And... in the last versions, did it work well? or not too?

[Fact]
        public async Task GetSomething_WhenTheTesterSomethingExists_ReturnsTheSomething()
        {
            // Arrange
            this.pactBuilder
                .UponReceiving("A GET request to retrieve the something")
                    .Given("There is a something with id 'tester'")
                    .WithRequest(HttpMethod.Get, "/somethings/tester")
                    .WithHeader("Accept", "application/json")
                .WillRespond()
                    .WithStatus(HttpStatusCode.OK)
                    .WithHeader("Content-Type", "application/json; charset=utf-8")
                    .WithJsonBody(new
                    {
                        id = "tester",
                        firstName = "Totally",
                        lastName = "Awesome"
                    });

            await this.pactBuilder.VerifyAsync(async ctx =>
            {
                // Act
                var client = new SomethingApiClient(ctx.MockServerUri);
                var something = await client.GetSomething("tester");

                // Assert
                Assert.Equal("tester", something.Id);
            });
        }