Time limited Code exercise to process robot movement instructions and determine final positions

No UI yet for this test, Components can be tested in AndroidStudio. Right click on app/src/test and select Run tests. The tests can also be run via gradle: gradle testDebug and the results will be found in the following location: MarsRobotExample/app/build/reports/tests/testDebugUnitTest/index.html

The core class is RobotPositionCommandProcessor.

We start with a list of command lines, use line 1 to define the planet bounds and drop this from the list. We then call a tail recursive function that consumes the list 3 lines at a time until all the commands are processed. During the recursion we build a list of results that we .joinToString() to produce the expected output.

fun processRobotCommandString(inputString: String): String {
val lines = inputString.lines()
val bounds = getBoundsInteractor(lines.first())

        return processRobotCommand(bounds = bounds, commands = lines.drop(1), results = emptyList())
            .joinToString(separator = "\n")
    }

Robot command processor class: Again using tail recursion to process each command, followed by a bounds check function to detect loss of robot. Loss of robot prevents further movements.

RobotCommandProcessor.kt

Test Data and Expected Result String:

private val TestInput = """
            53
            11E 
            RFRFRFRF
            
            32N 
            FRRFLLFFRRFLL
            
            03W 
            LLFFFLFLFL

        """.trimIndent()

        private val ExpectedOutput = """
            11E
            33NLOST
            33NLOST
        """.trimIndent()

See: TestRobotPositionCommandProcessor.kt