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actix-extras/guide/src/qs_8.md
2017-12-31 17:26:32 -08:00

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# Testing
Every application should be well tested and. Actix provides the tools to perform unit and
integration tests.
## Unit tests
For unit testing actix provides request builder type and simple handler runner.
[*TestRequest*](../actix_web/test/struct.TestRequest.html) implements builder-like pattern.
You can generate `HttpRequest` instance with `finish()` method or you can
run your handler with `run()` or `run_async()` methods.
```rust
# extern crate http;
# extern crate actix_web;
use http::{header, StatusCode};
use actix_web::*;
use actix_web::test::TestRequest;
fn index(req: HttpRequest) -> HttpResponse {
if let Some(hdr) = req.headers().get(header::CONTENT_TYPE) {
if let Ok(s) = hdr.to_str() {
return httpcodes::HTTPOk.into()
}
}
httpcodes::HTTPBadRequest.into()
}
fn main() {
let resp = TestRequest::with_header("content-type", "text/plain")
.run(index)
.unwrap();
assert_eq!(resp.status(), StatusCode::OK);
let resp = TestRequest::default()
.run(index)
.unwrap();
assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
}
```
## Integration tests
There are several methods how you can test your application. Actix provides
[*TestServer*](../actix_web/test/struct.TestServer.html)
server that could be used to run whole application of just specific handlers
in real http server. At the moment it is required to use third-party libraries
to make actual requests, libraries like [reqwest](https://crates.io/crates/reqwest).
In simple form *TestServer* could be configured to use handler. *TestServer::new* method
accepts configuration function, only argument for this function is *test application*
instance. You can check [api documentation](../actix_web/test/struct.TestApp.html)
for more information.
```rust
# extern crate actix_web;
extern crate reqwest;
use actix_web::*;
use actix_web::test::TestServer;
fn index(req: HttpRequest) -> HttpResponse {
httpcodes::HTTPOk.into()
}
fn main() {
let srv = TestServer::new(|app| app.handler(index)); // <- Start new test server
let url = srv.url("/"); // <- get handler url
assert!(reqwest::get(&url).unwrap().status().is_success()); // <- make request
}
```
Other option is to use application factory. In this case you need to pass factory function
same as you use for real http server configuration.
```rust
# extern crate actix_web;
extern crate reqwest;
use actix_web::*;
use actix_web::test::TestServer;
fn index(req: HttpRequest) -> HttpResponse {
httpcodes::HTTPOk.into()
}
/// This function get called by http server.
fn create_app() -> Application {
Application::new()
.resource("/test", |r| r.h(index))
}
fn main() {
let srv = TestServer::with_factory(create_app); // <- Start new test server
let url = srv.url("/test"); // <- get handler url
assert!(reqwest::get(&url).unwrap().status().is_success()); // <- make request
}
```