public static function assertJsonFileNotEqualsJsonFile($expectedFile, $actualFile, $message = '')
{
static::assertFileExists($expectedFile, $message);
static::assertFileExists($actualFile, $message);
$actualJson = file_get_contents($actualFile);
$expectedJson = file_get_contents($expectedFile);
static::assertJson($expectedJson, $message);
static::assertJson($actualJson, $message);
// call constraint
$constraintExpected = new PHPUnit_Framework_Constraint_JsonMatches($expectedJson);
$constraintActual = new PHPUnit_Framework_Constraint_JsonMatches($actualJson);
static::assertThat($expectedJson, new PHPUnit_Framework_Constraint_Not($constraintActual), $message);
static::assertThat($actualJson, new PHPUnit_Framework_Constraint_Not($constraintExpected), $message);
}