Match.Type throws an exception on an attribute of type Object

[lacajenne]

Version information:

• OS: Windows x64
• PactNet Version: 5.0.0-beta.2
• .Net Version: 8.0
• Pact Broker Version (if applicable): n.a.

Describe the bug
We are writing consumer tests for an event-driven system.
The Match.Type method, when working on an attribute of type Object, throws an exception with this error message:
---- Expected property events[0].Data to be a dictionary or collection of key-value pairs that is keyed to type System.String. It implements .

Steps To Reproduce
Write a consumer test validating an object belonging to a class like the following

public sealed class TestDataClass
{
public WorkflowReference WorkflowReference { get; set; }
public string Title { get; set; }
public object Data { get; set; }
}

Expected behavior
It is possible to invoke Match.Type on the Data attribute.

Log Output
Stack Trace: 
ConfiguredMessageVerifier.Verify[T](Action1 handler) GainEventProcessorTests.ReceiveSomeStockEvents() line 120 RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor) MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr) ----- Inner Stack Trace ----- XUnit2TestFramework.Throw(String message) TestFrameworkProvider.Throw(String message) CollectingAssertionStrategy.ThrowIfAny(IDictionary2 context)
AssertionScope.Dispose()
EquivalencyValidator.AssertEquality(Comparands comparands, EquivalencyValidationContext context)
GenericCollectionAssertions3.BeEquivalentTo[TExpectation](IEnumerable1 expectation, Func2 config, String because, Object[] becauseArgs) GenericCollectionAssertions3.BeEquivalentTo[TExpectation](IEnumerable1 expectation, String because, Object[] becauseArgs) <>c__DisplayClass2_0.<ReceiveSomeStockEvents>b__5(ICollection1 events) line 127
ConfiguredMessageVerifier.Verify[T](Action`1 handler)

[adamrodger]

Please could you attach the full verifier output log?

Generally speaking using object types is going to cause problems because the serialisation round trip might not have the appropriate type information to know how to deserialise the JSON in the pact file properly when verifying. Seeing the full logs will probably cast some light on that though.

[lacajenne]

Thanks. This is all I seem to find:

MessageContract.Tests.GainEventProcessorTests.ReceiveSomeStockEvents
 Source: GainEventProcessorTests.cs line 34
 Duration: 2,7 sec

Message: 
PactNet.Exceptions.PactMessageConsumerVerificationException : The message could not be verified by the consumer handler
---- Expected property events[0].Data to be a dictionary or collection of key-value pairs that is keyed to type System.String. It implements .

With configuration:

• Use declared types and members

• Compare enums by value

• Compare tuples by their properties

• Compare anonymous types by their properties

• Compare records by their members

• Include non-browsable members

• Include all non-private properties

• Include all non-private fields

• Match member by name (or throw)

• Be strict about the order of items in byte arrays

• Without automatic conversion.

  Stack Trace: 
  ConfiguredMessageVerifier.Verify[T](Action1 handler) GainEventProcessorTests.ReceiveSomeStockEvents() line 120 RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor) MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr) ----- Inner Stack Trace ----- XUnit2TestFramework.Throw(String message) TestFrameworkProvider.Throw(String message) CollectingAssertionStrategy.ThrowIfAny(IDictionary2 context)
  AssertionScope.Dispose()
  EquivalencyValidator.AssertEquality(Comparands comparands, EquivalencyValidationContext context)
  GenericCollectionAssertions3.BeEquivalentTo[TExpectation](IEnumerable1 expectation, Func2 config, String because, Object[] becauseArgs) GenericCollectionAssertions3.BeEquivalentTo[TExpectation](IEnumerable1 expectation, String because, Object[] becauseArgs) <>c__DisplayClass2_0.<ReceiveSomeStockEvents>b__5(ICollection1 events) line 127
  ConfiguredMessageVerifier.Verify[T](Action`1 handler)

[adamrodger]

@lacajenne You may need to enable the xUnit output in the PactConfig so get the full verifier output. It contains the logs from the Rust library, which is probably what's needed to investigate this. Also please turn the log level up to at least Debug.