[FEATURE] Increase unit and integration test coverage

[guibranco]

Description

The current C# HTTP client library needs improved test coverage to ensure robustness and catch edge cases. This includes both unit tests and integration tests that cover a wider range of scenarios.

Objective

• Expand unit test coverage to include more edge cases, failure scenarios, and specific API behaviors.
• Add integration tests to validate end-to-end functionality with external dependencies mocked.

Tasks

1. Unit Tests:

   • Use XUnit for writing the test cases.
   • Use NSubstitute for mocking internal dependencies.
   • Use FluentAssertions for asserting results and better readability.
   • Utilize Snapshooter for snapshot testing and result comparisons to ensure consistent responses over time.

2. Integration Tests:

   • Use WireMock to mock HTTP requests and simulate different responses from external services (success, failures, timeouts).
   • Write integration tests that simulate real-world scenarios with the library making requests to mocked endpoints.

Requirements:

• Unit Test Coverage:

  • Cover methods in the library that currently lack sufficient testing.
  • Add tests for various input/output combinations, edge cases, and error handling scenarios.

• Integration Test Scenarios:

  • Simulate successful HTTP responses, error conditions (404, 500), and network failures.
  • Verify the proper handling of timeout and retry policies (if applicable).
  • Ensure the client handles different HTTP methods (GET, POST, PUT, DELETE) correctly.

Test Strategy:

• XUnit for test framework.
• NSubstitute for mocking dependencies and external services.
• FluentAssertions for clearer and more expressive assertions.
• Snapshooter for comparison of API responses and ensuring consistent behavior.
• WireMock for simulating different API responses, ensuring the HTTP client reacts correctly in various scenarios.

Example:

public class HttpClientTests
{
    private readonly IExternalService _mockService = Substitute.For<IExternalService>();

    [Fact]
    public async Task Should_Return_Correct_Response_On_Success()
    {
        // Arrange
        var expectedResponse = new ApiResponse { ... };
        var client = new HttpClient(_mockService);

        _mockService
            .GetAsync(Arg.Any<string>())
            .Returns(Task.FromResult(expectedResponse));

        // Act
        var result = await client.GetDataAsync();

        // Assert
        result.Should().BeEquivalentTo(expectedResponse);
        Snapshot.Match(result);  // Snapshooter for result comparison
    }
}

Additional Notes:

• The tests should be structured in a way that they can run as part of CI pipelines.
• Ensure high code coverage without compromising the readability and maintainability of the test cases.

Deliverables:

• Increased unit test coverage with all major code paths covered.
• Well-written integration tests for key scenarios with WireMock and snapshot testing using Snapshooter.
• Clear and consistent test results using FluentAssertions for readability.

[gitauto-ai[bot]]

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