public void equation_with_variable_and_null_argument()
{
var formula = new Formula("a+5");
formula.IsValid.ShouldBeTrue();
Assert.Throws<MathException>(() => formula.Evaluate());
}
public void invalid_formula_bracket_closed_before_opened()
{
var formula = new Formula(")5 + 7(*5");
formula.IsValid.ShouldBeFalse();
Assert.Throws<MathException>(() => formula.Evaluate());
}
public void equation_with_two_variables_and_argument_with_one_value()
{
var formula = new Formula("a*(5-b)");
formula.IsValid.ShouldBeTrue();
Assert.Throws<MathException>(() => formula.Evaluate(new { a = 7 }));
}
public void equation_with_variable()
{
var formula = new Formula("a+5");
formula.IsValid.ShouldBeTrue();
formula.Evaluate(new { a = 7 }).ShouldEqual(12);
}
public void decimal_formula()
{
var formula = new Formula("-5.5*2 + 24 - 0.25*4");
formula.IsValid.ShouldBeTrue();
formula.Evaluate().ShouldEqual(12);
}
public void equation_with_two_variables()
{
var formula = new Formula("a*(5-b)");
formula.IsValid.ShouldBeTrue();
formula.Evaluate(new { a = 10, b = 3 }).ShouldEqual(20);
}
public void complex_formula()
{
var formula = new Formula("-12*3 + (5-3)*6 + 9/(4-1)");
formula.IsValid.ShouldBeTrue();
formula.Evaluate().ShouldEqual(-21);
}
public void invalid_formula_not_closed_bracket()
{
var formula = new Formula("5 + 7 + ( (3*5) + 2");
formula.IsValid.ShouldBeFalse();
Assert.Throws<MathException>(() => formula.Evaluate());
}
public void invalid_formula_empty_bracket()
{
var formula = new Formula("5 + 7 + () + 3");
formula.IsValid.ShouldBeFalse();
Assert.Throws<MathException>(() => formula.Evaluate());
}
public void operator _order()
{
var formula = new Formula("5 * 5 + 7 * 3");
formula.IsValid.ShouldBeTrue();
formula.Evaluate().ShouldEqual(46);
}
public void simple_addition()
{
var formula = new Formula("5 + 7");
formula.IsValid.ShouldBeTrue();
formula.Evaluate().ShouldEqual(12);
}
public void invalid_formula_two_operators_in_row()
{
var formula = new Formula("5 + 7 ++ 5");
formula.IsValid.ShouldBeFalse();
Assert.Throws<MathException>(() => formula.Evaluate());
}
public void invalid_formula_two_negations_in_row()
{
var formula = new Formula("--5 + 7");
formula.IsValid.ShouldBeFalse();
Assert.Throws<MathException>(() => formula.Evaluate());
}
public void invalid_formula_operator_left_at_the_end()
{
var formula = new Formula("5 + 7 +");
formula.IsValid.ShouldBeFalse();
Assert.Throws<MathException>(() => formula.Evaluate());
}
public void invalid_formula_operator_in_wrong_place()
{
var formula = new Formula("5 + 7 + (+2 - 3)");
formula.IsValid.ShouldBeFalse();
Assert.Throws<MathException>(() => formula.Evaluate());
}