/**
* Removes a key/value pair
*
* @param string $key The key
*
* @return void
*/
public function offsetUnset($key)
{
assert(Validate::isString($key), sprintf('Invalid metadata key: (%s) %s', gettype($key), VarPrinter::toString($key)));
$this->remove($key);
}
/**
* @dataProvider invalidStringProvider
*/
public function test_that_is_string_returns_false_for_invalid_value($value)
{
$this->assertFalse(Validate::isString($value));
}