public void ShouldReturnApplicationIdIfConfigurationFileExists(Mock<IFileSystem> fileSystem, TextWriter writer, IGitRepositoryConfigurer repositoryConfigurer, string applicationName)
{
var configurationFile = ConfigurationFile;
var stream = new MemoryStream(Encoding.Default.GetBytes(applicationName));
fileSystem.Setup(x => x.OpenRead(configurationFile)).Returns(stream);
var applicationConfiguration = new ApplicationConfiguration(fileSystem.Object, repositoryConfigurer, writer);
Assert.Equal(applicationName, applicationConfiguration.GetApplicationId());
}