public void ToString_NullCommandName_ReturnsMessage()
{
// arrange
var sut = new InvalidCommandNameException(null);
// act
var result = sut.ToString();
// assert
Assert.Equal("The command name null is invalid", result);
}
public void ToString_WhenCalled_ReturnsMessage()
{
// arrange
var sut = new InvalidCommandNameException("bad name");
// act
var result = sut.ToString();
// assert
Assert.Equal("The command name 'bad name' is invalid", result);
}