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Add ReadOnlySet<T> #103306

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merged 3 commits into from
Jun 12, 2024
Merged

Add ReadOnlySet<T> #103306

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03d117a
Add ReadOnlySet<T>
stephentoub Apr 24, 2024
c6b67a2
Merge branch 'main' into readonlyset
stephentoub Jun 12, 2024
3bd9b14
Add test
stephentoub Jun 12, 2024
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Add test
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@stephentoub
stephentoub committed Jun 12, 2024
commit 3bd9b14f4f94b249e502a0ca1a2b3623b311797c
15 changes: 15 additions & 0 deletions src/libraries/System.Collections/tests/Generic/ReadOnlySet/ReadOnlySetTests.cs
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Expand Up @@ -68,6 +68,21 @@ public void MembersDelegateToWrappedSet()
Assert.NotNull(set.GetEnumerator());
}

[Fact]
public void ChangesToUnderlyingSetReflected()
{
var set = new HashSet<int> { 1, 2, 3 };
var readOnlySet = new ReadOnlySet<int>(set);

set.Add(4);
Assert.Equal(4, readOnlySet.Count);
Assert.True(readOnlySet.Contains(4));

set.Remove(2);
Assert.Equal(3, readOnlySet.Count);
Assert.False(readOnlySet.Contains(2));
}

[Fact]
public void IsReadOnly_True()
{
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