public void Should_calculate_instruction_length_from_start_index(string program, int startIndex, int expected)
{
var jumpIfFalseProgram = new JumpIfFalseProgram(new IntCodeValidator());
jumpIfFalseProgram.Process(program, startIndex);
Assert.That(jumpIfFalseProgram.InstructionLength, Is.EqualTo(expected));
}
public void Accepts_parameter_mode_immediate(string program, int expected)
{
var jumpIfFalseProgram = new JumpIfFalseProgram(new IntCodeValidator());
jumpIfFalseProgram.Process(program);
Assert.That(jumpIfFalseProgram.InstructionLength, Is.EqualTo(expected));
}
public void DoesNothing_when_parameter_is_not_zero(string program)
{
var jumpIfFalseProgram = new JumpIfFalseProgram(new IntCodeValidator());
Assert.That(jumpIfFalseProgram.Process(program), Is.EqualTo(string.Empty), "Program should not change");
Assert.That(jumpIfFalseProgram.InstructionLength, Is.EqualTo(3));
}
public void Should_validate_op_code_6(string program)
{
var jumpIfTrueProgram = new JumpIfFalseProgram(new IntCodeValidator());
var ex = Assert.Throws <InvalidOpCodeException>(() => jumpIfTrueProgram.Process(program));
Assert.That(ex.Message, Does.Contain("Invalid input: op code (first integer)"));
}
public void Sets_instruction_pointer_increment_to_move_to_position_given_at_index(string program, int expectedInputPosition)
{
var startIndex = 0;
var jumpProgram = new JumpIfFalseProgram(new IntCodeValidator());
jumpProgram.Process(program, startIndex);
startIndex += jumpProgram.InstructionLength;
Assert.That(startIndex, Is.EqualTo(expectedInputPosition));
}
public void Should_validate_input_is_a_valid_program()
{
var validatorSpy = A.Fake <IIntCodeValidator>();
var jumpIfTrue = new JumpIfFalseProgram(validatorSpy);
var program = "a,0,99,0";
A.CallTo(() => validatorSpy.SplitString(program)).Returns(new IntCodeValidator().SplitString(program));
Assert.Throws <Exception>(() => jumpIfTrue.Process(program));
A.CallTo(() => validatorSpy.Validate(program)).MustHaveHappened();
}