public void CorrectIndexing()
{
int n = 3;
SysOfLinearEquation s = new SysOfLinearEquation(n);
s.Add(new LinearEquation("1, 2, 3, 15"));
s.Add(new LinearEquation("2, 4, 3, 20"));
s.Add(new LinearEquation("5, 6, 7, 33"));
Assert.AreEqual(new LinearEquation("2, 4, 3, 20"), s[1]);
}
public void FailWithIndexing1()
{
int n = 3;
SysOfLinearEquation s = new SysOfLinearEquation(n);
s.Add(new LinearEquation("1, 2, 3, 15"));
s.Add(new LinearEquation("2, 4, 3, 20"));
s.Add(new LinearEquation("5, 6, 7, 33"));
Assert.Equals(typeof(IndexOutOfRangeException), s[-1]);
}
public void FailWithIndexing2()
{
int n = 3;
SysOfLinearEquation s = new SysOfLinearEquation(n);
s.Add(new LinearEquation("1, 2, 3, 10"));
s.Add(new LinearEquation("4, 5, 6, 20"));
s.Add(new LinearEquation("7, 8, 9, 30"));
Assert.Equals(typeof(IndexOutOfRangeException), s[12]);
}
public void InfinitelyManySolutions()
{
int n = 3;
SysOfLinearEquation s = new SysOfLinearEquation(n);
s.Add(new LinearEquation("3, 2,-4, 7"));
s.Add(new LinearEquation("6, 4, -8, 15"));
s.Add(new LinearEquation("6, 4, -8, 15"));
s.StepUp();
Assert.Equals(typeof(ArgumentException), s.Solve());
}
public void CorrectAnswer()
{
int n = 3;
SysOfLinearEquation s = new SysOfLinearEquation(n);
s.Add(new LinearEquation("3, 2, -4, 3"));
s.Add(new LinearEquation("2, 3, 3, 15"));
s.Add(new LinearEquation("5, -3, 1, 14"));
s.StepUp();
double[] solve1 = new double[] { 3, 1, 2 };
double[] solve2 = s.Solve();
bool check = true;
for (int i = 0; i < n; i++)
{
if (Math.Abs(solve1[i] - solve2[i]) > 1e-9)
{
check = false;
}
}
Assert.AreEqual(true, check);
}