private long GetFirstTriangleNumberWithAtLeastNDivisor(int requiredNumberOfDivisors)
{
int n = 1;
var nthTriangleNumber = TriangleNumberHelper.GetNthTriangleNumber(n);
while (DivisorHelper.GetNumberOfDivisors(nthTriangleNumber) < requiredNumberOfDivisors)
{
n++;
nthTriangleNumber = TriangleNumberHelper.GetNthTriangleNumber(n);
}
return(nthTriangleNumber);
}
public void GetNthTriangleNumber_ReturnsCorrectResult(int n, long nthTriangleNumber)
{
TriangleNumberHelper.GetNthTriangleNumber(n).Should().Be(nthTriangleNumber);
}