public NebulaCheck.IGen <Test> ItShrinksToTheOrigin() =>
from bias in DomainGen.Bias()
from origin in Gen.Int64()
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.Int64().WithBias(bias).ShrinkTowards(origin);
var minimum = gen.Minimum(seed: seed);
minimum.Should().Be(origin);
});
public NebulaCheck.IGen <Test> ItProducesValuesLessThanOrEqualMaximum() =>
from max in Gen.Int64()
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.Int64().LessThanEqual(max);
var exampleSpace = gen.Advanced.SampleOneExampleSpace(seed: seed, size: size);
exampleSpace.Traverse().Take(100).Should().OnlyContain(value => value <= max);
});
public NebulaCheck.IGen <Test> IfSizeIsBelowChaosSize_AndRangeIsZero_ItDoesNotConsumeRandomness() =>
from seed in DomainGen.Seed()
from size in DomainGen.Size(allowChaos: false)
from iterations in DomainGen.Iterations()
from x in Gen.Int64()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.Int64().Between(x, x);
var sample = gen.Advanced.SampleWithMetrics(iterations: iterations, seed: seed, size: size);
sample.RandomnessConsumption.Should().Be(0);
});
public NebulaCheck.IGen <Test> ItShrinksToTheLocalMinimum_ForANegativeRange() =>
from bias in DomainGen.Bias()
from origin in Gen.Int64().Between(0, -100)
from localMin in Gen.Int64().Between(origin, -200)
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.Int64().WithBias(bias).ShrinkTowards(origin);
var minimum = gen.Minimum(seed: seed, pred: value => value <= localMin);
minimum.Should().Be(localMin);
});
public NebulaCheck.IGen <Test> ItErrorsWhenMaximumIsLessThanOrigin() =>
from max in Gen.Int64().LessThan(long.MaxValue)
from origin in Gen.Int64().GreaterThan(max)
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.Int64().LessThanEqual(max).ShrinkTowards(origin);
Action action = () => gen.SampleOne(seed: seed, size: size);
action.Should()
.Throw <GalaxyCheck.Exceptions.GenErrorException>()
.WithMessage("Error while running generator Int64: 'origin' must be between 'min' and 'max'");
});
public NebulaCheck.IGen <Test> ItErrorsWhenMinimumIsGreaterThanMaximum() =>
from min in Gen.Int64().GreaterThan(long.MinValue)
from max in Gen.Int64().LessThan(min)
from seed in DomainGen.Seed()
from size in DomainGen.Size()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.Int64().GreaterThanEqual(min).LessThanEqual(max);
Action action = () => gen.SampleOne(seed: seed, size: size);
action.Should()
.Throw <GalaxyCheck.Exceptions.GenErrorException>()
.WithMessage("Error while running generator Int64: 'min' cannot be greater than 'max'");
});
public NebulaCheck.IGen <Test> IfSizeIsBelowChaosSize_AndRangeIsNonZero_ItConsumesRandomnessOncePerIteration() =>
from seed in DomainGen.Seed()
from size in DomainGen.Size(allowChaos: false)
from iterations in DomainGen.Iterations()
from x in Gen.Int64()
from y in Gen.Int64()
where x != y
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.Int64().Between(x, y);
var sample = gen.Advanced.SampleWithMetrics(iterations: iterations, seed: seed, size: size);
sample.RandomnessConsumption.Should().Be(sample.Values.Count);
});
public NebulaCheck.IGen <Test> ItShrinksAnyScenarioWithin128Attempts_ForANegativeRange() =>
from bias in DomainGen.Bias().NoShrink()
from localMin in Gen.Int64().Between(0, long.MinValue / 2).NoShrink()
from seed in DomainGen.Seed()
select Property.ForThese(() =>
{
var gen = GalaxyCheck.Gen.Int64().LessThanEqual(0).WithBias(bias);
var minimum = gen.Advanced.MinimumWithMetrics(
seed: seed,
deepMinimum: false,
pred: value => value <= localMin);
minimum.Shrinks.Should().BeLessOrEqualTo(128);
});