,3 +114,15 @@ tape( 'if provided `90.0`, the function returns `0.0`', function test( t ) {
 	t.strictEqual( v, 0.0, 'returns expected value' );
 	t.end();
 });
+
+tape( 'the function returns `1` if provided `+-0`', function test( t ) {
+	var v;
+
+	v = cosd( -0.0 );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	v = cosd( +0.0 );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	t.end();
+});
diff --git a/lib/node_modules/@stdlib/math/base/special/cosd/test/test.native.js b/lib/node_modules/@stdlib/math/base/special/cosd/test/test.native.js
index 45e500584d46..49e355c87cb4 100644
--- a/lib/node_modules/@stdlib/math/base/special/cosd/test/test.native.js
+++ b/lib/node_modules/@stdlib/math/base/special/cosd/test/test.native.js
@@ -123,3 +123,15 @@ tape( 'if provided `90.0`, the function returns `0.0`', opts, function test( t )
 	t.strictEqual( v, 0.0, 'returns expected value' );
 	t.end();
 });
+
+tape( 'the function returns `1` if provided `+-0`', opts, function test( t ) {
+	var v;
+
+	v = cosd( -0.0 );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	v = cosd( +0.0 );
+	t.strictEqual( v, 1.0, 'returns expected value' );
+
+	t.end();
+});