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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// NOTE: This code is derived from an implementation originally in dotnet/runtime:
// https://github.com/dotnet/runtime/blob/v8.0.3/src/libraries/Common/tests/System/Collections/IList.NonGeneric.Tests.cs
//
// See the commentary in https://github.com/dotnet/roslyn/pull/50156 for notes on incorporating changes made to the
// reference implementation.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Xunit;
namespace Microsoft.CodeAnalysis.UnitTests.Collections
{
/// <summary>
/// Contains tests that ensure the correctness of any class that implements the nongeneric
/// IList interface
/// </summary>
public abstract class IList_NonGeneric_Tests : ICollection_NonGeneric_Tests
{
#region IList Helper methods
/// <summary>
/// Creates an instance of an IList that can be used for testing.
/// </summary>
/// <returns>An instance of an IList that can be used for testing.</returns>
protected abstract IList NonGenericIListFactory();
/// <summary>
/// Creates an instance of an IList that can be used for testing.
/// </summary>
/// <param name="count">The number of unique items that the returned IList contains.</param>
/// <returns>An instance of an IList that can be used for testing.</returns>
protected virtual IList NonGenericIListFactory(int count)
{
IList collection = NonGenericIListFactory();
AddToCollection(collection, count);
return collection;
}
protected virtual void AddToCollection(IList collection, int numberOfItemsToAdd)
{
int seed = 9600;
while (collection.Count < numberOfItemsToAdd)
{
object toAdd = CreateT(seed++);
while (collection.Contains(toAdd) || InvalidValues.Contains(toAdd))
toAdd = CreateT(seed++);
collection.Add(toAdd);
}
}
/// <summary>
/// Creates an object that is dependent on the seed given. The object may be either
/// a value type or a reference type, chosen based on the value of the seed.
/// </summary>
protected virtual object CreateT(int seed)
{
if (seed % 2 == 0)
{
int stringLength = seed % 10 + 5;
Random rand = new Random(seed);
byte[] bytes = new byte[stringLength];
rand.NextBytes(bytes);
return Convert.ToBase64String(bytes);
}
else
{
Random rand = new Random(seed);
return rand.Next();
}
}
protected virtual bool ExpectedFixedSize => false;
protected virtual Type IList_NonGeneric_Item_InvalidIndex_ThrowType => typeof(ArgumentOutOfRangeException);
protected virtual bool IList_NonGeneric_RemoveNonExistent_Throws => false;
/// <summary>
/// When calling Current of the enumerator after the end of the list and list is extended by new items.
/// Tests are included to cover two behavioral scenarios:
/// - Throwing an InvalidOperationException
/// - Returning an undefined value.
///
/// If this property is set to true, the tests ensure that the exception is thrown. The default value is
/// the same as Enumerator_Current_UndefinedOperation_Throws.
/// </summary>
protected virtual bool IList_CurrentAfterAdd_Throws => Enumerator_Current_UndefinedOperation_Throws;
#endregion
#region ICollection Helper Methods
protected override ICollection NonGenericICollectionFactory() => NonGenericIListFactory();
protected override ICollection NonGenericICollectionFactory(int count) => NonGenericIListFactory(count);
/// <summary>
/// Returns a set of ModifyEnumerable delegates that modify the enumerable passed to them.
/// </summary>
protected override IEnumerable<ModifyEnumerable> GetModifyEnumerables(ModifyOperation operations)
{
if ((operations & ModifyOperation.Add) == ModifyOperation.Add)
{
yield return (IEnumerable enumerable) =>
{
IList casted = ((IList)enumerable);
if (!casted.IsFixedSize && !casted.IsReadOnly)
{
casted.Add(CreateT(2344));
return true;
}
return false;
};
}
if ((operations & ModifyOperation.Insert) == ModifyOperation.Insert)
{
yield return (IEnumerable enumerable) =>
{
IList casted = ((IList)enumerable);
if (!casted.IsFixedSize && !casted.IsReadOnly)
{
casted.Insert(0, CreateT(12));
return true;
}
return false;
};
}
if ((operations & ModifyOperation.Remove) == ModifyOperation.Remove)
{
yield return (IEnumerable enumerable) =>
{
IList casted = ((IList)enumerable);
if (casted.Count > 0 && !casted.IsFixedSize && !casted.IsReadOnly)
{
casted.Remove(casted[0]);
return true;
}
return false;
};
yield return (IEnumerable enumerable) =>
{
IList casted = ((IList)enumerable);
if (casted.Count > 0 && !casted.IsFixedSize && !casted.IsReadOnly)
{
casted.RemoveAt(0);
return true;
}
return false;
};
}
if ((operations & ModifyOperation.Overwrite) == ModifyOperation.Overwrite)
{
yield return (IEnumerable enumerable) =>
{
IList casted = ((IList)enumerable);
if (casted.Count > 0 && !casted.IsReadOnly)
{
casted[0] = CreateT(12);
return true;
}
return false;
};
}
if ((operations & ModifyOperation.Clear) == ModifyOperation.Clear)
{
yield return (IEnumerable enumerable) =>
{
IList casted = ((IList)enumerable);
if (casted.Count > 0 && !casted.IsFixedSize && !casted.IsReadOnly)
{
casted.Clear();
return true;
}
return false;
};
}
}
protected override void AddToCollection(ICollection collection, int numberOfItemsToAdd) => AddToCollection((IList)collection, numberOfItemsToAdd);
#endregion
#region IsFixedSize
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IsFixedSize_Validity(int count)
{
IList collection = NonGenericIListFactory(count);
Assert.Equal(ExpectedFixedSize, collection.IsFixedSize);
}
#endregion
#region IsReadOnly
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IsReadOnly_Validity(int count)
{
IList collection = NonGenericIListFactory(count);
Assert.Equal(IsReadOnly, collection.IsReadOnly);
}
#endregion
#region Item Getter
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemGet_NegativeIndex_ThrowsException(int count)
{
IList list = NonGenericIListFactory(count);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list[-1]);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list[int.MinValue]);
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemGet_IndexGreaterThanListCount_ThrowsException(int count)
{
IList list = NonGenericIListFactory(count);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list[count]);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list[count + 1]);
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemGet_ValidGetWithinListBounds(int count)
{
IList list = NonGenericIListFactory(count);
object? result;
Assert.All(Enumerable.Range(0, count), index => result = list[index]);
}
#endregion
#region Item Setter
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_NegativeIndex_ThrowsException(int count)
{
if (!IsReadOnly)
{
IList list = NonGenericIListFactory(count);
object validAdd = CreateT(0);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list[-1] = validAdd);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list[int.MinValue] = validAdd);
Assert.Equal(count, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_IndexGreaterThanListCount_ThrowsException(int count)
{
if (!IsReadOnly)
{
IList list = NonGenericIListFactory(count);
object validAdd = CreateT(0);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list[count] = validAdd);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list[count + 1] = validAdd);
Assert.Equal(count, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_OnReadOnlyList(int count)
{
if (IsReadOnly)
{
IList list = NonGenericIListFactory(count);
Assert.Throws<NotSupportedException>(() => list[count / 2] = CreateT(321432));
Assert.Equal(count, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_FirstItemToNonNull(int count)
{
if (count > 0 && !IsReadOnly)
{
IList list = NonGenericIListFactory(count);
object value = CreateT(123452);
list[0] = value;
Assert.Equal(value, list[0]);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_FirstItemToNull(int count)
{
if (count > 0 && !IsReadOnly && NullAllowed)
{
IList list = NonGenericIListFactory(count);
object? value = null;
list[0] = value;
Assert.Equal(value, list[0]);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_LastItemToNonNull(int count)
{
if (count > 0 && !IsReadOnly)
{
IList list = NonGenericIListFactory(count);
object value = CreateT(123452);
int lastIndex = count > 0 ? count - 1 : 0;
list[lastIndex] = value;
Assert.Equal(value, list[lastIndex]);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_LastItemToNull(int count)
{
if (count > 0 && !IsReadOnly && NullAllowed)
{
IList list = NonGenericIListFactory(count);
object? value = null;
int lastIndex = count > 0 ? count - 1 : 0;
list[lastIndex] = value;
Assert.Equal(value, list[lastIndex]);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_DuplicateValues(int count)
{
if (count >= 2 && !IsReadOnly && DuplicateValuesAllowed)
{
IList list = NonGenericIListFactory(count);
object value = CreateT(123452);
list[0] = value;
list[1] = value;
Assert.Equal(value, list[0]);
Assert.Equal(value, list[1]);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_ItemSet_InvalidValue(int count)
{
if (!IsReadOnly)
{
Assert.All(InvalidValues, value =>
{
IList list = NonGenericIListFactory(count);
Assert.Throws<ArgumentException>(() => list[count / 2] = value);
});
}
}
#endregion
#region Add
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_Null(int count)
{
if (NullAllowed && !IsReadOnly && !ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
collection.Add(null);
Assert.Equal(count + 1, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_InvalidValueToMiddleOfCollection(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
Assert.All(InvalidValues, invalidValue =>
{
IList collection = NonGenericIListFactory(count);
collection.Add(invalidValue);
for (int i = 0; i < count; i++)
collection.Add(CreateT(i));
Assert.Equal(count * 2, collection.Count);
});
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_InvalidValueToBeginningOfCollection(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
Assert.All(InvalidValues, invalidValue =>
{
IList collection = NonGenericIListFactory(0);
collection.Add(invalidValue);
for (int i = 0; i < count; i++)
collection.Add(CreateT(i));
Assert.Equal(count, collection.Count);
});
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_InvalidValueToEndOfCollection(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
Assert.All(InvalidValues, invalidValue =>
{
IList collection = NonGenericIListFactory(count);
collection.Add(invalidValue);
Assert.Equal(count, collection.Count);
});
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_DuplicateValue(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
if (DuplicateValuesAllowed)
{
IList collection = NonGenericIListFactory(count);
object duplicateValue = CreateT(700);
collection.Add(duplicateValue);
collection.Add(duplicateValue);
Assert.Equal(count + 2, collection.Count);
}
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_AfterCallingClear(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
collection.Clear();
AddToCollection(collection, 5);
Assert.Equal(5, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_AfterRemovingAnyValue(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
int seed = 840;
IList collection = NonGenericIListFactory(count);
object[] items = new object[count];
collection.CopyTo(items, 0);
object toAdd = CreateT(seed++);
while (collection.Contains(toAdd))
toAdd = CreateT(seed++);
collection.Add(toAdd);
collection.RemoveAt(0);
toAdd = CreateT(seed++);
while (collection.Contains(toAdd))
toAdd = CreateT(seed++);
collection.Add(toAdd);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_AfterRemovingAllItems(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
object[] arr = new object[count];
collection.CopyTo(arr, 0);
for (int i = 0; i < count; i++)
collection.Remove(arr[i]);
collection.Add(CreateT(254));
Assert.Equal(1, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_ToReadOnlyCollection(int count)
{
if (IsReadOnly || ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
Assert.Throws<NotSupportedException>(() => collection.Add(CreateT(0)));
Assert.Equal(count, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Add_AfterRemoving(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
int seed = 840;
IList collection = NonGenericIListFactory(count);
object toAdd = CreateT(seed++);
while (collection.Contains(toAdd))
toAdd = CreateT(seed++);
collection.Add(toAdd);
collection.Remove(toAdd);
collection.Add(toAdd);
}
}
#endregion
#region Clear
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Clear(int count)
{
IList collection = NonGenericIListFactory(count);
if (IsReadOnly || ExpectedFixedSize)
{
Assert.Throws<NotSupportedException>(() => collection.Clear());
Assert.Equal(count, collection.Count);
}
else
{
collection.Clear();
Assert.Equal(0, collection.Count);
}
}
#endregion
#region Contains
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Contains_ValidValueOnCollectionNotContainingThatValue(int count)
{
IList collection = NonGenericIListFactory(count);
int seed = 4315;
object item = CreateT(seed++);
while (collection.Contains(item))
item = CreateT(seed++);
Assert.False(collection.Contains(item));
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IList_NonGeneric_Contains_ValidValueOnCollectionContainingThatValue(int count)
{
IList collection = NonGenericIListFactory(count);
foreach (object item in collection)
Assert.True(collection.Contains(item));
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Contains_NullOnCollectionNotContainingNull(int count)
{
IList collection = NonGenericIListFactory(count);
if (NullAllowed)
Assert.False(collection.Contains(null));
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Contains_NullOnCollectionContainingNull(int count)
{
IList collection = NonGenericIListFactory(count);
if (NullAllowed && !IsReadOnly && !ExpectedFixedSize)
{
collection.Add(null);
Assert.True(collection.Contains(null));
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Contains_ValidValueThatExistsTwiceInTheCollection(int count)
{
if (DuplicateValuesAllowed && !IsReadOnly && !ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
object item = CreateT(12);
collection.Add(item);
collection.Add(item);
Assert.Equal(count + 2, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Contains_InvalidValue_ThrowsArgumentException(int count)
{
IList collection = NonGenericIListFactory(count);
Assert.All(InvalidValues, invalidValue =>
Assert.Throws<ArgumentException>(() => collection.Contains(invalidValue))
);
}
#endregion
#region IndexOf
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IndexOf_NullNotContainedInList(int count)
{
if (NullAllowed)
{
IList list = NonGenericIListFactory(count);
object? value = null;
if (list.Contains(value))
{
if (IsReadOnly || ExpectedFixedSize)
return;
list.Remove(value);
}
Assert.Equal(-1, list.IndexOf(value));
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IndexOf_NullContainedInList(int count)
{
if (count > 0 && NullAllowed)
{
IList list = NonGenericIListFactory(count);
object? value = null;
if (!list.Contains(value))
{
if (IsReadOnly || ExpectedFixedSize)
return;
list[0] = value;
}
Assert.Equal(0, list.IndexOf(value));
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IndexOf_ValueInCollectionMultipleTimes(int count)
{
if (count > 0 && !IsReadOnly && !ExpectedFixedSize && DuplicateValuesAllowed)
{
// IndexOf should always return the lowest index for which a matching element is found
IList list = NonGenericIListFactory(count);
object value = CreateT(12345);
list[0] = value;
list[count / 2] = value;
Assert.Equal(0, list.IndexOf(value));
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IndexOf_EachValueNoDuplicates(int count)
{
// Assumes no duplicate elements contained in the list returned by NonGenericIListFactory
IList list = NonGenericIListFactory(count);
Assert.All(Enumerable.Range(0, count), index =>
{
Assert.Equal(index, list.IndexOf(list[index]));
});
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IndexOf_InvalidValue(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
Assert.All(InvalidValues, value =>
{
IList list = NonGenericIListFactory(count);
Assert.Throws<ArgumentException>(() => list.IndexOf(value));
});
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_IndexOf_ReturnsFirstMatchingValue(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
object[] arr = new object[count];
list.CopyTo(arr, 0);
foreach (object duplicate in arr) // hard copies list to circumvent enumeration error
list.Add(duplicate);
object[] expected = new object[count * 2];
list.CopyTo(expected, 0);
Assert.All(Enumerable.Range(0, count), (index =>
Assert.Equal(index, list.IndexOf(expected[index]))
));
}
}
#endregion
#region Insert
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_NegativeIndex_ThrowsException(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
object validAdd = CreateT(0);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list.Insert(-1, validAdd));
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list.Insert(int.MinValue, validAdd));
Assert.Equal(count, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_IndexGreaterThanListCount_Appends(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
object validAdd = CreateT(12350);
list.Insert(count, validAdd);
Assert.Equal(count + 1, list.Count);
Assert.Equal(validAdd, list[count]);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_ToReadOnlyList(int count)
{
if (IsReadOnly || ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
Assert.Throws<NotSupportedException>(() => list.Insert(count / 2, CreateT(321432)));
Assert.Equal(count, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_FirstItemToNonNull(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
object value = CreateT(123452);
list.Insert(0, value);
Assert.Equal(value, list[0]);
Assert.Equal(count + 1, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_FirstItemToNull(int count)
{
if (!IsReadOnly && !ExpectedFixedSize && NullAllowed)
{
IList list = NonGenericIListFactory(count);
object? value = null;
list.Insert(0, value);
Assert.Equal(value, list[0]);
Assert.Equal(count + 1, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_LastItemToNonNull(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
object value = CreateT(123452);
int lastIndex = count > 0 ? count - 1 : 0;
list.Insert(lastIndex, value);
Assert.Equal(value, list[lastIndex]);
Assert.Equal(count + 1, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_LastItemToNull(int count)
{
if (!IsReadOnly && !ExpectedFixedSize && NullAllowed)
{
IList list = NonGenericIListFactory(count);
object? value = null;
int lastIndex = count > 0 ? count - 1 : 0;
list.Insert(lastIndex, value);
Assert.Equal(value, list[lastIndex]);
Assert.Equal(count + 1, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_DuplicateValues(int count)
{
if (!IsReadOnly && !ExpectedFixedSize && DuplicateValuesAllowed)
{
IList list = NonGenericIListFactory(count);
object value = CreateT(123452);
list.Insert(0, value);
list.Insert(1, value);
Assert.Equal(value, list[0]);
Assert.Equal(value, list[1]);
Assert.Equal(count + 2, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Insert_InvalidValue(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
Assert.All(InvalidValues, value =>
{
IList list = NonGenericIListFactory(count);
Assert.Throws<ArgumentException>(() => list.Insert(count / 2, value));
});
}
}
#endregion
#region Remove
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IListNonGeneric_Remove_OnReadOnlyCollection_ThrowsNotSupportedException(int count)
{
if (IsReadOnly || ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
Assert.Throws<NotSupportedException>(() => collection.Remove(CreateT(34543)));
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Remove_NullNotContainedInCollection(int count)
{
if (!IsReadOnly && !ExpectedFixedSize && NullAllowed && !Enumerable.Contains(InvalidValues, null))
{
int seed = count * 21;
IList collection = NonGenericIListFactory(count);
object? value = null;
while (collection.Contains(value))
{
collection.Remove(value);
count--;
}
collection.Remove(value);
Assert.Equal(count, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Remove_NonNullNotContainedInCollection(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
int seed = count * 251;
IList list = NonGenericIListFactory(count);
object value = CreateT(seed++);
while (list.Contains(value) || Enumerable.Contains(InvalidValues, value))
value = CreateT(seed++);
list.Remove(value);
if (IList_NonGeneric_RemoveNonExistent_Throws)
{
Assert.Throws<ArgumentException>(() => list.Remove(value));
}
else
{
Assert.Equal(count, list.Count);
}
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Remove_NullContainedInCollection(int count)
{
if (!IsReadOnly && !ExpectedFixedSize && NullAllowed && !Enumerable.Contains(InvalidValues, null))
{
int seed = count * 21;
IList collection = NonGenericIListFactory(count);
object? value = null;
if (!collection.Contains(value))
{
collection.Add(value);
count++;
}
collection.Remove(value);
Assert.Equal(count - 1, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Remove_NonNullContainedInCollection(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
int seed = count * 251;
IList collection = NonGenericIListFactory(count);
object value = CreateT(seed++);
if (!collection.Contains(value))
{
collection.Add(value);
count++;
}
collection.Remove(value);
Assert.Equal(count - 1, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Remove_ValueThatExistsTwiceInCollection(int count)
{
if (!IsReadOnly && !ExpectedFixedSize && DuplicateValuesAllowed)
{
int seed = count * 90;
IList collection = NonGenericIListFactory(count);
object value = CreateT(seed++);
collection.Add(value);
collection.Add(value);
count += 2;
collection.Remove(value);
Assert.True(collection.Contains(value));
Assert.Equal(count - 1, collection.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Remove_EveryValue(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
object[] arr = new object[count];
collection.CopyTo(arr, 0);
Assert.All(arr, value =>
{
collection.Remove(value);
});
Assert.Empty(collection);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_Remove_InvalidValue_ThrowsArgumentException(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
Assert.All(InvalidValues, value =>
{
Assert.Throws<ArgumentException>(() => collection.Remove(value));
});
Assert.Equal(count, collection.Count);
}
}
#endregion
#region RemoveAt
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_RemoveAt_NegativeIndex_ThrowsException(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
object validAdd = CreateT(0);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list.RemoveAt(-1));
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list.RemoveAt(int.MinValue));
Assert.Equal(count, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_RemoveAt_IndexGreaterThanListCount_ThrowsException(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
object validAdd = CreateT(0);
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list.RemoveAt(count));
Assert.Throws(IList_NonGeneric_Item_InvalidIndex_ThrowType, () => list.RemoveAt(count + 1));
Assert.Equal(count, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_RemoveAt_OnReadOnlyList(int count)
{
if (IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
Assert.Throws<NotSupportedException>(() => list.RemoveAt(count / 2));
Assert.Equal(count, list.Count);
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_RemoveAt_AllValidIndices(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
Assert.Equal(count, list.Count);
Assert.All(Enumerable.Range(0, count).Reverse(), index =>
{
list.RemoveAt(index);
Assert.Equal(index, list.Count);
});
}
}
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_RemoveAt_ZeroMultipleTimes(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList list = NonGenericIListFactory(count);
Assert.All(Enumerable.Range(0, count), index =>
{
list.RemoveAt(0);
Assert.Equal(count - index - 1, list.Count);
});
}
}
#endregion
#region Enumerator.Current
// Test Enumerator.Current at end after new elements was added
[Theory]
[MemberData(nameof(ValidCollectionSizes))]
public void IList_NonGeneric_CurrentAtEnd_AfterAdd(int count)
{
if (!IsReadOnly && !ExpectedFixedSize)
{
IList collection = NonGenericIListFactory(count);
IEnumerator enumerator = collection.GetEnumerator();
while (enumerator.MoveNext()) ; // Go to end of enumerator
if (Enumerator_Current_UndefinedOperation_Throws)
{
Assert.Throws<InvalidOperationException>(() => enumerator.Current); // Enumerator.Current should fail
}
else
{
_ = enumerator.Current; // Enumerator.Current should not fail
}
// Test after add
int seed = 523561;
for (int i = 0; i < 3; i++)
{
collection.Add(CreateT(seed++));
if (IList_CurrentAfterAdd_Throws)
{
Assert.Throws<InvalidOperationException>(() => enumerator.Current); // Enumerator.Current should fail
}
else
{
_ = enumerator.Current; // Enumerator.Current should not fail
}
}
}
}
#endregion
}
}
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