public async Task TestThat_SendMessage_When_MessageIsNull_Throws_ArgumentNullException()
{
// Arrange
var dataWriterMock = new Mock <IMessageDataWriter>();
var outputMessageRepository = new OutputMessageRepository(dataWriterMock.Object);
// Act
async Task Act() => await outputMessageRepository.SendMessage(MockObjects.NullMessage);
// Assert
await Assert.ThrowsAsync <ArgumentNullException>(Act);
}
public async Task TestThat_SendMessage_When_MessageIsValid_Calls_DataWriterWriteMessage_Once()
{
// Arrange
var dataWriterMock = new Mock <IMessageDataWriter>();
var mockMessage = MockObjects.ValidMessage;
var outputMessageRepository = new OutputMessageRepository(dataWriterMock.Object);
// Act
await outputMessageRepository.SendMessage(mockMessage);
// Assert
dataWriterMock.Verify(x => x.WriteMessage(mockMessage), Times.Once);
}
public async Task TestThat_SendMessage_When_DataWriterThrowsException_Throws_SameException()
{
// Arrange
var mockException = MockObjects.GenericException;
var dataWriterMock = new Mock <IMessageDataWriter>();
dataWriterMock
.Setup(x => x.WriteMessage(It.IsAny <string>()))
.Throws(mockException);
var outputMessageRepository = new OutputMessageRepository(dataWriterMock.Object);
// Act
async Task Act() => await outputMessageRepository.SendMessage(MockObjects.ValidMessage);
// Assert
var exception = await Assert.ThrowsAnyAsync <Exception>(Act);
Assert.Equal(mockException, exception);
}