public async Task WhiteListsConfigured_Should_ReplyMessageWithWhiteList() { // Arrange var channelConfigurationServiceMock = new Mock <IDiscordChannelConfigService>(); var command = new WhiteListCommand(channelConfigurationServiceMock.Object); const string replyMessage = "Whitelist Words"; var chatConfig = new DiscordChannelConfig { WhiteListWords = new() { "Word" } }; var channelMock = new Mock <IMessageChannel>(); var user = new Mock <IGuildUser>(); user.Setup(v => v.GuildPermissions).Returns(GuildPermissions.All); var message = new Mock <IMessage>(); message.Setup(v => v.Author).Returns(user.Object); message.Setup(v => v.Channel).Returns(channelMock.Object); channelConfigurationServiceMock.Setup(v => v.GetConfigurationByChannelId(message.Object.Channel.Id)) .ReturnsAsync(chatConfig); // Act await command.Handle(message.Object); // Assert // Verify SendMessageAsync was called with the reply message "Whitelist Words" channelMock.Verify(v => v.SendMessageAsync(null, false, It.Is <Embed>(e => e.Description.Contains(replyMessage)), null, null, null, null, null, null, MessageFlags.None)); } }