public function testValidateUserWithNullOrEmptyUserAgentDefaultToUnknown()
{
$user = new AdWordsUser($this->authIniFilePath, 'devToken', '', null, null, $this->mockOAuth2Credential);
$user->validateUser();
$this->assertEquals($user->GetUserAgent(), 'unknown');
$user = new AdWordsUser($this->authIniFilePath, 'devToken', null, null, null, $this->mockOAuth2Credential);
$user->validateUser();
$this->assertEquals($user->GetUserAgent(), 'unknown');
}