public void Cycle_detection_in_multiple_threads_works()
{
Helper.Parallel(() => {
var comparer = new ComparerBuilder().GetEqualityComparer <OneSealed>();
var one = _fixture.Create <OneSealed>();
var other = _fixture.Create <OneSealed>();
one.Two.Three.One = one;
other.Two.Three.One = other;
using (new AssertionScope()) {
comparer.Equals(one, other).Should().BeFalse();
comparer.GetHashCode(one).Should().NotBe(comparer.GetHashCode(other));
}
});
}
public void No_cycle_when_identical_objects_in_collection()
{
var one = new SelfSealed {
Value = 1
};
one.Second = new SelfSealed {
First = one,
Value = 1
};
var two = new SelfSealed {
Value = 1
};
two.Second = new SelfSealed {
First = two,
Value = 1
};
var x = new[] {
one,
one,
one
};
var other = new SelfSealed {
Second = new SelfSealed {
First = new SelfSealed {
Value = 4
},
Value = 4
},
Value = 3
};
var y = new[] {
two,
two,
other
};
var comparer = new ComparerBuilder().For <SelfSealed>().GetEqualityComparer <SelfSealed[]>();
using (new AssertionScope()) {
comparer.Equals(x, y).Should().BeFalse();
comparer.GetHashCode(x).Should().Be(271135911);
comparer.GetHashCode(y).Should().Be(194708355);
}
}
public void Custom_comparer_should_be_used_for_collection_when_defined()
{
Test(() => {
var x = _fixture.Create <ComparableObject <int[]> >();
var y = _fixture.Create <ComparableObject <int[]> >();
var referenceComparer = new ComparableObjectEqualityComparer <int[]>(new CustomizableEqualityComparer <int[]>(
(a, b) => a is null && b is null || !(a is null || b is null), _ => 0));
var expected = referenceComparer.Equals(x, y);
var equalsIsUsed = false;
var hashIsUsed = false;
var comparer = new ComparerBuilder(c => c
.SetDefaultCollectionsOrderIgnoring(_fixture.Create <bool>())
.SetCustomEqualityComparer(new CustomizableEqualityComparer <int>(
(__, _) => {
equalsIsUsed = true;
return(true);
},
_ => {
hashIsUsed = true;
return(0);
})))
.GetEqualityComparer <ComparableObject <int[]> >();
var actualEquals = comparer.Equals(x, y);
var hashX = comparer.GetHashCode(x);
var hashY = comparer.GetHashCode(y);
using (new AssertionScope()) {
actualEquals.Should().Be(expected);
hashX.Should().NotBe(0);
hashY.Should().NotBe(0);
var fieldIsNull = x.Field is null || y.Field is null;
var propertyIsNull = x.Property is null || y.Property is null;
var fieldsAreNulls = x.Field is null && y.Field is null;
var propertiesAreNulls = x.Property is null && y.Property is null;
equalsIsUsed.Should().Be(!fieldIsNull || fieldsAreNulls && !propertyIsNull, $"null checks are used.\n{x}\n{y}");
hashIsUsed.Should().Be(!fieldsAreNulls || !propertiesAreNulls, $"null checks are used.\n{x}\n{y}");
}
});
}
public void Should_use_delayed_comparison()
{
var x = _fixture.CreateMany <SampleEqualityStruct <EnumSmall?>?>().ToArray();
var y = _fixture.CreateMany <SampleEqualityStruct <EnumSmall?>?>().ToArray();
var referenceComparer = new CollectionEqualityComparer <SampleEqualityStruct <EnumSmall?>?>(
new NullableEqualityComparer <SampleEqualityStruct <EnumSmall?> >());
var comparer = new ComparerBuilder().GetEqualityComparer <object>();
var expectedHashX = referenceComparer.GetHashCode(x);
var expectedHashY = referenceComparer.GetHashCode(y);
var actualHashX = comparer.GetHashCode(x);
var actualHashY = comparer.GetHashCode(y);
var expected = referenceComparer.Equals(x, y);
var actual = comparer.Equals(x, y);
using (new AssertionScope()) {
actualHashX.Should().Be(expectedHashX);
actualHashY.Should().Be(expectedHashY);
actual.Should().Be(expected);
}
}
public void Custom_comparer_should_be_used_for_structs()
{
Test(() => {
var x = _fixture.Create <ComparableStruct <string> >();
var y = _fixture.Create <ComparableStruct <string> >();
var comparer = new ComparerBuilder(c => c
.SetCustomEqualityComparer <SampleStructCustomEqualityComparer>())
.GetEqualityComparer <ComparableStruct <string> >();
using (new AssertionScope()) {
comparer.Equals(x, y).Should().BeTrue();
comparer.GetHashCode(x).Should().Be(0);
}
});
}
public void Custom_comparer_defined_as_a_type_should_be_used()
{
Test(() => {
var x = _fixture.Create <SampleObject <ComparableStruct <string> > >();
var y = _fixture.Create <SampleObject <ComparableStruct <string> > >();
var expectedCustomHash = HashCodeCombiner.Combine(0, 0);
var comparer = new ComparerBuilder(c => c
.SetCustomEqualityComparer <SampleStructCustomEqualityComparer>())
.GetEqualityComparer <SampleObject <ComparableStruct <string> > >();
using (new AssertionScope()) {
comparer.Equals(x, y).Should().BeTrue();
comparer.GetHashCode(x).Should().Be(expectedCustomHash);
}
});
}
