PhilipBrown\Signature\Tests\RequestTest::should_accept_custom_prefix PHP Method

    public function should_accept_custom_prefix()
    {
        $auth = $this->request->sign($this->token, 'x-');
        $this->assertEquals('5.1.2', $auth['x-version']);
        $this->assertEquals('abc123', $auth['x-key']);
        $this->assertEquals('1412506800', $auth['x-timestamp']);
        $this->assertRegExp('/[a-z0-9]{64}/', $auth['x-signature']);
    }