public NebulaCheck.IGen <Test> IfThereIsOneChoice_ItProducesValuesLikeTheSource() =>
from choiceGen in DomainGen.Gen()
from choiceWeight in Gen.Int32().GreaterThan(1)
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
public NebulaCheck.IGen <Test> ItProducesValuesLikeList() =>
from elementGen in DomainGen.Gen()
from count in Gen.Int32().Between(0, 20)
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
public NebulaCheck.IGen <Test> ItHasACountLimitEnabledByDefault() =>
from seed in DomainGen.Seed()
from size in DomainGen.Size()
from elementGen in DomainGen.Gen()
from excessiveCount in Gen.Int32().Between(1001, 2000)
select Property.ForThese(() =>
{
public NebulaCheck.IGen <Test> ItErrorsWhenMinimumCountIsGreaterThanMaximumCount() =>
from seed in DomainGen.Seed()
from size in DomainGen.Size()
from elementGen in DomainGen.Gen()
from minCount in Gen.Int32().Between(1, 20)
from maxCount in Gen.Int32().GreaterThanEqual(0).LessThan(minCount)
select Property.ForThese(() =>
{
public NebulaCheck.IGen <Test> ItOnlyCallsThePropertyFunctionOnce() =>
from gen in DomainGen.Gen()
from func in Gen.Function <object, bool>(Gen.Boolean())
from seed in Gen.Int32()
let property0 = gen.ForAll(func)
let result0 = property0.Check(seed: seed)
where result0.Falsified
select Property.ForThese(() =>
{
public static NebulaCheck.IGen <Test> ItReportsTheNumberOfTimesTheGenCouldShrink() =>
from gen in DomainGen.Gen()
from numberOfShrinks in Gen.Int32().Between(0, 100)
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var minimum = gen
.Unfold(x => UnfoldToNumberOfShrinks(x, numberOfShrinks))
.Advanced.MinimumWithMetrics(seed: seed);
minimum.Shrinks.Should().Be(numberOfShrinks);
});
public NebulaCheck.IGen <Test> IfTheShrinkLimitIsZero_ThePropertyCanStillBeFalsified() =>
from gen in DomainGen.Gen()
from shrinkLimit in Gen.Int32().LessThanEqual(0)
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var property = gen.ForAll(_ => false);
var result = property.Check(seed: seed, shrinkLimit: shrinkLimit);
result.Falsified.Should().BeTrue();
});
public NebulaCheck.IGen <Test> WhenItIsNotEnumerated_ItWillNotShrink() =>
from elementGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.InfiniteOf();
var sample = gen.Advanced.SampleOneExampleSpace(seed: seed, size: size);
sample.Traverse().Should().ContainSingle();
});
public NebulaCheck.IGen <Test> AGeneratedEnumerableWithoutALimitNeverThrows() =>
from elementGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.InfiniteOf(iterationLimit: null).Select(EnsureSourceCanShrink);
var sample = gen.Advanced.SampleOneExampleSpace(seed: seed, size: size);
AssertUnlimited(sample);
});
public NebulaCheck.IGen <Test> ItExhaustsWithAnImpossiblePredicate() =>
from elementGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.Where(_ => false).InfiniteOf();
Action test = () => gen.SampleOne(seed: seed, size: size).Take(1).ToList();
test.Should().Throw <GalaxyCheck.Exceptions.GenExhaustionException>();
});
public NebulaCheck.IGen <Test> AGeneratedEnumerableHasTheDefaultIterationLimitIfNotConfiguredOtherwise() =>
from elementGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.InfiniteOf().Select(EnsureSourceCanShrink);
var sample = gen.Advanced.SampleOneExampleSpace(seed: seed, size: size);
AssertLimit(sample, ExpectedDefaultIterationLimit);
});
public NebulaCheck.IGen <Test> ItProducesValuesDeterministically() =>
from elementGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.InfiniteOf();
var sample = gen.SampleOne(seed: seed, size: size);
sample.Take(10).Should().BeEquivalentTo(sample.Take(10));
});
public NebulaCheck.IGen <Test> IfThePropertyIsInfallible_ItReturnsTheGivenIterations() =>
from gen in DomainGen.Gen()
from iterations in DomainGen.Iterations()
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var property = gen.ForAll((_) => true);
var result = property.Check(iterations: iterations, seed: seed);
result.Iterations.Should().Be(iterations);
});
public NebulaCheck.IGen <Test> ItIsPure() =>
from returnGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = returnGen.FunctionOf();
var func = gen.SampleOne(seed: seed, size: size);
func().Should().Be(func());
});
public NebulaCheck.IGen <Test> IfSizeIsBelowChaosSize_AndCountIsOfARange_ItConsumesRandomnessForTheCountAndForEachElement() =>
from seed in DomainGen.Seed()
from size in DomainGen.Size(allowChaos: false)
from elementGen in DomainGen.Gen()
select Property.ForThese(() =>
{
var gen = elementGen.ListOf().WithCountBetween(0, 20);
var listSample = gen.Advanced.SampleOneWithMetrics(seed: seed, size: size);
var elementSample = elementGen.Advanced.SampleWithMetrics(iterations: listSample.Value.Count, seed: seed, size: size);
listSample.RandomnessConsumption.Should().Be(elementSample.RandomnessConsumption + 1);
});
public NebulaCheck.IGen <Test> ItConsumesRandomnessOncePerIteration() =>
from elementGen in DomainGen.Gen()
from iterations in DomainGen.Iterations()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.InfiniteOf();
var sample = gen.Advanced.SampleWithMetrics(iterations: iterations, seed: seed, size: size);
sample.RandomnessConsumption.Should().Be(iterations);
});
public NebulaCheck.IGen <Test> ItIsPure() =>
from input in DomainGen.Any().Two()
from returnGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = returnGen.FunctionOf <object, object, object>();
var func = gen.SampleOne(seed: seed, size: size);
func(input.Item1, input.Item2).Should().Be(func(input.Item1, input.Item2));
});
public NebulaCheck.IGen <Test> ItProducesValuesWithOfTheSpecificCount() =>
from elementGen in DomainGen.Gen()
from count in Gen.Int32().Between(0, 20)
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.ListOf().WithCount(count);
var exampleSpace = gen.Advanced.SampleOneExampleSpace(seed: seed, size: size);
exampleSpace.Traverse().Take(100).Should().OnlyContain(value => value.Count == count);
});
public NebulaCheck.IGen <Test> AGeneratedEnumerableHasTheGivenLimit() =>
from elementGen in DomainGen.Gen()
from limit in Gen.Int32().Between(1, 1000)
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.InfiniteOf(iterationLimit: limit).Select(EnsureSourceCanShrink);
var sample = gen.Advanced.SampleOneExampleSpace(seed: seed, size: size);
AssertLimit(sample, limit);
});
public NebulaCheck.IGen <Test> ItShrinksTheCountToTheLocalMinimumCount() =>
from bias in DomainGen.Bias()
from elementGen in DomainGen.Gen()
from localMinCount in Gen.Int32().Between(0, 5)
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.List(elementGen);
var minimum = gen.Minimum(seed: seed, pred: list => list.Count >= localMinCount);
minimum.Should().HaveCount(localMinCount);
});
public NebulaCheck.IGen <Test> IfTheReplayIsInAnInvalidFormat_ItThrows() =>
from gen in DomainGen.Gen()
from func in Gen.Function <object, bool>(Gen.Boolean())
from replay in Gen.Constant("0")
select Property.ForThese(() =>
{
var property = gen.ForAll(func);
Action test = () => property.Check(replay: replay);
test.Should()
.Throw <GalaxyCheck.Exceptions.GenErrorException>()
.WithMessage("Error decoding replay string:*");
});
public NebulaCheck.IGen <Test> ItErrorsWhenMaximumCountIsNegative() =>
from elementGen in DomainGen.Gen()
from maxCount in Gen.Int32().LessThan(0)
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.List(elementGen).WithCountLessThanEqual(maxCount);
Action action = () => gen.SampleOne(seed: seed, size: size);
action.Should()
.Throw <GalaxyCheck.Exceptions.GenErrorException>()
.WithMessage("Error while running generator ListGen: 'maxCount' cannot be negative");
});
public NebulaCheck.IGen <Test> WhenItIsEnumeratedOnce_AndTheElementGeneratorDoesNotShrink_ItWillShrinkOnce() =>
from elementGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = elementGen.NoShrink().InfiniteOf().Select(enumerable =>
{
enumerable.Take(1).ToList();
return(enumerable);
});
var sample = gen.Advanced.SampleOneExampleSpace(seed: seed, size: size);
sample.Traverse().Should().HaveCount(2);
});
public NebulaCheck.IGen <Test> ItShrinksTheCountToTheMinimumCountWhilstShrinkingTheElementsToTheirMinimums() =>
from bias in DomainGen.Bias()
from elementGen in DomainGen.Gen()
from minCount in Gen.Int32().Between(0, 20)
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var elementMinimum = elementGen.Minimum(seed: seed);
var gen = GalaxyCheck.Gen.List(elementGen).WithCountGreaterThanEqual(minCount);
var minimum = gen.Minimum(seed: seed);
minimum.Should()
.HaveCount(minCount).And
.AllBeEquivalentTo(elementMinimum);
});
public NebulaCheck.IGen <Test> IfThePropertyIsInfallible_ItCallsTheTestFunctionForEachIteration() =>
from gen in DomainGen.Gen()
from iterations in DomainGen.Iterations()
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var numberOfCalls = 0;
var property = gen.ForAll((_) =>
{
numberOfCalls++;
return(true);
});
property.Check(iterations: iterations, seed: seed);
numberOfCalls.Should().Be(iterations);
});
public NebulaCheck.IGen <Test> WhenItIsEnumeratedOnce_ItWillShrinkToTheSmallestElementRepeated() =>
from elementGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var elementMin = elementGen.Minimum(seed: SeedUtility.Fork(seed), size: size);
var infiniteGen = elementGen.InfiniteOf().Select(enumerable =>
{
enumerable.Take(1).ToList();
return(enumerable);
});
var minimum = infiniteGen.Minimum(seed: seed, size: size);
minimum.Take(10).Should().BeEquivalentTo(Enumerable.Range(0, 10).Select(_ => elementMin));
});
public NebulaCheck.IGen <Test> TheDefaultMinimumCountIsZero() =>
from elementGen in DomainGen.Gen()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{