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[Mono.Android] JavaList.Add should allow duplicates. #9751

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Merged
jonpryor merged 3 commits into from
Feb 7, 2025
Merged

[Mono.Android] JavaList.Add should allow duplicates. #9751

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fae7cd1
[Mono.Android] `JavaList.Add` should allow duplicates.
jpobst Feb 4, 2025
916b9c9
Fix `Add (int, Object)`
jpobst Feb 5, 2025
373f7ab
Add should append, not prepend.
jpobst Feb 6, 2025
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4 changes: 1 addition & 3 deletions src/Mono.Android/Android.Runtime/JavaList.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -551,9 +551,7 @@ public virtual bool Add (Java.Lang.Object? item)

public virtual bool Add (int index, Java.Lang.Object? item)
{
if (Contains (item))
return false;
Add ((object?) item);
Insert (index, (object?) item);
return true;
}

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32 changes: 32 additions & 0 deletions tests/Mono.Android-Tests/Java.Interop/JavaListTest.cs
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Expand Up @@ -15,6 +15,38 @@ namespace Java.InteropTests
[SetUp]
public void Setup () => list = new T ();

[Test]
public void Add ()
{
list.Add ("foo");
Assert.AreEqual ("foo", list [0]);

// Ensure duplicates are allowed.
list.Add ("foo");
Assert.AreEqual (2, list.Count);
Assert.AreEqual ("foo", list [1]);
}

[Test]
public void AddWithIndex ()
{
list.Add ("Apple");
list.Add ("Banana");
list.Add ("Cherry");

// Ensure index is respected.
list.Add (3, "Grape");
list.Add (2, "Blueberry");
list.Add (4, "Fig");

Assert.AreEqual ("Apple", list [0]);
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@jonpryor jonpryor Feb 6, 2025

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This new test is failing on CI:

Expected is <System.String>, actual is <Java.Lang.ICharSequenceInvoker>
Values differ at index [0]
Expected: 'A'
But was:  'C'

The SubList() test is also failing:

Expected is <System.String>, actual is <Java.Lang.ICharSequenceInvoker>
Values differ at index [0]
Expected: 'f'
But was:  'b'

Very odd. :-(

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@jpobst jpobst Feb 6, 2025

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Fixed.

Assert.AreEqual ("Banana", list [1]);
Assert.AreEqual ("Blueberry", list [2]);
Assert.AreEqual ("Cherry", list [3]);
Assert.AreEqual ("Fig", list [4]);
Assert.AreEqual ("Grape", list [5]);
}

[Test]
public void Count ()
{
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