diff --git a/tests/phpunit/tests/l10n.php b/tests/phpunit/tests/l10n.php
index 3f195ca..09ba546 100644
--- a/tests/phpunit/tests/l10n.php
+++ b/tests/phpunit/tests/l10n.php
@@ -16,4 +16,16 @@ class Tests_L10n extends WP_UnitTestCase {
 		$this->assertTrue( unload_textdomain( 'wp-tests-domain' ) );
 		$this->assertFalse( is_textdomain_loaded( 'wp-tests-domain' ) );
 	}
+
+	/**
+	 * @ticket 21319
+	 */
+	function test_is_textdomain_loaded_for_no_translations() {
+		$this->assertFalse( load_textdomain( 'wp-tests-domain', DIR_TESTDATA . '/non-existent-file' ) );
+		$this->assertFalse( is_textdomain_loaded( 'wp-tests-domain' ) );
+		$this->assertInstanceOf( 'NOOP_Translations', get_translations_for_domain( 'wp-tests-domain' ) );
+		// Ensure that we don't confuse NOOP_Translations to be a loaded text domain.
+		$this->assertFalse( is_textdomain_loaded( 'wp-tests-domain' ) );
+		$this->assertFalse( unload_textdomain( 'wp-tests-domain' ) );
+	}
 }
\ No newline at end of file