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use crate::mock::Mock; use crate::mock_actor::MockActor; use crate::server_actor::ServerActor; use async_std::net::TcpStream; use bastion::{run, Bastion}; use log::debug; use std::net::SocketAddr; use std::time::Duration; /// An HTTP web-server running in the background to behave as one of your dependencies using `Mock`s for testing purposes. /// /// Each instance of `MockServer` is fully isolated: `start` takes care of finding a random port /// available on your local machine which is assigned to the new `MockServer`. /// /// ## Best practices /// /// You should use one instance of `MockServer` for each REST API that your application interacts /// with and needs mocking for testing purposes. /// /// You should use one instance of `MockServer` for each test, to ensure full isolation and /// no cross-test interference. /// /// You can register as many `Mock`s as your scenario requires on a `MockServer`. pub struct MockServer { server_actor: ServerActor, mock_actor: MockActor, } impl MockServer { /// Start a new instance of a `MockServer`. /// /// Each instance of `MockServer` is fully isolated: `start` takes care of finding a random port /// available on your local machine which is assigned to the new `MockServer`. /// /// You should use one instance of `MockServer` for each REST API that your application interacts /// with and needs mocking for testing purposes. /// /// ### Example: /// ```rust /// use wiremock::{MockServer, Mock, ResponseTemplate}; /// use wiremock::matchers::method; /// /// #[async_std::main] /// async fn main() { /// // Arrange /// let mock_server_one = MockServer::start().await; /// let mock_server_two = MockServer::start().await; /// /// assert!(mock_server_one.address() != mock_server_two.address()); /// /// let mock = Mock::given(method("GET")).respond_with(ResponseTemplate::new(200)); /// // Registering the mock with the first mock server - it's now effective! /// // But it *won't* be used by the second mock server! /// mock_server_one.register(mock).await; /// /// // Act /// /// let status = surf::get(&mock_server_one.uri()) /// .await /// .unwrap() /// .status(); /// assert_eq!(status.as_u16(), 200); /// /// // This would have matched our mock, but we haven't registered it for `mock_server_two`! /// // Hence it returns a 404, the default response when no mocks matched on the mock server. /// let status = surf::get(&mock_server_two.uri()) /// .await /// .unwrap() /// .status(); /// assert_eq!(status.as_u16(), 404); /// } /// ``` pub async fn start() -> Self { // Should I put this behind a lazy_static to call them only once? Bastion::init(); Bastion::start(); let mock_actor = MockActor::start(); // Start our mock server let server_actor = ServerActor::start(mock_actor.clone()).await; let mock_server = Self { server_actor, mock_actor, }; // Wait (up to 2 second) for the actor to start listening on the specified socket for _ in 0..40 { if TcpStream::connect(mock_server.address()).await.is_ok() { break; } // Sleep between retries async_std::task::sleep(Duration::from_millis(50)).await; } mock_server } /// Register a `Mock` on an instance of `MockServer`. /// /// Be careful! `Mock`s are not effective until they are `mount`ed or `register`ed on a `MockServer`. /// /// `register` is an asynchronous method, make sure to `.await` it! /// /// ### Example: /// ```rust /// use wiremock::{MockServer, Mock, ResponseTemplate}; /// use wiremock::matchers::method; /// /// #[async_std::main] /// async fn main() { /// // Arrange /// let mock_server = MockServer::start().await; /// /// let response = ResponseTemplate::new(200); /// /// let mock = Mock::given(method("GET")).respond_with(response.clone()); /// // Registering the mock with the mock server - it's now effective! /// mock_server.register(mock).await; /// /// // We won't register this mock instead. /// let unregistered_mock = Mock::given(method("GET")).respond_with(response); /// /// // Act /// let status = surf::get(&mock_server.uri()) /// .await /// .unwrap() /// .status(); /// assert_eq!(status.as_u16(), 200); /// /// // This would have matched `unregistered_mock`, but we haven't registered it! /// // Hence it returns a 404, the default response when no mocks matched on the mock server. /// let status = surf::post(&mock_server.uri()) /// .await /// .unwrap() /// .status(); /// assert_eq!(status.as_u16(), 404); /// } /// ``` pub async fn register(&self, mock: Mock) { self.mock_actor.register(mock).await; } /// Drop all mounted `Mock`s from an instance of `MockServer`. /// /// ### Example: /// ```rust /// use wiremock::{MockServer, Mock, ResponseTemplate}; /// use wiremock::matchers::method; /// /// #[async_std::main] /// async fn main() { /// // Arrange /// let mock_server = MockServer::start().await; /// /// let response = ResponseTemplate::new(200); /// Mock::given(method("GET")).respond_with(response).mount(&mock_server).await; /// /// // Act /// let status = surf::get(&mock_server.uri()) /// .await /// .unwrap() /// .status(); /// assert_eq!(status.as_u16(), 200); /// /// // Reset the server /// mock_server.reset().await; /// /// // This would have matched our mock, but we have dropped it resetting the server! /// let status = surf::post(&mock_server.uri()) /// .await /// .unwrap() /// .status(); /// assert_eq!(status.as_u16(), 404); /// } /// ``` pub async fn reset(&self) { self.mock_actor.reset().await; } /// Verify that all mounted `Mock`s on this instance of `MockServer` have satisfied /// their expectations on their number of invocations. async fn verify(&self) -> bool { self.mock_actor.verify().await } /// Return the base uri of this running instance of `MockServer`, e.g. `http://127.0.0.1:4372`. /// /// Use this method to compose uris when interacting with this instance of `MockServer` via /// an HTTP client. /// /// ### Example: /// ```rust /// use wiremock::MockServer; /// /// #[async_std::main] /// async fn main() { /// // Arrange - no mocks mounted /// /// let mock_server = MockServer::start().await; /// // Act /// let uri = format!("{}/health_check", &mock_server.uri()); /// let status = surf::get(uri).await.unwrap().status(); /// /// // Assert - default response /// assert_eq!(status.as_u16(), 404); /// } /// ``` pub fn uri(&self) -> String { format!("http://{}", self.server_actor.address) } /// Return the socket address of this running instance of `MockServer`, e.g. `127.0.0.1:4372`. /// /// Use this method to interact with the `MockServer` using `TcpStream`s. /// /// ### Example: /// ```rust /// use wiremock::MockServer; /// use std::net::TcpStream; /// /// #[async_std::main] /// async fn main() { /// // Act - the server is started /// let mock_server = MockServer::start().await; /// /// // Assert - we can connect to it /// assert!(TcpStream::connect(mock_server.address()).is_ok()); /// } /// ``` pub fn address(&self) -> &SocketAddr { &self.server_actor.address } } impl Drop for MockServer { // Clean up when the `MockServer` instance goes out of scope. fn drop(&mut self) { debug!("Verify mock expectations."); if !run!(self.verify()) { panic!("Verification failed: mock expectations have not been satisfied."); } debug!("Killing server actor."); self.server_actor.actor_ref.kill().unwrap(); debug!("Killed server actor."); debug!("Killing mock actor."); self.mock_actor.actor_ref.kill().unwrap(); debug!("Killed mock actor."); } }