public void WithoutSolution()
{
// [Test a set which contains no solution]
/* Goal: 2. No route.
* 1
*/
var nodeWithoutSolution = new BinaryTreeNode <int>(1);
Assert.IsNull(BinaryTreePathSum.Algorithm(nodeWithoutSolution, 2));
}
public void WithSolution()
{
// [Test a set which contains a solution]
/* Goal: 2. Root, left.
* 1
* 1 0
* 0
*/
var nodeWithSolution = new BinaryTreeNode <int>(1)
{
Left = new BinaryTreeNode <int>(1)
};
var solutionResult = BinaryTreePathSum.Algorithm(nodeWithSolution, 2);
Assert.IsNotNull(solutionResult);
Assert.AreEqual(2, solutionResult.Count);
}
public void IntBoundaries()
{
// [Testing int boundaries]
// Create nodes that will cause wrapping since C# handles overflow by default this way
// 2147483647 += 1 == -2147483648
// 2147483648 -= 1 == 2147483647
var overflowNodeNegative = new BinaryTreeNode <int>(int.MaxValue)
{
Left = new BinaryTreeNode <int>(1)
};
var overflowNodePositive = new BinaryTreeNode <int>(int.MinValue)
{
Left = new BinaryTreeNode <int>(-1)
};
Assert.IsNull(BinaryTreePathSum.Algorithm(overflowNodeNegative, int.MinValue));
Assert.IsNull(BinaryTreePathSum.Algorithm(overflowNodePositive, int.MaxValue));
}
public void SubOptimalSolution()
{
// [Test a set which contains an optimal and sub-optimal solution]
/* Goal: 10. Root, left, left, for a total of 3 steps. Root, right, for a total of 2 steps.
* 1
* 1 10
* 8 1
*/
var nodeWithSubOptimalSolution = new BinaryTreeNode <int>(1)
{
Left = new BinaryTreeNode <int>(1), Right = new BinaryTreeNode <int>(10)
};
nodeWithSubOptimalSolution.Left.Left = new BinaryTreeNode <int>(8);
nodeWithSubOptimalSolution.Left.Right = new BinaryTreeNode <int>(1);
var subOptimalSolutionResult = BinaryTreePathSum.Algorithm(nodeWithSubOptimalSolution, 11);
Assert.IsNotNull(subOptimalSolutionResult);
Assert.AreEqual(2, subOptimalSolutionResult.Count);
}
public void NullRef()
{
// [Test 'null' for ref types]
Assert.IsNull(BinaryTreePathSum.Algorithm(null, 1));
}