public void GenerateProblemsWithOptionalParameters()
{
var service = new MathService();
var expectedProblems = 4;
var minOperations = 2;
var maxOperations = 3;
var expressions = service.Generate(expectedProblems, minOperations, maxOperations);
var problems = expressions.Split('\n');
problems = problems.Take(problems.Length - 1).ToArray();
foreach (var problem in problems)
{
var count1 = problem.Distinct().Count(x => x == '+');
var count2 = problem.Distinct().Count(x => x == '-');
var count3 = problem.Distinct().Count(x => x == '*');
var count4 = problem.Distinct().Count(x => x == '/');
var count = count1 + count2 + count3 + count4;
Assert.IsTrue(minOperations <= count && maxOperations >= count);
}
}
public void GenerateZeroProblems()
{
var service = new MathService();
var expressions = service.Generate(0, null, null);
Assert.AreEqual("No problems to generate", expressions);
}
public void GenerateNegativeProblems()
{
var service = new MathService();
var expectedProblems = -4;
var expressions = service.Generate(expectedProblems, null, null);
}
public void OutOfRangeMinOperations()
{
var service = new MathService();
var expectedProblems = 4;
var minOperations = -2;
var expressions = service.Generate(expectedProblems, minOperations, null);
}
public void MinOperationsGreaterThanMaxOperations()
{
var service = new MathService();
var expectedProblems = 4;
var minOperations = 3;
var maxOperations = 1;
var expressions = service.Generate(expectedProblems, minOperations, maxOperations);
}
public void GenerateDivideByZeroProblem()
{
var service = new MathService();
var expectedProblems = 20;
var expressions = service.Generate(expectedProblems, null, null);
var indexOfZero = expressions.IndexOf("/ 0", StringComparison.Ordinal);
Assert.AreEqual(-1, indexOfZero);
}
public void GenerateProblems()
{
var service = new MathService();
var expectedProblems = 4;
var expressions = service.Generate(expectedProblems, null, null);
var numProblems = expressions.Split('\n').Length - 1;
Assert.AreEqual(expectedProblems, numProblems);
}