public void TestIEnumeratorT()
{
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>();
IEnumerator <int> enumerator = set.GetEnumerator();
Assert.Equal(0, enumerator.Current);
Assert.False(enumerator.MoveNext());
Assert.Equal(0, enumerator.Current);
// Adding an item to the list invalidates it, but Current is still unchecked
CollectionAssert.EnumeratorInvalidated(set, () => set.Add(1));
Assert.Throws <InvalidOperationException>(() => enumerator.MoveNext());
Assert.Throws <InvalidOperationException>(() => enumerator.Reset());
Assert.Equal(0, enumerator.Current);
enumerator = set.GetEnumerator();
Assert.Equal(0, enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal(1, enumerator.Current);
Assert.False(enumerator.MoveNext());
Assert.Equal(1, enumerator.Current);
enumerator.Reset();
Assert.Equal(0, enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal(1, enumerator.Current);
enumerator.Reset();
Assert.Equal(0, enumerator.Current);
Assert.True(enumerator.MoveNext());
Assert.Equal(1, enumerator.Current);
Assert.False(enumerator.MoveNext());
Assert.Equal(1, enumerator.Current);
}
public void TestTrimExcess()
{
var random = new Random();
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>();
var reference = new SortedSet <int>();
for (int i = 0; i < 2 * 4 * 4; i++)
{
int value = random.Next(set.Count + 1);
set.Add(i);
reference.Add(i);
}
set.Validate(ValidationRules.None);
// In the first call to TrimExcess, items will move
set.TrimExcess();
set.Validate(ValidationRules.RequirePacked);
Assert.Equal(reference, set);
// In the second call, the list is already packed so nothing will move
set.TrimExcess();
set.Validate(ValidationRules.RequirePacked);
Assert.Equal(reference, set);
ImmutableTreeSet <int> .Builder empty = ImmutableTreeSet.CreateBuilder <int>();
empty.Validate(ValidationRules.RequirePacked);
empty.TrimExcess();
empty.Validate(ValidationRules.RequirePacked);
var single = ImmutableTreeSet.CreateRange <int>(Enumerable.Range(0, 1)).ToBuilder();
single.Validate(ValidationRules.RequirePacked);
single.TrimExcess();
single.Validate(ValidationRules.RequirePacked);
// Construct a poorly-packed list with several levels
ImmutableTreeSet <int> .Builder binary = ImmutableTreeSet.CreateBuilder <int>();
for (int i = 99; i >= 0; i--)
{
binary.Add(i);
}
binary.TrimExcess();
binary.Validate(ValidationRules.RequirePacked);
// Construct a poorly-packed list with several levels
var ternary = ImmutableTreeSet.CreateRange <int>(equalityComparer: null, Enumerable.Range(0, 100)).ToBuilder();
for (int i = 99; i >= 0; i--)
{
ternary.Add(i);
}
ternary.TrimExcess();
ternary.Validate(ValidationRules.RequirePacked);
}
public void TestSetEqualsEdgeCase()
{
EqualityComparer <int> equalityComparer = EqualityComparer <int> .Default;
Func <int, int> getHashCode = value => Math.Abs(value) < 5 ? 0 : 1;
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder(new SubsetHashCodeEqualityComparer <int>(equalityComparer, getHashCode));
set.UnionWith(new[] { 1, 3, 7, 9 });
Assert.False(set.SetEquals(new[] { 1, 4, 7, 9 }));
}
public void TestRemoveEdgeCase()
{
EqualityComparer <int> equalityComparer = EqualityComparer <int> .Default;
Func <int, int> getHashCode = value => Math.Abs(value) < 5 ? 0 : 1;
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder(new SubsetHashCodeEqualityComparer <int>(equalityComparer, getHashCode));
set.UnionWith(Enumerable.Range(0, 10));
Assert.True(set.Remove(4));
Assert.False(set.Remove(4));
}
public void TestClear()
{
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>();
set.Clear();
Assert.Empty(set);
set.UnionWith(Enumerable.Range(0, 10));
Assert.NotEmpty(set);
set.Clear();
Assert.Empty(set);
}
public void TestAddStaysPacked()
{
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>();
for (int i = 0; i < 4 * 8 * 8; i++)
{
// This test assumes items are being added are already ordered by hash code
Assert.Equal(i, i.GetHashCode());
set.Add(i);
set.Validate(ValidationRules.RequirePacked);
}
}
public void TestAdd()
{
int value = Generator.GetInt32();
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>();
Assert.Empty(set);
set.Add(value);
Assert.Single(set);
Assert.Equal(value, set.First());
int[] expected = { value };
int[] actual = set.ToArray();
Assert.Equal(expected, actual);
}
public void TestIntersectWithEdgeCase()
{
EqualityComparer <int> equalityComparer = EqualityComparer <int> .Default;
Func <int, int> getHashCode = value => Math.Abs(value) < 5 ? 0 : 1;
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder(new SubsetHashCodeEqualityComparer <int>(equalityComparer, getHashCode));
ImmutableTreeSet <int> .Builder other = ImmutableTreeSet.CreateBuilder(set.KeyComparer);
set.UnionWith(Enumerable.Range(0, 10));
other.UnionWith(new[] { 4, 3, 5 });
set.IntersectWith(other);
Assert.Equal(new[] { 3, 4, 5 }, set);
}
public void TestExplicitComparer()
{
ZeroHashCodeEqualityComparer <object> objComparer = ZeroHashCodeEqualityComparer <object> .Default;
ZeroHashCodeEqualityComparer <int> intComparer = ZeroHashCodeEqualityComparer <int> .Default;
ZeroHashCodeEqualityComparer <IComparable> comparableComparer = ZeroHashCodeEqualityComparer <IComparable> .Default;
Assert.Same(objComparer, ImmutableTreeSet.CreateBuilder <object>(equalityComparer: objComparer).KeyComparer);
Assert.Same(intComparer, ImmutableTreeSet.CreateBuilder <int>(equalityComparer: intComparer).KeyComparer);
Assert.Same(comparableComparer, ImmutableTreeSet.CreateBuilder <IComparable>(equalityComparer: comparableComparer).KeyComparer);
Assert.Same(objComparer, ImmutableTreeSet.CreateRange <object>(equalityComparer: objComparer, Enumerable.Empty <object>()).ToBuilder().KeyComparer);
Assert.Same(intComparer, ImmutableTreeSet.CreateRange <int>(equalityComparer: intComparer, Enumerable.Empty <int>()).ToBuilder().KeyComparer);
Assert.Same(comparableComparer, ImmutableTreeSet.CreateRange <IComparable>(equalityComparer: comparableComparer, Enumerable.Empty <IComparable>()).ToBuilder().KeyComparer);
}
public void TestTryGetValue()
{
ImmutableTreeSet <string?> .Builder set = ImmutableTreeSet.CreateBuilder(StringComparer.OrdinalIgnoreCase);
Assert.True(set.Add("a"));
Assert.False(set.Add("A"));
Assert.True(set.TryGetValue("a", out string?value));
Assert.Equal("a", value);
Assert.True(set.TryGetValue("A", out value));
Assert.Equal("a", value);
Assert.False(set.TryGetValue("b", out value));
Assert.Null(value);
}
public void TestAddMany()
{
int[] expected = { 600, 601, 602, 603, 700, 701, 702, 703, 800, 801, 802, 803 };
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>();
foreach (var item in expected)
{
set.Add(item);
}
Assert.Equal(expected.Length, set.Count);
int[] actual = set.ToArray();
Assert.Equal(expected, actual);
}
public void TestCollectionConstructorUsesCorrectComparer()
{
object instance1 = new object();
object instance2 = new object();
var objectSet = ImmutableTreeSet.Create <object>(ZeroHashCodeEqualityComparer <object> .Default, new[] { instance1, instance2, instance1 }).ToBuilder();
Assert.Same(ZeroHashCodeEqualityComparer <object> .Default, objectSet.KeyComparer);
Assert.Equal(2, objectSet.Count);
Assert.Equal(new[] { instance1, instance2 }, objectSet);
ImmutableTreeSet <string?> .Builder stringSet = ImmutableTreeSet.CreateBuilder <string?>();
Assert.Same(EqualityComparer <string> .Default, stringSet.KeyComparer);
stringSet = ImmutableTreeSet.CreateBuilder(StringComparer.OrdinalIgnoreCase);
Assert.Same(StringComparer.OrdinalIgnoreCase, stringSet.KeyComparer);
}
public void TestContains()
{
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>();
for (int i = 0; i < 4 * 8 * 8; i++)
{
int value = Generator.GetInt32(set.Count + 1);
set.Add(i);
// Use set.Contains(i) since this is a targeted collection API test
#pragma warning disable xUnit2017 // Do not use Contains() to check if a value exists in a collection
Assert.True(set.Contains(i));
#pragma warning restore xUnit2017 // Do not use Contains() to check if a value exists in a collection
}
set.Validate(ValidationRules.None);
}
public void TestDefaultComparer()
{
Assert.Same(EqualityComparer <object> .Default, ImmutableTreeSet.CreateBuilder <object>().KeyComparer);
Assert.Same(EqualityComparer <int> .Default, ImmutableTreeSet.CreateBuilder <int>().KeyComparer);
Assert.Same(EqualityComparer <IComparable> .Default, ImmutableTreeSet.CreateBuilder <IComparable>().KeyComparer);
Assert.Same(EqualityComparer <object> .Default, ImmutableTreeSet.CreateRange <object>(Enumerable.Empty <object>()).ToBuilder().KeyComparer);
Assert.Same(EqualityComparer <int> .Default, ImmutableTreeSet.CreateRange <int>(Enumerable.Empty <int>()).ToBuilder().KeyComparer);
Assert.Same(EqualityComparer <IComparable> .Default, ImmutableTreeSet.CreateRange <IComparable>(Enumerable.Empty <IComparable>()).ToBuilder().KeyComparer);
Assert.Same(EqualityComparer <object> .Default, ImmutableTreeSet.CreateBuilder <object>(equalityComparer: null).KeyComparer);
Assert.Same(EqualityComparer <int> .Default, ImmutableTreeSet.CreateBuilder <int>(equalityComparer: null).KeyComparer);
Assert.Same(EqualityComparer <IComparable> .Default, ImmutableTreeSet.CreateBuilder <IComparable>(equalityComparer: null).KeyComparer);
Assert.Same(EqualityComparer <object> .Default, ImmutableTreeSet.CreateRange <object>(equalityComparer: null, Enumerable.Empty <object>()).ToBuilder().KeyComparer);
Assert.Same(EqualityComparer <int> .Default, ImmutableTreeSet.CreateRange <int>(equalityComparer: null, Enumerable.Empty <int>()).ToBuilder().KeyComparer);
Assert.Same(EqualityComparer <IComparable> .Default, ImmutableTreeSet.CreateRange <IComparable>(equalityComparer: null, Enumerable.Empty <IComparable>()).ToBuilder().KeyComparer);
}
public void TestTryGetValueWithCollidingHashCodes()
{
ImmutableTreeSet <string?> .Builder set = ImmutableTreeSet.CreateBuilder(new ZeroHashCodeEqualityComparer <string?>(StringComparer.OrdinalIgnoreCase));
Assert.True(set.Add("a"));
Assert.False(set.Add("A"));
Assert.True(set.TryGetValue("a", out string?value));
Assert.Equal("a", value);
Assert.True(set.TryGetValue("A", out value));
Assert.Equal("a", value);
Assert.False(set.TryGetValue("b", out value));
Assert.Null(value);
// The test below forces coverage of an edge case. We don't know if the hash code for 'aa' or 'bb' comes
// first, so write the test in a way that either will cover the early-exit branch in TryGetValue.
set = ImmutableTreeSet.CreateBuilder(new SubsetHashCodeEqualityComparer <string?>(StringComparer.Ordinal, StringComparer.OrdinalIgnoreCase));
Assert.True(set.Add("aa"));
Assert.True(set.Add("Aa"));
Assert.True(set.Add("bb"));
Assert.True(set.Add("Bb"));
Assert.True(set.TryGetValue("aa", out value));
Assert.Equal("aa", value);
Assert.True(set.TryGetValue("Aa", out value));
Assert.Equal("Aa", value);
Assert.False(set.TryGetValue("AA", out value));
Assert.Null(value);
Assert.True(set.TryGetValue("bb", out value));
Assert.Equal("bb", value);
Assert.True(set.TryGetValue("Bb", out value));
Assert.Equal("Bb", value);
Assert.False(set.TryGetValue("BB", out value));
Assert.Null(value);
}
protected override ISet <T> CreateSet <T>()
{
return(ImmutableTreeSet.CreateBuilder(ZeroHashCodeEqualityComparer <T> .Default));
}
protected override ISet <T> CreateSet <T>()
{
return(ImmutableTreeSet.CreateBuilder <T>());
}
public void TestImmutableTreeSetBuilderConstructor()
{
ImmutableTreeSet <int> .Builder set = ImmutableTreeSet.CreateBuilder <int>();
Assert.Empty(set);
}
