Merge pull request nunit#4922 from nunit/Issue4909_PropertiesWriter

DelayedConstraint shows full result of underlying constraint.

.github/workflows/NUnit.CI.yml

@@ -27,6 +27,9 @@ jobs:
       uses: actions/setup-dotnet@v4
       with:
         global-json-file: global.json
+        dotnet-version: |
+            6.0.x
+            8.0.x
         
     - name: 🛠️ Install dotnet tools
       run: dotnet tool restore
@@ -68,6 +71,9 @@ jobs:
       uses: actions/setup-dotnet@v4
       with:
         global-json-file: global.json
+        dotnet-version: |
+            6.0.x
+            8.0.x
 
     - name: 🛠️ Install F#
       run: sudo apt-get install fsharp
@@ -100,7 +106,9 @@ jobs:
       uses: actions/setup-dotnet@v4
       with:
         global-json-file: global.json
-        dotnet-version: 6.x
+        dotnet-version: |
+            6.0.x
+            8.0.x
 
     - name: 🛠️ Install dotnet tools
       run: dotnet tool restore

src/NUnitFramework/framework/Assert.Exceptions.Async.cs

@@ -21,13 +21,17 @@ public partial class Assert
         public static Exception? ThrowsAsync(IResolveConstraint expression, AsyncTestDelegate code, string message, params object?[]? args)
         {
             Exception? caughtException = null;
-            try
-            {
-                AsyncToSyncAdapter.Await(TestExecutionContext.CurrentContext, code.Invoke);
-            }
-            catch (Exception e)
+
+            using (new TestExecutionContext.IsolatedContext())
             {
-                caughtException = e;
+                try
+                {
+                    AsyncToSyncAdapter.Await(TestExecutionContext.CurrentContext, code.Invoke);
+                }
+                catch (Exception e)
+                {
+                    caughtException = e;
+                }
             }
 
             Assert.That(caughtException, expression, () => ConvertMessageWithArgs(message, args));

src/NUnitFramework/framework/Constraints/DelayedConstraint.cs

@@ -220,7 +220,7 @@ private DelayedConstraint(IConstraint baseConstraint, Interval delayInterval, In
         /// <summary>
         /// Gets text describing a constraint
         /// </summary>
-        public override string Description => $"{BaseConstraint.Description} after {DelayInterval} delay";
+        public override string Description => $"After {DelayInterval} delay";
 
         /// <summary>
         /// Test whether the constraint is satisfied by a given value
@@ -401,9 +401,11 @@ public DelegatingConstraintResult(IConstraint constraint, ConstraintResult inner
                 _innerResult = innerResult;
             }
 
-            public override void WriteActualValueTo(MessageWriter writer) => _innerResult.WriteActualValueTo(writer);
-
-            public override void WriteAdditionalLinesTo(MessageWriter writer) => _innerResult.WriteAdditionalLinesTo(writer);
+            public override void WriteMessageTo(MessageWriter writer)
+            {
+                writer.WriteMessageLine(Description);
+                _innerResult.WriteMessageTo(writer);
+            }
         }
     }
 }

src/NUnitFramework/framework/Constraints/EqualConstraint.cs

@@ -404,6 +404,10 @@ public EqualConstraint UsingPropertiesComparer()
         /// <returns>True for success, false for failure</returns>
         public override ConstraintResult ApplyTo<TActual>(TActual actual)
         {
+            // Reset the comparer before each use, e.g. for DelayedConstraint
+            if (_comparer.HasFailurePoints)
+                _comparer.FailurePoints.Clear();
+
             AdjustArgumentIfNeeded(ref actual);
             return new EqualConstraintResult(this, actual, _comparer.AreEqual(_expected, actual, ref _tolerance));
         }

src/NUnitFramework/framework/Constraints/EqualConstraintResult.cs

@@ -4,6 +4,7 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
+using NUnit.Framework.Internal;
 
 namespace NUnit.Framework.Constraints
 {
@@ -123,7 +124,7 @@ private void DisplayDifferences(MessageWriter writer, object? expected, object?
             else if (expected is Stream expectedStream && actual is Stream actualStream)
                 DisplayStreamDifferences(writer, expectedStream, actualStream, depth);
             else if (_comparingProperties && IsPropertyFailurePoint(depth))
-                DisplayPropertyDifferences(writer, depth);
+                DisplayPropertyDifferences(writer, expected, actual, depth);
             else if (_tolerance is not null)
                 writer.DisplayDifferences(expected, actual, _tolerance);
             else
@@ -220,8 +221,8 @@ private void DisplayCollectionDifferenceWithFailurePoint(MessageWriter writer, I
                     writer.WriteMessageLine(StringsDiffer_1, expectedString.Length, mismatchExpected);
                 else
                     writer.WriteMessageLine(StringsDiffer_2, expectedString.Length, actualString.Length, mismatchExpected);
-                writer.WriteLine($"  Expected: {MsgUtils.FormatCollection(expected)}");
-                writer.WriteLine($"  But was:  {MsgUtils.FormatCollection(actual)}");
+                writer.WriteLine($"{TextMessageWriter.Pfx_Expected}{MsgUtils.FormatCollection(expected)}");
+                writer.WriteLine($"{TextMessageWriter.Pfx_Actual}{MsgUtils.FormatCollection(actual)}");
                 writer.WriteLine($"  First non-matching item at index [{failurePoint.Position}]: \"{failurePoint.ExpectedValue}\"");
                 return;
             }
@@ -346,13 +347,15 @@ private void DisplayEnumerableDifferences(MessageWriter writer, IEnumerable expe
 
         #region DisplayPropertyDifferences
 
-        private void DisplayPropertyDifferences(MessageWriter writer, int depth)
+        private void DisplayPropertyDifferences(MessageWriter writer, object? expected, object? actual, int depth)
         {
             if (_failurePoints.Count > depth)
             {
                 NUnitEqualityComparer.FailurePoint failurePoint = _failurePoints[depth];
 
-                writer.WriteMessageLine($"Values differ at property {failurePoint.PropertyName}");
+                writer.WriteLine($"{TextMessageWriter.Pfx_Expected}{MsgUtils.FormatValueProperties(expected)}");
+                writer.WriteLine($"{TextMessageWriter.Pfx_Actual}{MsgUtils.FormatValueProperties(actual)}");
+                writer.WriteLine($"  Values differ at property {failurePoint.PropertyName}:");
                 DisplayDifferences(writer, failurePoint.ExpectedValue, failurePoint.ActualValue, ++depth);
             }
         }

src/NUnitFramework/framework/Constraints/MsgUtils.cs

@@ -5,6 +5,8 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.Linq;
+using System.Reflection;
 using System.Text;
 using NUnit.Framework.Internal;
 
@@ -94,6 +96,55 @@ static MsgUtils()
             AddFormatter(next => val => val is Array valArray ? FormatArray(valArray) : next(val));
         }
 
+        /// <summary>
+        /// Try to format the properties of an object as a string.
+        /// </summary>
+        /// <param name="val">The object to format.</param>
+        /// <returns>Formatted string for all properties.</returns>
+        public static string FormatValueProperties(object? val)
+        {
+            if (val is null)
+                return "null";
+
+            Type valueType = val.GetType();
+
+            // If the type is a low level type, call our default formatter.
+            if (valueType.IsPrimitive || valueType == typeof(string) || valueType == typeof(decimal))
+                return FormatValue(val);
+
+            // If the type implements its own ToString() method, call that.
+            MethodInfo? toStringMethod = valueType.GetMethod(nameof(ToString), Type.EmptyTypes);
+            if (toStringMethod?.DeclaringType == valueType)
+                return FormatValueWithoutThrowing(val);
+
+            PropertyInfo[] properties = valueType.GetProperties(BindingFlags.Instance | BindingFlags.Public);
+            if (properties.Length == 0 || properties.Any(p => p.GetIndexParameters().Length > 0))
+            {
+                // We can't print if there are no properties.
+                // We also can't deal with indexer properties as we don't know the range of valid values.
+                return FormatValue(val);
+            }
+
+            var sb = new StringBuilder();
+            sb.Append(valueType.Name);
+            sb.Append(" { ");
+
+            bool firstProperty = true;
+            foreach (var property in properties)
+            {
+                if (!firstProperty)
+                    sb.Append(", ");
+                else
+                    firstProperty = false;
+
+                sb.Append(property.Name);
+                sb.Append(" = ");
+                sb.Append(FormatValue(property.GetValue(val, null)));
+            }
+            sb.Append(" }");
+            return sb.ToString();
+        }
+
 #if NETFRAMEWORK
         [System.Runtime.ExceptionServices.HandleProcessCorruptedStateExceptions]
 #endif

src/NUnitFramework/framework/Internal/ExceptionHelper.cs

@@ -199,13 +199,16 @@ private static List<Exception> FlattenExceptionHierarchy(Exception exception)
         {
             Guard.ArgumentNotNull(parameterlessDelegate, parameterName);
 
-            try
-            {
-                await parameterlessDelegate();
-            }
-            catch (Exception e)
+            using (new TestExecutionContext.IsolatedContext())
             {
-                return e;
+                try
+                {
+                    await parameterlessDelegate();
+                }
+                catch (Exception e)
+                {
+                    return e;
+                }
             }
 
             return null;

src/NUnitFramework/tests/Assertions/AssertThatAsyncTests.cs

@@ -159,13 +159,7 @@ public async Task AssertionFails_WhenDelegateThrowsEvenWithRetry()
         private static async Task AssertAssertionFailsAsync(Func<Task> assertion)
         {
             await Assert.ThatAsync(
-                async () =>
-                {
-                    using (new TestExecutionContext.IsolatedContext())
-                    {
-                        await assertion();
-                    }
-                },
+                async () => await assertion(),
                 Throws.InstanceOf<AssertionException>());
         }
     }

src/NUnitFramework/tests/Assertions/AssertThatTests.cs

@@ -551,37 +551,53 @@ public void AssertThatEqualsWithStructWithSomeToleranceAwareMembers()
         [Test]
         public void AssertThatEqualsWithStructMemberDifferences()
         {
-            var instance = new StructWithSomeToleranceAwareMembers(1, 1.1, "1.1", SomeEnum.One);
+            var instance = new StructWithSomeToleranceAwareMembers(1, 0.123, "1.1", SomeEnum.One);
 
             Assert.That(() =>
-                Assert.That(new StructWithSomeToleranceAwareMembers(2, 1.1, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer()),
-                Throws.InstanceOf<AssertionException>().With.Message.Contains("at property StructWithSomeToleranceAwareMembers.ValueA")
-                                                       .And.Message.Contains("Expected: 1"));
+                Assert.That(new StructWithSomeToleranceAwareMembers(2, 0.123, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer()),
+                    Throws.InstanceOf<AssertionException>().With
+                        .Message.Contains("Expected: StructWithSomeToleranceAwareMembers { ValueA = 1, ValueB = 0.123d, ValueC = \"1.1\", ValueD = One }").And
+                        .Message.Contains("But was:  StructWithSomeToleranceAwareMembers { ValueA = 2, ValueB = 0.123d, ValueC = \"1.1\", ValueD = One }").And
+                        .Message.Contains("at property StructWithSomeToleranceAwareMembers.ValueA").And
+                        .Message.Contains("Expected: 1").And
+                        .Message.Contains("But was:  2"));
             Assert.That(() =>
-                Assert.That(new StructWithSomeToleranceAwareMembers(1, 1.2, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer()),
-                Throws.InstanceOf<AssertionException>().With.Message.Contains("at property StructWithSomeToleranceAwareMembers.ValueB")
-                                                       .And.Message.Contains("Expected: 1.1"));
+                Assert.That(new StructWithSomeToleranceAwareMembers(1, 0.246, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer()),
+                    Throws.InstanceOf<AssertionException>().With
+                        .Message.Contains("Expected: StructWithSomeToleranceAwareMembers { ValueA = 1, ValueB = 0.123d, ValueC = \"1.1\", ValueD = One }").And
+                        .Message.Contains("But was:  StructWithSomeToleranceAwareMembers { ValueA = 1, ValueB = 0.246d, ValueC = \"1.1\", ValueD = One }").And
+                        .Message.Contains("at property StructWithSomeToleranceAwareMembers.ValueB").And
+                        .Message.Contains("Expected: 0.123d").And
+                        .Message.Contains("But was:  0.246d"));
             Assert.That(() =>
-                Assert.That(new StructWithSomeToleranceAwareMembers(1, 1.1, "1.2", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer()),
-                Throws.InstanceOf<AssertionException>().With.Message.Contains("at property StructWithSomeToleranceAwareMembers.ValueC")
-                                                       .And.Message.Contains("Expected: \"1.1\""));
+                Assert.That(new StructWithSomeToleranceAwareMembers(1, 0.123, "2.2", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer()),
+                    Throws.InstanceOf<AssertionException>().With
+                        .Message.Contains("Expected: StructWithSomeToleranceAwareMembers { ValueA = 1, ValueB = 0.123d, ValueC = \"1.1\", ValueD = One }").And
+                        .Message.Contains("But was:  StructWithSomeToleranceAwareMembers { ValueA = 1, ValueB = 0.123d, ValueC = \"2.2\", ValueD = One }").And
+                        .Message.Contains("at property StructWithSomeToleranceAwareMembers.ValueC").And
+                        .Message.Contains("Expected: \"1.1\"").And
+                        .Message.Contains("But was:  \"2.2\""));
             Assert.That(() =>
-                Assert.That(new StructWithSomeToleranceAwareMembers(1, 1.1, "1.1", SomeEnum.Two), Is.EqualTo(instance).UsingPropertiesComparer()),
-                Throws.InstanceOf<AssertionException>().With.Message.Contains("at property StructWithSomeToleranceAwareMembers.ValueD")
-                                                       .And.Message.Contains("Expected: One"));
+                Assert.That(new StructWithSomeToleranceAwareMembers(1, 0.123, "1.1", SomeEnum.Two), Is.EqualTo(instance).UsingPropertiesComparer()),
+                    Throws.InstanceOf<AssertionException>().With
+                        .Message.Contains("Expected: StructWithSomeToleranceAwareMembers { ValueA = 1, ValueB = 0.123d, ValueC = \"1.1\", ValueD = One }").And
+                        .Message.Contains("But was:  StructWithSomeToleranceAwareMembers { ValueA = 1, ValueB = 0.123d, ValueC = \"1.1\", ValueD = Two }").And
+                        .Message.Contains("at property StructWithSomeToleranceAwareMembers.ValueD").And
+                        .Message.Contains("Expected: One").And
+                        .Message.Contains("But was:  Two"));
 
             /*
              * Uncomment this block to see the actual exception messages. Test will fail.
              *
             Assert.Multiple(() =>
             {
-                Assert.That(new StructWithSomeToleranceAwareMembers(2, 1.1, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer());
-                Assert.That(new StructWithSomeToleranceAwareMembers(1, 1.1, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer());
-                Assert.That(new StructWithSomeToleranceAwareMembers(1, 1.2, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer());
-                Assert.That(new StructWithSomeToleranceAwareMembers(1, 1.1, "1.2", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer());
-                Assert.That(new StructWithSomeToleranceAwareMembers(1, 1.1, "1.1", SomeEnum.Two), Is.EqualTo(instance).UsingPropertiesComparer());
+                Assert.That(new StructWithSomeToleranceAwareMembers(2, 0.123, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer());
+                Assert.That(new StructWithSomeToleranceAwareMembers(1, 0.246, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer());
+                Assert.That(new StructWithSomeToleranceAwareMembers(1, 0.123, "1.1", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer());
+                Assert.That(new StructWithSomeToleranceAwareMembers(1, 0.123, "1.2", SomeEnum.One), Is.EqualTo(instance).UsingPropertiesComparer());
+                Assert.That(new StructWithSomeToleranceAwareMembers(1, 0.123, "1.1", SomeEnum.Two), Is.EqualTo(instance).UsingPropertiesComparer());
             });
-            */
+             */
         }
 
         private enum SomeEnum
@@ -604,11 +620,6 @@ public StructWithSomeToleranceAwareMembers(int valueA, double valueB, string val
             public double ValueB { get; }
             public string ValueC { get; }
             public SomeEnum ValueD { get; }
-
-            public override string ToString()
-            {
-                return $"{ValueA} {ValueB} '{ValueC}' {ValueD}";
-            }
         }
 
         [Test]

src/NUnitFramework/tests/Assertions/AssertThrowsAsyncTests.cs

@@ -73,6 +73,13 @@ public void ThrowsConstraintReturnsCorrectException()
             CheckForSpuriousAssertionResults();
         }
 
+        [Test]
+        public void ThrowsAsyncIsNotAffectedByAssertionsInDelegate()
+        {
+            Assert.ThrowsAsync<AssertionException>(
+                () => Assert.ThatAsync(AsyncTestDelegates.ThrowsArgumentExceptionAsync, Throws.InvalidOperationException));
+        }
+
         [Test]
         public void CorrectExceptionIsReturnedToMethod()
         {

src/NUnitFramework/tests/Constraints/ConstraintTestBase.cs

@@ -49,16 +49,12 @@ public void SucceedsWithGoodValues(object value)
         [Test, TestCaseSource(nameof(FailureData))]
         public void FailsWithBadValues(object badValue, string message)
         {
-            string nl = Environment.NewLine;
-
             var constraintResult = TheConstraint.ApplyTo(badValue);
             Assert.That(constraintResult.IsSuccess, Is.False);
 
             TextMessageWriter writer = new TextMessageWriter();
             constraintResult.WriteMessageTo(writer);
-            Assert.That(writer.ToString(), Is.EqualTo(
-                TextMessageWriter.Pfx_Expected + ExpectedDescription + nl +
-                TextMessageWriter.Pfx_Actual + message + nl));
+            Assert.That(writer.ToString(), Does.Contain(ExpectedDescription).And.Contains(message));
         }
     }
 }