Response null instead of mocked resource

Similar to pact-js I expected the response to be mocked so I could test an API client against pact’s mock server. I modified example code to match my implementation as well. My codebase uses OpenAPI to generate the api client.

However I could not assert any of my tests due to the response being always null.

Reproduction steps with an OpenAPI generated petstore: https://github.com/tomsiwik/oas-pactnet-error

Now I’m not sure if this is csharp-netcore’s client generator or that I’m using PactNet version 4.0.0-beta.3. Is this a bug or am I doing something wrong here? Thanks in advance.

[tomsiwik]

Added: LogLevel = PactLogLevel.Debug to PactConfig. I can’t specify a log-file though.

# Just in case...
DEBUG=true dotnet test petstore

  Determining projects to restore...
  All projects are up-to-date for restore.
  Petstore -> /Users/tom/Code/problem/petstore/src/Petstore/bin/Debug/net6.0/Petstore.dll
  Petstore.Test -> /Users/tom/Code/problem/petstore/src/Petstore.Test/bin/Debug/net6.0/Petstore.Test.dll
Test run for /Users/tom/Code/problem/petstore/src/Petstore.Test/bin/Debug/net6.0/Petstore.Test.dll (.NETCoreApp,Version=v6.0)
Microsoft (R) Test Execution Command Line Tool Version 17.0.0+68bd10d3aee862a9fbb0bac8b3d474bc323024f3
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
[xUnit.net 00:00:01.07]     Petstore.Test.Api.PetApiTests.FindPetByStatus_WhenCalled_ReturnsPet [FAIL]
  Failed Petstore.Test.Api.PetApiTests.FindPetByStatus_WhenCalled_ReturnsPet [370 ms]
  Error Message:
   Expected pets not to be <null>.

With configuration:
- Use declared types and members
- Compare enums by value
- Include all non-private properties
- Include all non-private fields
- Match member by name (or throw)
- Without automatic conversion.
- Without automatic conversion.
- Be strict about the order of items in byte arrays

  Stack Trace:
     at FluentAssertions.Execution.XUnit2TestFramework.Throw(String message)
   at FluentAssertions.Execution.TestFrameworkProvider.Throw(String message)
   at FluentAssertions.Execution.CollectingAssertionStrategy.ThrowIfAny(IDictionary`2 context)
   at FluentAssertions.Equivalency.EquivalencyValidator.AssertEquality(EquivalencyValidationContext context)
   at FluentAssertions.Collections.CollectionAssertions`2.BeEquivalentTo[TExpectation](IEnumerable`1 expectation, Func`2 config, String because, Object[] becauseArgs)
   at FluentAssertions.Collections.CollectionAssertions`2.BeEquivalentTo(Object[] expectations)
   at Petstore.Test.Api.PetApiTests.<>c__DisplayClass2_0.<<FindPetByStatus_WhenCalled_ReturnsPet>b__0>d.MoveNext() in /Users/tom/Code/problem/petstore/src/Petstore.Test/Api/PetApiTests.cs:line 93
--- End of stack trace from previous location ---
   at PactNet.PactBuilder.VerifyAsync(Func`2 interact)
   at Petstore.Test.Api.PetApiTests.FindPetByStatus_WhenCalled_ReturnsPet() in /Users/tom/Code/problem/petstore/src/Petstore.Test/Api/PetApiTests.cs:line 87
--- End of stack trace from previous location ---
  Standard Output Messages:
 Mock server logs:

 [DEBUG][pact_mock_server::hyper_server] Creating pact request from hyper request
 [DEBUG][pact_mock_server::hyper_server] Extracting query from uri /pet/findByStatus?status=available
 [INFO][pact_mock_server::hyper_server] Received request HTTP Request ( method: GET, path: /pet/findByStatus, query: Some({"status": ["available"]}), headers: Some({"connection": ["Keep-Alive"], "user-agent": ["OpenAPI-Generator/1.0.0/csharp"], "accept-encoding": ["gzip", "deflate"], "host": ["127.0.0.1:49562"], "accept": ["application/json"]}), body: Empty )
 [INFO][pact_matching] comparing to expected HTTP Request ( method: GET, path: /pet/findByStatus, query: Some({"status": ["available"]}), headers: Some({"Accept": ["application/json"]}), body: Missing )
 [DEBUG][pact_matching]      body: ''
 [DEBUG][pact_matching]      matching_rules: MatchingRules { rules: {QUERY: MatchingRuleCategory { name: QUERY, rules: {} }, HEADER: MatchingRuleCategory { name: HEADER, rules: {} }, PATH: MatchingRuleCategory { name: PATH, rules: {} }} }
 [DEBUG][pact_matching]      generators: Generators { categories: {} }
 [DEBUG][pact_matching::matchers] String -> String: comparing '/pet/findByStatus' to '/pet/findByStatus' using Equality (false)
 [DEBUG][pact_matching] expected content type = '*/*', actual content type = '*/*'
 [DEBUG][pact_matching] content type header matcher = 'RuleList { rules: [], rule_logic: And, cascaded: false }'
 [DEBUG][pact_matching::matchers] String -> String: comparing 'available' to 'available' using Equality (false)
 [DEBUG][pact_matching] --> Mismatches: []
 [DEBUG][pact_mock_server::hyper_server] Test context = {"mockServer": Object({"href": String("http://127.0.0.1:49562"), "port": Number(49562)})}
 [INFO][pact_mock_server::hyper_server] Request matched, sending response HTTP Response ( status: 200, headers: Some({"Content-Type": ["application/json; charset=utf-8"]}), body: Present(16 bytes, application/json) )
 [DEBUG][pact_mock_server::hyper_server]      body: '[{"name":"Max"}]'

Failed!  - Failed:     1, Passed:    55, Skipped:     0, Total:    56, Duration: 398 ms - /Users/tom/Code/problem/petstore/src/Petstore.Test/bin/Debug/net6.0/Petstore.Test.dll (net6.0)

The assertion (inside async Task):

var example = new Pet(1, "Max", null, new List<string>());

await this.pact.VerifyAsync(async ctx =>
{
  var client = new PetApi(ctx.MockServerUri.ToString());

  List<Pet> pets = await client.FindPetsByStatusAsync("available"); // body: '[{"name":"Max"}]'

  pets.Should().BeEquivalentTo(new[] { example }); // Expected pets not to be <null>.
});

Hope this helps.

[mefellows]

Hi @tomsiwik, I noticed you closed the issue. Did you get to the bottom of it?