public void Solve_WhenSingleSolution_ThenSolution()
{
//given
var testObject = new EquationSystem(
new[] { new Equation(new[] { 2.0, 3.0, -2.0 }, 15),
new Equation(new[] { 7.0, -1.0, 0.0 }, 4),
new Equation(new[] { -1.0, 6.0, 4.0 }, 9) });
// when
double[] result = testObject.Solve();
// then
result.Should().Equal(new[] { 1.0, 3.0, -2.0 });
testObject.IsSolution(result).Should().BeTrue();
testObject.IsSolution(new[] { -2.0, -18.0, -36.5 }).Should().BeFalse();
}
public void Solve_WhenInfiniteSolutions_ThenInfiniteSolutionsException()
{
// given
var testObject = new EquationSystem(new Equation[] {
new Equation(new[] { 2.0, 3.0, -2.0 }, 15),
new Equation(new[] { 7.0, -1.0, 0.0 }, 4),
new Equation(new[] { 4.0, 6.0, -4.0 }, 30)
});
// when
Action action = () => testObject.Solve();
// then
action.Should().Throw <InfiniteSolutionsException>();
testObject.IsSolution(new[] { 1.0, 3.0, -2.0 }).Should().BeTrue();
testObject.IsSolution(new[] { -2.0, -18.0, -36.5 }).Should().BeTrue();
}
public void Solve_WhenNoSolution_ThenNoSolutionException()
{
// given
var testObject = new EquationSystem(new Equation[] {
new Equation(new[] { 2.0, 3.0, -2.0 }, 15),
new Equation(new[] { 7.0, -1.0, 0.0 }, 4),
new Equation(new[] { -1.0, -1.5, 1.0 }, -1)
});
// when
Action action = () => testObject.Solve();
// then
action.Should().Throw <NoSolutionException>();
testObject.IsSolution(new[] { 1.0, 3.0, -2.0 }).Should().BeFalse();
testObject.IsSolution(new[] { -2.0, -18.0, -36.5 }).Should().BeFalse();
}