public void FollowInvalidUserTest()
{
// act
string input = "Charlie follows Alice";
_userManagerMock.Setup(x => x.GetUserByUsername("Charlie", true)).Returns(new User());
_userManagerMock.Setup(x => x.GetUserByUsername("Alice", true)).Throws(new NullReferenceException("Alice does not exists!"));
var follow = new Follow(_userManagerMock.Object);
// actual
var actual = follow.Perform(input);
// assert
Assert.AreEqual(actual, "Alice does not exists!");
}
public void FollowAlreadyFollowedUserTest()
{
// act
string input = "Charlie follows Alice";
var parent = new User { Username = "******" };
var child = new User { Username = "******" };
var children = new List<User> { child };
_userManagerMock.Setup(x => x.GetUserByUsername(parent.Username, true)).Returns(parent);
_userManagerMock.Setup(x => x.GetUserByUsername(child.Username, true)).Returns(child);
_userManagerMock.Setup(x => x.CheckFollowerExists(parent, child)).Throws(new Exception("Alice already followed!"));
var follow = new Follow(_userManagerMock.Object);
// actual
var actual = follow.Perform(input);
// assert
Assert.AreEqual(actual, "Alice already followed!");
}
public void FollowMultipleNewUserTest()
{
// act
string input = "Charlie follows Alice";
var parent = new User { Username = "******" };
var child = new User { Username = "******" };
_userManagerMock.Setup(x => x.GetUserByUsername(parent.Username, true)).Returns(parent);
_userManagerMock.Setup(x => x.GetUserByUsername(child.Username, true)).Returns(child);
_userManagerMock.Setup(x => x.CheckFollowerExists(parent, child));
_userManagerMock.Setup(x => x.FollowUser(parent, child));
var follow = new Follow(_userManagerMock.Object);
// actual
var actual = follow.Perform(input);
// assert
Assert.AreEqual(actual, string.Empty);
_userManagerMock.Verify(x => x.FollowUser(parent, child), Times.Once);
}