using NUnit.Framework;

namespace UnitTests;

public class FluentAssertionsEquivalencyFailureTest
{
    [Test]
    public void Success()
    {
        var expected = new TestClass();
        var actual = new TestClass() { NullableField = DateTime.UtcNow };

        FluentActions.Invoking(() => actual.Should().BeEquivalentTo(expected))
            .Should()
            .Throw<AssertionException>()
            .WithMessage("Expected property actual.NullableField to be <null>, but found <*>.*");
    }

    [Test]
    public void NullReferenceFailure()
    {
        var expected = new TestClass();
        var actual = new TestClass() { NullableField = DateTime.UtcNow };

        FluentActions.Invoking(() => actual.Should().BeEquivalentTo(expected, o => o.Using(EqualityComparer<DateTime>.Default)))
            .Should()
            .Throw<AssertionException>()
            .WithMessage("Expected property actual.NullableField to be <null>, but found <*>.*");
        
        /*
Expected a <NUnit.Framework.AssertionException> to be thrown, but found <System.NullReferenceException>: "
"System.NullReferenceException with message "Object reference not set to an instance of an object."
     at FluentAssertions.Equivalency.Steps.EqualityComparerEquivalencyStep`1.<>c__DisplayClass2_0.<Handle>b__0() in /_/Src/FluentAssertions/Equivalency/Steps/EqualityComparerEquivalencyStep.cs:line 28
     at FluentAssertions.Execution.GivenSelector`1..ctor(Func`1 selector, AssertionScope predecessor, Boolean continueAsserting) in /_/Src/FluentAssertions/Execution/GivenSelector.cs:line 23
     at FluentAssertions.Execution.AssertionScope.Given[T](Func`1 selector) in /_/Src/FluentAssertions/Execution/AssertionScope.cs:line 214
     at FluentAssertions.Execution.ContinuedAssertionScope.Given[T](Func`1 selector) in /_/Src/FluentAssertions/Execution/ContinuedAssertionScope.cs:line 28
     at FluentAssertions.Equivalency.Steps.EqualityComparerEquivalencyStep`1.Handle(Comparands comparands, IEquivalencyValidationContext context, IEquivalencyValidator nestedValidator) in /_/Src/FluentAssertions/Equivalency/Steps/EqualityComparerEquivalencyStep.cs:line 23
     at FluentAssertions.Equivalency.Steps.RunAllUserStepsEquivalencyStep.Handle(Comparands comparands, IEquivalencyValidationContext context, IEquivalencyValidator nestedValidator) in /_/Src/FluentAssertions/Equivalency/Steps/RunAllUserStepsEquivalencyStep.cs:line 11
     at FluentAssertions.Equivalency.EquivalencyValidator.RunStepsUntilEquivalencyIsProven(Comparands comparands, IEquivalencyValidationContext context) in /_/Src/FluentAssertions/Equivalency/EquivalencyValidator.cs:line 69
     at FluentAssertions.Equivalency.EquivalencyValidator.RecursivelyAssertEquality(Comparands comparands, IEquivalencyValidationContext context) in /_/Src/FluentAssertions/Equivalency/EquivalencyValidator.cs:line 39
     at FluentAssertions.Equivalency.Steps.StructuralEqualityEquivalencyStep.AssertMemberEquality(Comparands comparands, IEquivalencyValidationContext context, IEquivalencyValidator parent, IMember selectedMember, IEquivalencyAssertionOptions options) in /_/Src/FluentAssertions/Equivalency/Steps/StructuralEqualityEquivalencyStep.cs:line 72
     at FluentAssertions.Equivalency.Steps.StructuralEqualityEquivalencyStep.Handle(Comparands comparands, IEquivalencyValidationContext context, IEquivalencyValidator nestedValidator) in /_/Src/FluentAssertions/Equivalency/Steps/StructuralEqualityEquivalencyStep.cs:line 45
     at FluentAssertions.Equivalency.EquivalencyValidator.RunStepsUntilEquivalencyIsProven(Comparands comparands, IEquivalencyValidationContext context) in /_/Src/FluentAssertions/Equivalency/EquivalencyValidator.cs:line 69
     at FluentAssertions.Equivalency.EquivalencyValidator.RecursivelyAssertEquality(Comparands comparands, IEquivalencyValidationContext context) in /_/Src/FluentAssertions/Equivalency/EquivalencyValidator.cs:line 39
     at FluentAssertions.Equivalency.EquivalencyValidator.AssertEquality(Comparands comparands, EquivalencyValidationContext context) in /_/Src/FluentAssertions/Equivalency/EquivalencyValidator.cs:line 21
     at FluentAssertions.Primitives.ObjectAssertions`2.BeEquivalentTo[TExpectation](TExpectation expectation, Func`2 config, String because, Object[] becauseArgs) in /_/Src/FluentAssertions/Primitives/ObjectAssertions.cs:line 145
     at UnitTests.FluentAssertionsEquivalencyFailureTest.<>c__DisplayClass1_0.<NullReferenceFailure>b__0() in C:\Telgorithm\src\phone\tmp\My.UnitTests\FluentAssertionsFailureTest.cs:line 25
     at FluentAssertions.Specialized.FunctionAssertions`1.InvokeSubject() in /_/Src/FluentAssertions/Specialized/FunctionAssertions.cs:line 26
     at FluentAssertions.Specialized.DelegateAssertions`2.InvokeSubjectWithInterception() in /_/Src/FluentAssertions/Specialized/DelegateAssertions.cs:line 221
.
   at FluentAssertions.Execution.LateBoundTestFramework.Throw(String message) in /_/Src/FluentAssertions/Execution/LateBoundTestFramework.cs:line 18
   at FluentAssertions.Execution.TestFrameworkProvider.Throw(String message) in /_/Src/FluentAssertions/Execution/TestFrameworkProvider.cs:line 34
   at FluentAssertions.Execution.DefaultAssertionStrategy.HandleFailure(String message) in /_/Src/FluentAssertions/Execution/DefaultAssertionStrategy.cs:line 25
   at FluentAssertions.Execution.AssertionScope.FailWith(Func`1 failReasonFunc) in /_/Src/FluentAssertions/Execution/AssertionScope.cs:line 274
   at FluentAssertions.Execution.AssertionScope.FailWith(Func`1 failReasonFunc) in /_/Src/FluentAssertions/Execution/AssertionScope.cs:line 246
   at FluentAssertions.Execution.AssertionScope.FailWith(String message, Object[] args) in /_/Src/FluentAssertions/Execution/AssertionScope.cs:line 296
   at FluentAssertions.Specialized.DelegateAssertionsBase`2.ThrowInternal[TException](Exception exception, String because, Object[] becauseArgs) in /_/Src/FluentAssertions/Specialized/DelegateAssertionsBase.cs:line 35
   at FluentAssertions.Specialized.DelegateAssertions`2.Throw[TException](String because, Object[] becauseArgs) in /_/Src/FluentAssertions/Specialized/DelegateAssertions.cs:line 48
   at UnitTests.FluentAssertionsEquivalencyFailureTest.NullReferenceFailure() in C:\Telgorithm\src\phone\tmp\My.UnitTests\FluentAssertionsFailureTest.cs:line 25
        */
    }
}

public class TestClass
{
    public DateTime? NullableField { get; set; }
}