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Make mutable generic collection interfaces implement read-only collection interfaces #95830

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Apr 24, 2024
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TylerBrinkley committed Dec 9, 2023
commit df31e3b9ba2ab9728cd209bf067ecf6a2131a793
Original file line number Diff line number Diff line change
@@ -35,7 +35,7 @@ public static void Equal(ICollection expected, ICollection actual)
Assert.False(a.MoveNext(), "actual has more elements");
}

public static void Equal<T>(ICollection<T> expected, ICollection<T> actual)
public static void Equal<T>(IReadOnlyCollection<T> expected, IReadOnlyCollection<T> actual)
{
Assert.Equal(expected == null, actual == null);
if (expected == null)
@@ -80,7 +80,7 @@ public static void EqualUnordered(ICollection expected, ICollection actual)
Assert.Equal(e[null].Count(), a[null].Count());
}

public static void EqualUnordered<T>(ICollection<T> expected, ICollection<T> actual)
public static void EqualUnordered<T>(IReadOnlyCollection<T> expected, IReadOnlyCollection<T> actual)
{
Assert.Equal(expected == null, actual == null);
if (expected == null)
Original file line number Diff line number Diff line change
@@ -146,8 +146,10 @@ public virtual void ICollection_Generic_Add_DefaultValue(int count)
if (DefaultValueAllowed && !IsReadOnly && !AddRemoveClear_ThrowsNotSupported)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
collection.Add(default(T));
Assert.Equal(count + 1, collection.Count);
Assert.Equal(count + 1, readOnlyCollection.Count);
}
}

@@ -160,10 +162,12 @@ public void ICollection_Generic_Add_InvalidValueToMiddleOfCollection(int count)
Assert.All(InvalidValues, invalidValue =>
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
collection.Add(invalidValue);
for (int i = 0; i < count; i++)
collection.Add(CreateT(i));
Assert.Equal(count * 2, collection.Count);
Assert.Equal(count * 2, readOnlyCollection.Count);
});
}
}
@@ -177,10 +181,12 @@ public void ICollection_Generic_Add_InvalidValueToBeginningOfCollection(int coun
Assert.All(InvalidValues, invalidValue =>
{
ICollection<T> collection = GenericICollectionFactory(0);
IReadOnlyCollection<T> readOnlyCollection = collection;
collection.Add(invalidValue);
for (int i = 0; i < count; i++)
collection.Add(CreateT(i));
Assert.Equal(count, collection.Count);
Assert.Equal(count, readOnlyCollection.Count);
});
}
}
@@ -194,8 +200,10 @@ public void ICollection_Generic_Add_InvalidValueToEndOfCollection(int count)
Assert.All(InvalidValues, invalidValue =>
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
collection.Add(invalidValue);
Assert.Equal(count, collection.Count);
Assert.Equal(count, readOnlyCollection.Count);
});
}
}
@@ -207,10 +215,12 @@ public void ICollection_Generic_Add_DuplicateValue(int count)
if (!IsReadOnly && !AddRemoveClear_ThrowsNotSupported && DuplicateValuesAllowed)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
T duplicateValue = CreateT(700);
collection.Add(duplicateValue);
collection.Add(duplicateValue);
Assert.Equal(count + 2, collection.Count);
Assert.Equal(count + 2, readOnlyCollection.Count);
}
}

@@ -221,9 +231,11 @@ public void ICollection_Generic_Add_AfterCallingClear(int count)
if (!IsReadOnly && !AddRemoveClear_ThrowsNotSupported)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
collection.Clear();
AddToCollection(collection, 5);
Assert.Equal(5, collection.Count);
Assert.Equal(5, readOnlyCollection.Count);
}
}

@@ -235,6 +247,7 @@ public void ICollection_Generic_Add_AfterRemovingAnyValue(int count)
{
int seed = 840;
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
List<T> items = collection.ToList();
T toAdd = CreateT(seed++);
while (collection.Contains(toAdd))
@@ -249,6 +262,7 @@ public void ICollection_Generic_Add_AfterRemovingAnyValue(int count)
collection.Add(toAdd);
items.Add(toAdd);
CollectionAsserts.EqualUnordered(items, collection);
CollectionAsserts.EqualUnordered(items, readOnlyCollection);
}
}

@@ -259,11 +273,13 @@ public void ICollection_Generic_Add_AfterRemovingAllItems(int count)
if (!IsReadOnly && !AddRemoveClear_ThrowsNotSupported)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
List<T> itemsToRemove = collection.ToList();
for (int i = 0; i < count; i++)
collection.Remove(collection.ElementAt(0));
collection.Add(CreateT(254));
Assert.Equal(1, collection.Count);
Assert.Equal(1, readOnlyCollection.Count);
}
}

@@ -274,8 +290,10 @@ public void ICollection_Generic_Add_ToReadOnlyCollection(int count)
if (IsReadOnly || AddRemoveClear_ThrowsNotSupported)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
Assert.Throws<NotSupportedException>(() => collection.Add(CreateT(0)));
Assert.Equal(count, collection.Count);
Assert.Equal(count, readOnlyCollection.Count);
}
}

@@ -305,15 +323,18 @@ public void ICollection_Generic_Add_AfterRemoving(int count)
public void ICollection_Generic_Clear(int count)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
if (IsReadOnly || AddRemoveClear_ThrowsNotSupported)
{
Assert.Throws<NotSupportedException>(() => collection.Clear());
Assert.Equal(count, collection.Count);
Assert.Equal(count, readOnlyCollection.Count);
}
else
{
collection.Clear();
Assert.Equal(0, collection.Count);
Assert.Equal(0, readOnlyCollection.Count);
}
}

@@ -322,19 +343,22 @@ public void ICollection_Generic_Clear(int count)
public void ICollection_Generic_Clear_Repeatedly(int count)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
if (IsReadOnly || AddRemoveClear_ThrowsNotSupported)
{
Assert.Throws<NotSupportedException>(() => collection.Clear());
Assert.Throws<NotSupportedException>(() => collection.Clear());
Assert.Throws<NotSupportedException>(() => collection.Clear());
Assert.Equal(count, collection.Count);
Assert.Equal(count, readOnlyCollection.Count);
}
else
{
collection.Clear();
collection.Clear();
collection.Clear();
Assert.Equal(0, collection.Count);
Assert.Equal(0, readOnlyCollection.Count);
}
}

@@ -433,10 +457,12 @@ public void ICollection_Generic_Contains_ValidValueThatExistsTwiceInTheCollectio
if (DuplicateValuesAllowed && !IsReadOnly && !AddRemoveClear_ThrowsNotSupported)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
T item = CreateT(12);
collection.Add(item);
collection.Add(item);
Assert.Equal(count + 2, collection.Count);
Assert.Equal(count + 2, readOnlyCollection.Count);
}
}

@@ -562,6 +588,7 @@ public void ICollection_Generic_Remove_DefaultValueNotContainedInCollection(int
{
int seed = count * 21;
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
T value = default(T);
while (collection.Contains(value))
{
@@ -570,6 +597,7 @@ public void ICollection_Generic_Remove_DefaultValueNotContainedInCollection(int
}
Assert.False(collection.Remove(value));
Assert.Equal(count, collection.Count);
Assert.Equal(count, readOnlyCollection.Count);
}
}

@@ -581,11 +609,13 @@ public void ICollection_Generic_Remove_NonDefaultValueNotContainedInCollection(i
{
int seed = count * 251;
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
T value = CreateT(seed++);
while (collection.Contains(value) || Enumerable.Contains(InvalidValues, value))
value = CreateT(seed++);
Assert.False(collection.Remove(value));
Assert.Equal(count, collection.Count);
Assert.Equal(count, readOnlyCollection.Count);
}
}

@@ -597,6 +627,7 @@ public virtual void ICollection_Generic_Remove_DefaultValueContainedInCollection
{
int seed = count * 21;
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
T value = default(T);
if (!collection.Contains(value))
{
@@ -605,6 +636,7 @@ public virtual void ICollection_Generic_Remove_DefaultValueContainedInCollection
}
Assert.True(collection.Remove(value));
Assert.Equal(count - 1, collection.Count);
Assert.Equal(count - 1, readOnlyCollection.Count);
}
}

@@ -616,6 +648,7 @@ public void ICollection_Generic_Remove_NonDefaultValueContainedInCollection(int
{
int seed = count * 251;
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
T value = CreateT(seed++);
if (!collection.Contains(value))
{
@@ -624,6 +657,7 @@ public void ICollection_Generic_Remove_NonDefaultValueContainedInCollection(int
}
Assert.True(collection.Remove(value));
Assert.Equal(count - 1, collection.Count);
Assert.Equal(count - 1, readOnlyCollection.Count);
}
}

@@ -635,13 +669,15 @@ public void ICollection_Generic_Remove_ValueThatExistsTwiceInCollection(int coun
{
int seed = count * 90;
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
T value = CreateT(seed++);
collection.Add(value);
collection.Add(value);
count += 2;
Assert.True(collection.Remove(value));
Assert.True(collection.Contains(value));
Assert.Equal(count - 1, collection.Count);
Assert.Equal(count - 1, readOnlyCollection.Count);
}
}

@@ -652,11 +688,13 @@ public void ICollection_Generic_Remove_EveryValue(int count)
if (!IsReadOnly && !AddRemoveClear_ThrowsNotSupported)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
Assert.All(collection.ToList(), value =>
{
Assert.True(collection.Remove(value));
});
Assert.Empty(collection);
Assert.Empty(readOnlyCollection);
}
}

@@ -665,11 +703,13 @@ public void ICollection_Generic_Remove_EveryValue(int count)
public void ICollection_Generic_Remove_InvalidValue_ThrowsArgumentException(int count)
{
ICollection<T> collection = GenericICollectionFactory(count);
IReadOnlyCollection<T> readOnlyCollection = collection;
Assert.All(InvalidValues, value =>
{
Assert.Throws<ArgumentException>(() => collection.Remove(value));
});
Assert.Equal(count, collection.Count);
Assert.Equal(count, readOnlyCollection.Count);
}

[Theory]
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