public void NullItems_ShouldThrow_ArgumentNullException()
{
// Arrange
var builder = new global::HashCode.Builder();
// Act & Assert
Assert.Throws <ArgumentNullException>(() => builder.Add <object>((object[])null));
}
public void AreNullsIncluded_Should_DefaultToTrue()
{
// Arrange
// Act
var builder = new global::HashCode.Builder();
// Assert
builder.AreNullsIncluded.Should().BeTrue();
}
public void ComparerNull_Should_ApplyDefaultOrdering()
{
var builder1 = new global::HashCode.Builder();
var builder2 = new global::HashCode.Builder();
// Act
builder1.AddIgnoreOrder(1, 2);
builder2.AddIgnoreOrder(2, 1);
// Assert
builder1.Build().Should().Be(builder2.Build());
}
public void WithComparer_Should_ComputeSameHashCodeAsWithExplicitOrderedItems()
{
var builder1 = new global::HashCode.Builder();
var builder2 = new global::HashCode.Builder();
var comparer = new CallbackComparer <int>((x, y) => (x == y ? 0 : (x < y) ? -1 : +1));
// Act
builder1.AddIgnoreOrder(comparer, 2, 1);
builder2.Add(1, 2);
// Assert
builder1.Build().Should().Be(builder2.Build());
}
public void SameItem_Should_ComputeSameHashCode()
{
// Arrange
var obj = "test";
var builder1 = new global::HashCode.Builder();
var builder2 = new global::HashCode.Builder();
// Act
builder1.Add(obj);
builder2.Add(obj);
// Assert
builder1.Build().Should().Be(builder2.Build());
}
public void WithEqualityComparerReturningTheArgumentIntegerValuesModulusByTwoAndAndWithComparer_Should_ComputeTheSameHashCode()
{
var builder1 = new global::HashCode.Builder();
var builder2 = new global::HashCode.Builder();
var equalityComparer = new CallbackEqualityComparer <int>((x, y) => true, (obj) => obj % 2);
var comparer = new CallbackComparer <int>((x, y) => (x == y ? 0 : (x < y) ? -1 : +1));
// Act
builder1.AddIgnoreOrder(equalityComparer, comparer, 4, 3);
builder2.Add(equalityComparer, 1, 2);
// Assert
builder1.Build().Should().Be(builder2.Build());
}
public void WithEqualityComparerAlwaysReturningTheSameHashCode_Should_ComputeTheSameHashCodeForDifferentItems()
{
// Arrange
var builder1 = new global::HashCode.Builder();
var builder2 = new global::HashCode.Builder();
var equalityComparer = new CallbackEqualityComparer <string>((x, y) => true, (obj) => 1337);
// Act
builder1.Add(equalityComparer, "test", "1");
builder2.Add(equalityComparer, "item", "a");
// Assert
builder1.Build().Should().Be(builder2.Build());
}
public void SameItemsInDifferentOrder_Should_ComputeDifferentHashCodes()
{
// Arrange
var objs = new[] { "test", "item" };
var builder1 = new global::HashCode.Builder();
var builder2 = new global::HashCode.Builder();
// Act
builder1.Add(objs);
builder2.Add(objs.Reverse());
// Assert
builder1.Build().Should().NotBe(builder2.Build());
}
public void NullWhileExcludingNulls_Should_ComputeAlwaysTheSameHashCode()
{
var builder1 = new global::HashCode.Builder()
{
AreNullsIncluded = false
};
var builder2 = new global::HashCode.Builder()
{
AreNullsIncluded = false
};
// Act
builder1.Add((object)null);
builder2.Add((object)null);
// Assert
builder1.Build().Should().Be(builder2.Build());
}
public void NullWhileIncludingNulls_Should_BeDifferentFromNullWhileExcludingNulls()
{
// Arrange
var builder1 = new global::HashCode.Builder()
{
AreNullsIncluded = true
};
var builder2 = new global::HashCode.Builder()
{
AreNullsIncluded = false
};
// Act
builder1.Add((object)null);
builder2.Add((object)null);
// Assert
builder1.Build().Should().NotBe(builder2.Build());
}
public void WhileExcludingNullsAddNullAndNotNullItem_Should_ComputeSameHashCodeWithReversedItemOrder()
{
// Arrange
var obj = "test";
var builder1 = new global::HashCode.Builder()
{
AreNullsIncluded = false
};
var builder2 = new global::HashCode.Builder()
{
AreNullsIncluded = false
};
// Act
builder1.Add((object)null, obj);
builder2.Add(obj, (object)null);
// Assert
builder1.Build().Should().Be(builder2.Build());
}
public void ItemAndNullWhileIncludingNulls_Should_ComputeDifferentHashCodeFromItemAndNullWhlieExcludingNulls()
{
// Arrange
var obj = "test";
var builder1 = new global::HashCode.Builder()
{
AreNullsIncluded = true
};
var builder2 = new global::HashCode.Builder()
{
AreNullsIncluded = false
};
// Act
builder1.Add(obj, (object)null);
builder2.Add(obj, (object)null);
// Assert
builder1.Build().Should().NotBe(builder2.Build());
}
public void BuilderPattern_Should_Succeed()
{
// Arrange
var builder1 = new global::HashCode.Builder();
var builder2 = new global::HashCode.Builder();
// Act
var hashCode1 = builder1
.Add(1)
.Add(2)
.Add(3, 4)
.AddIgnoreOrder(6, 5)
.Build();
builder2.Add(1);
builder2.Add(2);
builder2.Add(3, 4);
builder2.Add(5, 6);
// Assert
hashCode1.Should().Be(builder2.Build());
}
