public IActionResult GetQuadraticEquation()
{
return(ControllerTryCatchBlocks.LoggingAllExceptions(logger, () =>
{
var equationGenerator = new QuadraticEquationGenerator(randomIntegerGenerator);
return Ok(equationGenerator.GenerateQuestionAndAnswer());
}));
}
public void CheckDoesNotThrowErrorWhenBoundsAreValid()
{
var parameters = new QuadraticEquationGeneratorParameters(aLowerBound: 4, aUpperBound: 5, bLowerBound: 765,
bUpperBound: 800, cLowerBound: -32, cUpperBound: -27);
var integerGenerator = new FixedRandomIntegerGenerator(5);
var equationGenerator = new QuadraticEquationGenerator(integerGenerator, parameters);
var equation = equationGenerator.GenerateQuestionAndAnswer();
}
public void ExpectRealSolutionsWhenAskedFor()
{
var integerGenerator = new FixedRandomIntegerGenerator(71);
var parameters = new QuadraticEquationGeneratorParameters(requireRealRoot: true);
var equationGenerator = new QuadraticEquationGenerator(integerGenerator, parameters);
var equation = equationGenerator.GenerateQuestionAndAnswer();
Assert.AreEqual(equation.Roots.Count(root => double.IsNaN(root)), 0);
}
public void TestLotsOfQuadraticEquations()
{
var integerGenerator = new FixedRandomIntegerGenerator(4243);
var equationGenerator = new QuadraticEquationGenerator(integerGenerator);
for (var i = 0; i < 1000000; i++)
{
var equation = equationGenerator.GenerateQuestionAndAnswer();
Assert.IsTrue(VerifySolutionIfSolutionIsReal(equation), $"{i}");
}
}
public void ExpectExceptionWhenUsingImpossibleCondition()
{
var integerGenerator = new FixedRandomIntegerGenerator(71);
// These parameters are mathematically impossible to fulfill as an equation
// with such coefficients will have a real root. This is because f(0)>0, f(x) -> infinity
// as |x| -> infinity
var parameters = new QuadraticEquationGeneratorParameters(aLowerBound: 1, cUpperBound: -1, requireComplexRoot: true);
var equationGenerator = new QuadraticEquationGenerator(integerGenerator, parameters);
equationGenerator.GenerateQuestionAndAnswer();
}
public void ExpectSameCoefficentsEveryTime()
{
var integerGenerator = new FixedRandomIntegerGenerator(10);
var parameters = new QuadraticEquationGeneratorParameters(aLowerBound: -10, aUpperBound: 10, bLowerBound: -100, bUpperBound: 100,
cLowerBound: -100, cUpperBound: 100);
var equationGenerator = new QuadraticEquationGenerator(integerGenerator, parameters);
var equation1 = equationGenerator.GenerateQuestionAndAnswer();
var equation2 = equationGenerator.GenerateQuestionAndAnswer();
var equation3 = equationGenerator.GenerateQuestionAndAnswer();
Assert.AreEqual(9, equation1.Coefficients[0]);
Assert.AreEqual(50, equation1.Coefficients[1]);
Assert.AreEqual(51, equation1.Coefficients[2]);
Assert.AreEqual(3, equation2.Coefficients[0]);
Assert.AreEqual(44, equation2.Coefficients[1]);
Assert.AreEqual(-41, equation2.Coefficients[2]);
Assert.AreEqual(-3, equation3.Coefficients[0]);
Assert.AreEqual(-9, equation3.Coefficients[1]);
Assert.AreEqual(-58, equation3.Coefficients[2]);
}
public IActionResult GetQuadraticEquation([FromBody] QuadraticEquationGeneratorParameters parameters)
{
if (!ModelState.IsValid)
{
return(BadRequest(ModelState));
}
return(ControllerTryCatchBlocks.ReturnBadRequestOnFailedToGenerateExceptionLoggingAllOthers(logger, () =>
{
var equationGenerator = new QuadraticEquationGenerator(randomIntegerGenerator, parameters);
return Ok(equationGenerator.GenerateQuestionAndAnswer());
},
BadRequest, parameters));
}