Help to solve unit test task 1

Question

Hello i have been looking on this task for a while now, and have no clue on how to solve it is there any solution for this task?

thanks in advance

Map.cs

namespace TreehouseDefense
{
    public class Map
    {
        public readonly int Width;
        public readonly int Height;

        public Map(int width, int height)
        {
            if(width < 1 || height < 1)
            {
                throw new System.ArgumentOutOfRangeException(
                    "Map must be at least 1x1");
            }

            Width = width;
            Height = height;
        }

        public bool OnMap(Point point)
        {
            return point.X >= 0 && point.X < Width && 
                   point.Y >= 0 && point.Y < Height;
        }
    }
}

MapTests.cs

using Xunit;

namespace TreehouseDefense.Tests
{
    public class MapTests
    {
        [Fact]
        public void OnMapTest()
        {
            Assert.True(false, "This test needs an implementation");
        }
    }
}

Point.cs

using System;

namespace TreehouseDefense
{
    public class Point
    {
        public readonly int X;
        public readonly int Y;

        public Point(int x, int y)
        {
            X = x;
            Y = y;
        }

        public double DistanceTo(Point point)
        {
            return Math.Sqrt(Math.Pow(X - point.X, 2.0) + Math.Pow(Y - point.Y, 2.0));
        }
    }
}

Answer 1 · 2017-02-10T19:40:47Z

February 10, 2017 7:40pm

Sam,

Just for reference, here are the instructions for the code challenge:

"Fill out MapTests.OnMapTest to test that Map.OnMap returns true when passed a point that is on the map."

To start, think about what you need to do in order to successfully call the Map.OnMap method. Do you need to instantiate an instance of the Map class? What do you need to pass to the OnMap method?

Once you have the code written to call the Map.OnMap method, then think about the property values that the Map and Point objects need to have in order for the OnMap method to return a value of true. Then, once you have the OnMap method returning a value of true, you can use the Assert.True method to validate that the OnMap method's return value is in fact the expected value of true.

I hope this helps :)

Thanks ~James

Answer 2 · 2017-03-23T16:35:07Z

March 23, 2017 4:35pm

It helped me to think about it from Assert to Arrange. Assert-

Assert.True(result);

The result parameter of the assertion (Assert.True) comes from the method tested in Act-

var result = mapInstance.OnMap(parameter);

The mapInstance is instantiated in Arrange. The parameter of the OnMap method is initialized in Arrange-

//1) use the new keyword to instantiate Map
Map yourMap = new Map(yourMapWidth, yourMapHeight);

//2) initialize x and y for yourPoint

//3) instantiate yourPoint using x and y just like you instantiated yourMap

Of course, your code must follow the order Arrange, Act, then Assert. Ask yourself what the method's signature is (it's name and what type of parameter or parameters it takes) and what it returns. That is why the Map and Point class are so helpful.

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Sam Simion

Sam Simion

Help to solve unit test task 1

2 Answers

James Churchill

James Churchill

Steven Barkley

Steven Barkley

johnamann

johnamann