public void Mutate()
{
var random = Substitute.For <SecureRandom>();
var nextCallCount = 0;
random.Next(Arg.Any <int>()).Returns((_) =>
{
var result = 0;
if (nextCallCount == 0)
{
result = 1;
}
else if (nextCallCount == 1)
{
result = 0;
}
else
{
throw new InvalidOperationException("Too many Next(int) calls.");
}
nextCallCount++;
return(result);
});
random.NextDouble().Returns(0d);
using (var parameters = new ExpressionEvolverGeneticAlgorithmParameters(
new RandomObjectGenerator().Generate <ReadOnlyCollection <ExpressionEvolverResult> >(),
random))
{
Assert.AreEqual("a => (a + a)", parameters.Mutator(a => 3 + a).ToString());
}
}
public void MutateWithNullArgument()
{
using (var parameters = new ExpressionEvolverGeneticAlgorithmParameters(
a => a))
{
parameters.Mutator(null);
}
}
public void MutateOnDisposedObject()
{
ExpressionEvolverGeneticAlgorithmParameters parameters = null;
using (parameters = new ExpressionEvolverGeneticAlgorithmParameters(
a => a)) { }
parameters.Mutator(null);
}
public void MutateWithNoMutation()
{
var random = Substitute.For <SecureRandom>();
random.NextDouble().Returns(1d);
using (var parameters = new ExpressionEvolverGeneticAlgorithmParameters(
new RandomObjectGenerator().Generate <ReadOnlyCollection <ExpressionEvolverResult> >(),
random))
{
Assert.AreEqual("a => (3 + a)", parameters.Mutator(a => 3 + a).ToString());
}
}
