public void WhenWalkingStreightandBack_IshouldGetAValidRoute()
    {
        //Arrange
        WalkAlgorithm algorithm = new WalkAlgorithm();
        string        from      = "Abcd";
        string        to        = "Dcba";
        string        path      = "Abcd,Bbc,Cda,Dcba";
        string        pathBack  = "Dcba,Cda,Bbc,Abcd";

        //Act
        var route     = algorithm.execute(from, to);
        var routeBack = algorithm.execute(to, from);

        //Assert
        Assert.IsNotNull(route);
        Assert.AreEqual(path, route.RoutePath);

        Assert.IsNotNull(routeBack);
        Assert.AreEqual(pathBack, routeBack.RoutePath);
    }
    public void WhenWalkingFromAtoD_IshouldGetAValidRoute()
    {
        //Arrange
        WalkAlgorithm algorithm = new WalkAlgorithm();
        string        from      = "A";
        string        to        = "D";
        string        path      = "A,B,C,D";

        //Act
        var route = algorithm.execute(from, to);

        //Assert
        Assert.IsNotNull(route);
        Assert.AreEqual(path, route.RoutePath);
    }