# FakeHTTP
[](https://circleci.com/gh/ishikawa/ex_fake_http)
[](https://hex.pm/packages/ex_fake_http)
This library provides a scriptable HTTP server for testing HTTP based service (e.g. REST API). It makes easy to set up the server's resposens and test your code sends expected HTTP requests.
## Install
To use FakeHTTP in your Mix projects, first add FakeHTTP as a dependency.
```elixir
def deps do
[
{:ex_fake_http, "~> 0.2.0", only: :test}
]
end
```
After adding FakeHTTP as a dependency, run `mix deps.get` to install it.
## Usage
The only public module in this library is `FakeHTTP.Server` module.
`FakeHTTP.Server` implements full-fledged HTTP server. It establishes a real TCP
connection between it and a client. You can use it the same way that you use
other mocking libraries:
1. Start a process of server.
2. Script the mock responses.
3. Run your code.
4. Verify that the expected requests were made.
```elixir
defmodule YourApp.YourModuleTest do
# Each test has its `FakeHTTP.Server` instance.
# So it can be configured with `async` option enabled.
use ExUnit.Case, async: true
alias YourApp.ChatService
setup_all do
# Launch a HTTP server and internal Erlang process to
# manage HTTP server.
server = start_supervised!(FakeHTTP.Server)
base_url = FakeHTTP.Server.base_url(server)
{:ok, %{server: server, base_url: base_url}}
end
setup %{server: server} do
# Reset internal states before each test started.
FakeHTTP.Server.reset(server)
:ok
end
test "GET from REST API", %{server: server, base_url: base_url} do
path = "/messages/1"
auth_header = "Basic dGVzdDp0ZXN0"
# Register an expected response which the server should return for
# the next request from a client.
FakeHTTP.Server.enqueue(server, %{message: "hello"})
# The started server is a real HTTP server. You can use your favorite
# HTTP library to make a HTTP request without monkey-patched mocking.
assert {:ok, response} = HTTPoison.get(base_url <> path, %{"Authorization" => auth_header})
assert response.status_code == 200
assert :proplists.get_value("content-type", response.headers) == "application/json"
assert Jason.decode!(response.body) == %{"message" => "hello"}
# Verify that the expected requests were made.
{:ok, req} = FakeHTTP.Server.take(server)
# Notice the `req` is an instance of `FakeHTTP.Request`.
assert req.method == :get
assert req.request_path == path
assert req.headers["authorization"] == auth_header
end
end
```
## License
MIT
