TestCase("0;0 1;1 0;1 1;0 4;0 0;0", 100, ExpectedResult=new char[0])

Nothing is told about such cases in the description.

Could anybody help me to understand the question better?
Is the question finding a direction to see the target, meaning that there isn't any block that isn't any other box align before on that direction before the box we want to find?

I am unable to pass the test case with this preset, while I have checked the test case manually that my code works as expected.