diff --git a/tests/Polyfills/AssertIsTypeTest.php b/tests/Polyfills/AssertIsTypeTest.php
index 9b859b2..9c0529b 100644
--- a/tests/Polyfills/AssertIsTypeTest.php
+++ b/tests/Polyfills/AssertIsTypeTest.php
@@ -80,6 +80,18 @@ public function testAssertIsResource() {
 		\closedir( $resource );
 	}
 
+	/**
+	 * Verify assertIsResource() method handles closed resources correctly.
+	 *
+	 * @return void
+	 */
+	public function testAssertIsResourceAllowsForClosedResources() {
+		$resource = \opendir( __DIR__ );
+		\closedir( $resource );
+
+		$this->assertIsResource( $resource );
+	}
+
 	/**
 	 * Verify availability of the assertIsArray() method.
 	 *