public void Parse_OnlyFirstAndSecondCoefficients()
{
//arrange
string equation = "3x^2 + 4x";
EquationSolver equationSolver = new EquationSolver();
//act
double[] coefficients = equationSolver.Parse(equation);
//assert
Assert.AreEqual(new double[] { 3, 4, 0 }, coefficients);
}
public void Parse_ThreeUnitCoefficients()
{
//arrange
string equation = "x^2 + x - 1";
EquationSolver equationSolver = new EquationSolver();
//act
double[] coefficients = equationSolver.Parse(equation);
//assert
Assert.AreEqual(new double[] { 1, 1, -1 }, coefficients);
}
public void Parse_ThreePositiveIntegerCoefficients()
{
//arrange
string equation = "2x^2 + 4x + 8";
EquationSolver equationSolver = new EquationSolver();
//act
double[] coefficients = equationSolver.Parse(equation);
//assert
Assert.AreEqual(2, coefficients[0]);
Assert.AreEqual(4, coefficients[1]);
Assert.AreEqual(8, coefficients[2]);
}
public void Parse_ThreeBigCoefficients()
{
//arrange
string equation = "-256000x^2 + 1281024.89000014x + 999999999.999999";
EquationSolver equationSolver = new EquationSolver();
//act
double[] coefficients = equationSolver.Parse(equation);
//assert
Assert.AreEqual(-256000, coefficients[0]);
Assert.AreEqual(1281024.89000014, coefficients[1]);
Assert.AreEqual(999999999.999999, coefficients[2]);
}
public void Parse_ThreeDoubleCoefficients()
{
//arrange
string equation = "-6,2x^2 - 10,14x + 20,256";
EquationSolver equationSolver = new EquationSolver();
//act
double[] coefficients = equationSolver.Parse(equation);
//assert
Assert.AreEqual(-6.2, coefficients[0]);
Assert.AreEqual(-10.14, coefficients[1]);
Assert.AreEqual(20.256, coefficients[2]);
}
public void Parse_ThreeNegativeIntegerCoefficients()
{
//arrange
string equation = "-6x^2 - 10x - 20";
EquationSolver equationSolver = new EquationSolver();
//act
double[] coefficients = equationSolver.Parse(equation);
//assert
Assert.AreEqual(-6, coefficients[0]);
Assert.AreEqual(-10, coefficients[1]);
Assert.AreEqual(-20, coefficients[2]);
}
