Theorem.MockNet.Http

The package provides a friendly mocking framework to unit test the System.Net.Http namespace.

Main features:

works with any .NET unit testing and mocking library
convenient syntax to setup http request and response messages and their properties
ability to validate request headers and content matching with lambda predicates
ability to specify status code, headers and content to be returned from the HTTP call

Examples:

A quick and simple example. This sample mocks a call to the https://jsonplaceholder.typeicode.com/todos/1 resource to return a status code of 201 Created.

using Theorem.MockNet.Http;
using Xunit; // used here for Asserting.

...

var mock = new MockHttpClient();

mock.SetupGet("/todos/1").ReturnsAsync(201);

var result = await mock.Object.GetAsync("/todos/1");

Assert.Equal(201, (int)result.StatusCode);

Lets look at a more real life example:

Todo model

public class Todo
{
    public int UserId { get; set; }
    public int Id { get; set; }
    public string Title { get; set; }
    public bool Completed { get; set; }

    public Todo() {}

    public Todo(int id, int userId, string title) => (Id, UserId, Title) = (id, userId, title);
}

Service to consume the api

using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
using SystemStringContent = System.Net.Http.StringContent;

public class TodoService
{
    private HttpClient _httpClient;

    public TodoService(HttpClient httpClient)
    {
        this._httpClient = httpClient;
    }

    public Task<Todo> GetAsync(int id) => GetAsync($"/todos/{id}");

    private async Task<Todo> GetAsync(string requestUri)
    {
        var response = await this._httpClient.GetAsync(requestUri);

        if (!response.IsSuccessStatusCode)
        {
            throw new Exception("Todo not found");
        }

        var json = await response.Content.ReadAsStringAsync();

        return JsonConvert.DeserializeObject<Todo>(json);
    }

    public async Task<Todo> CreateAsync(Todo todo)
    {
        var content = new SystemStringContent(JsonConvert.SerializeObject(todo), Encoding.UTF8, "application/json");

        var response = await this._httpClient.PostAsync("/todos", content);

        if (response.IsSuccessStatusCode &&
            response.Headers.Location is Uri uri)
        {
            return await GetAsync(uri.ToString());
        }

        throw new Exception("Error creating todo");
    }
}

And the unit test for the TodoService

using Theorem.MockNet.Http;
using Xunit;

public class TodoServiceTests
{
    private TodoService service;
    private MockHttpClient mock;

    public TodoServiceTests()
    {
        this.mock = new MockHttpClient();
        this.service = new TodoService(mock.Object);
    }

    [Fact]
    public async Task GetAsync_should_return_expected_todo()
    {
        var expected = new Todo(1, 456, "go shopping");

        mock.SetupGet("/todos/1").ReturnsAsync(201, expected);

        var actual = await service.GetAsync(1);

        Assert.Equal(expected.Id, actual.Id);
        Assert.Equal(expected.UserId, actual.UserId);
        Assert.Equal(expected.Title, actual.Title);
        Assert.Equal(expected.Completed, actual.Completed);
    }

    [Fact]
    public async Task GetAsync_should_throw_exception_when_invalid_status_code_is_returned()
    {
        mock.SetupGet("/todos/1").ReturnsAsync(404);

        await Assert.ThrowsAsync<Exception>(() => service.GetAsync(1));
    }

    [Fact]
    public async Task CreateAsync_should_create_and_return_new_todo()
    {
        var todo = new Todo(0, 456, "go shopping");
        var expected = new Todo(2, 456, "go shopping");

        var responseHeaders = new HttpResponseHeaders();
        responseHeaders.Add("Location", $"https://localhost/todos/{expected.Id}");

        // pass lambda predicate to validate request content
        // response from the HTTP Post method will have 201 status code and Location header
        mock.SetupPost<Todo>("/todos",
            content: x => x.UserId == todo.UserId &&
                x.Title == todo.Title &&
                x.Completed == todo.Completed).ReturnsAsync(201, responseHeaders);

        mock.SetupGet($"/todos/{expected.Id}").ReturnsAsync(expected);

        var actual = await service.CreateAsync(todo);

        Assert.Equal(expected.Id, actual.Id);
        Assert.Equal(expected.UserId, actual.UserId);
        Assert.Equal(expected.Title, actual.Title);
        Assert.Equal(expected.Completed, actual.Completed);
    }

    [Fact]
    public async Task CreateAsync_should_throw_exception_when_invalid_status_code_is_returned()
    {
        mock.SetupPost("/todos").ReturnsAsync(404);

        await Assert.ThrowsAsync<Exception>(() => service.CreateAsync(new Todo()));
    }

    [Fact]
    public async Task CreateAsync_should_throw_exception_when_missing_location_header()
    {
        mock.SetupPost("/todos").ReturnsAsync(200);

        await Assert.ThrowsAsync<Exception>(() => service.CreateAsync(new Todo()));
    }
}

For more examples on how to test other HttpClient aspects including testing headers and content body being sent to the endpoint as well as headers being returned please see tests/MockNet.Tests/Playground.cs

About TheoremOne

This software is lovingly maintained and funded by TheoremOne. At TheoremOne, we specialize in solving difficult computer science problems for startups and the enterprise.

At TheoremOne we believe in and support open source software.

Check out more of our open source software at TheoremOne Labs.
Learn more about our work.
Hire us to work on your project.
Want to join the team?

TheoremOne and the TheoremOne logo are trademarks or registered trademarks of TheoremOne, LLC.

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