public void Given_NullSettings_GetOAuthTokenFromAad_ShouldThrow_Exception()
{
var settings = new Mock <ICostMonitoringSettings>();
var wrapper = new AzureAuthenticationHelperWrapper();
Action action = () => { var result = wrapper.GetOAuthTokenFromAad(null); };
action.ShouldThrow <ArgumentNullException>();
action = () => { var result = wrapper.GetOAuthTokenFromAad(settings.Object); };
action.ShouldThrow <InvalidOperationException>();
settings.SetupGet(p => p.Authentication).Returns(new AuthenticationSettings());
action = () => { var result = wrapper.GetOAuthTokenFromAad(settings.Object); };
action.ShouldThrow <InvalidOperationException>();
}
