public void SignOut_With_Null_Parameter_Should_Throw_ArgumentNullException()
{
var service = new CollaboratorsService();
Func <ValueTask> act = () => service.SignOut(null);
act.Should().ThrowExactly <ArgumentNullException>();
}
public async Task SignOut_With_Not_Null_Parameter_Collaborators_Should_Not_Contain_It(string userName)
{
var service = new CollaboratorsService();
var identityUser = new IdentityUser {
Id = userName, NormalizedUserName = userName
};
var collaborator = await service.SignIn(identityUser);
await service.SignOut(identityUser);
service.Collaborators.Should().NotContain(collaborator);
}