Fix tests

Author: kgryte

lib/node_modules/@stdlib/plot/components/svg/rug/test/test.color.js

@@ -58,10 +58,10 @@ tape( 'an instance supports setting and getting the property value (string)', fu
 		'autoRender': false,
 		'color': '#abc'
 	});
-	t.strictEqual( node.color, 'abc', 'returns expected value' );
+	t.strictEqual( node.color(), '#abc', 'returns expected value' );
 
 	node.color = '#cba';
-	t.strictEqual( node.color, '#cba', 'returns expected value' );
+	t.strictEqual( node.color(), '#cba', 'returns expected value' );
 
 	t.end();
 });