/**
* Tests whether the toString provides a valid GraphViz attribute string.
*
* @return void
*/
public function testToString()
{
$this->fixture = new Attribute('a', 'b');
$this->assertSame('a="b"', (string) $this->fixture, 'Strings should be surrounded with quotes');
$this->fixture->setValue('a"a');
$this->assertSame('a="a\\"a"', (string) $this->fixture, 'Strings should be surrounded with quotes');
$this->fixture->setKey('url');
$this->assertSame('URL="a\\"a"', (string) $this->fixture, 'The key named URL must be uppercased');
$this->fixture->setValue('<a>test</a>');
$this->assertSame('URL=<a>test</a>', (string) $this->fixture, 'HTML strings should not be surrounded with quotes');
}
