What's Changed

Improvements

• Improve BeEmpty() and BeNullOrEmpty() performance for IEnumerable<T>, by materializing only the first item - #2530

Fixes

• Fixed formatting error when checking nullable DateTimeOffset with BeWithin(...).Before(...) - #2312
• BeEquivalentTo will now find and can map subject properties that are implemented through an explicitly-implemented interface - #2152
• Fixed that the because and becauseArgs were not passed down the equivalency tree - #2318
• BeEquivalentTo can again compare a non-generic IDictionary with a generic one - #2358
• Fixed that the FormattingOptions were not respected in inner AssertionScope - #2329
• Capitalize true and false in failure messages and make them formattable to a custom BooleanFormatter - #2390, #2393
• Improved the failure message for NotBeOfType when wrapped in an AssertionScope and the subject is null - #2399
• Improved the failure message for BeWritable/BeReadable when wrapped in an AssertionScope and the subject is read-only/write-only - #2399
• Improved the failure message for ThrowExactly[Async] when wrapped in an AssertionScope and no exception is thrown - #2398
• Improved the failure message for [Not]HaveExplicitProperty when wrapped in an AssertionScope and not implementing the interface - #2403
• Improved the failure message for [Not]HaveExplicitMethod when wrapped in an AssertionScope and not implementing the interface - #2403
• Changed BeEquivalentTo to exclude private protected members from the comparison - #2417
• Fixed using BeEquivalentTo on an empty ArraySegment - #2445, #2511
• BeEquivalentTo with a custom comparer can now handle null values - #2489
• Ensured that nested calls to AssertionScope(context) create a chained context - #2607
• One overload of the AssertionScope constructor would not create an actual scope associated with the thread - #2607
• Fixed ThrowWithinAsync not respecting OperationCanceledException - #2614
• Fixed using BeEquivalentTo with an IEqualityComparer targeting nullable types - #2648

Full Changelog: https://github.com/fluentassertions/fluentassertions/compare/6.12.0...6.12.1