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#![warn(missing_docs)] #![doc(html_logo_url = "https://raw.githubusercontent.com/lipanski/mockito/master/docs/logo-black.png")] //! //! Mockito is a library for creating HTTP mocks to be used in integration tests or for offline work. //! It runs an HTTP server on a local port which delivers, creates and remove the mocks. //! //! The server is run on a separate thread within the same process and will be removed //! at the end of the run. //! //! # Getting Started //! //! Using compiler flags, set the URL of your web client to address returned by `mockito::server_url()` or `mockito::server_address()`. //! //! ## Example //! //! ``` //! #[cfg(test)] //! use mockito; //! //! #[cfg(not(test))] //! let url = "https://api.twitter.com"; //! //! #[cfg(test)] //! let url = &mockito::server_url(); //! ``` //! //! Then start mocking: //! //! ## Example //! //! ``` //! #[cfg(test)] //! mod tests { //! use mockito::mock; //! //! #[test] //! fn test_something() { //! let _m = mock("GET", "/hello") //! .with_status(201) //! .with_header("content-type", "text/plain") //! .with_header("x-api-key", "1234") //! .with_body("world") //! .create(); //! //! // Any calls to GET /hello beyond this line will respond with 201, the //! // `content-type: text/plain` header and the body "world". //! } //! } //! ``` //! //! # Lifetime //! //! Just like any Rust object, a mock is available only through its lifetime. You'll want to assign //! the mocks to variables in order to extend and control their lifetime. //! //! Avoid using the underscore matcher when creating your mocks, as in `let _ = mock("GET", "/")`. //! This will end your mock's lifetime immediately. You can still use the underscore to prefix your variable //! names in an assignment, but don't limit it to just this one character. //! //! ## Example //! //! ``` //! use mockito::mock; //! //! let _m1 = mock("GET", "/long").with_body("hello").create(); //! //! { //! let _m2 = mock("GET", "/short").with_body("hi").create(); //! //! // Requests to GET /short will be mocked til here //! } //! //! // Requests to GET /long will be mocked til here //! ``` //! //! Note how I **didn't use the same variable name** for both mocks (e.g. `let _m`), as it would have ended the //! lifetime of the first mock with the second assignment. //! //! # Limitations //! //! Creating mocks from threads is currently not possible. Please use the main (test) thread for that. //! See the note on threads at the end for more details. //! //! # Asserts //! //! You can use the `Mock::assert` method to **assert that a mock was called**. In other words, the //! `Mock#assert` method can validate that your code performed the expected HTTP requests. //! //! By default, the method expects that only one request to your mock was triggered. //! //! ## Example //! //! ```no_run //! use std::net::TcpStream; //! use std::io::{Read, Write}; //! use mockito::{mock, server_address}; //! //! let mock = mock("GET", "/hello").create(); //! //! { //! // Place a request //! let mut stream = TcpStream::connect(server_address()).unwrap(); //! stream.write_all("GET /hello HTTP/1.1\r\n\r\n".as_bytes()).unwrap(); //! let mut response = String::new(); //! stream.read_to_string(&mut response).unwrap(); //! stream.flush().unwrap(); //! } //! //! mock.assert(); //! ``` //! //! If you're expecting more than 1 request, you can use the `Mock::expect` method to specify the exact amount of requests: //! //! ## Example //! //! ```no_run //! use std::net::TcpStream; //! use std::io::{Read, Write}; //! use mockito::{mock, server_address}; //! //! let mock = mockito::mock("GET", "/hello").expect(3).create(); //! //! for _ in 0..3 { //! // Place a request //! let mut stream = TcpStream::connect(server_address()).unwrap(); //! stream.write_all("GET /hello HTTP/1.1\r\n\r\n".as_bytes()).unwrap(); //! let mut response = String::new(); //! stream.read_to_string(&mut response).unwrap(); //! stream.flush().unwrap(); //! } //! //! mock.assert(); //! ``` //! //! The errors produced by the `assert` method contain information about the tested mock, but also about the //! **last unmatched request**, which can be very useful to track down an error in your implementation or //! a missing or incomplete mock. A coloured diff is also displayed. //! //! Here's an example of how a `Mock#assert` error looks like: //! //! ```text //! > Expected 1 request(s) to: //! //! POST /users //! bob //! //! ...but received 0 //! //! > The last unmatched request was: //! //! POST /users //! content-length: 5 //! alice //! //! > Difference: //! //! # A coloured diff //! //! ``` //! //! # Matchers //! //! Mockito can match your request by method, path, headers or body. //! //! Various matchers are provided by the `Matcher` type: exact, partial (regular expressions), any or missing. //! //! # Matching by path //! //! By default, the request path is compared by its exact value: //! //! ## Example //! //! ``` //! use mockito::mock; //! //! // Matched only calls to GET /hello //! let _m = mock("GET", "/hello").create(); //! ``` //! //! You can also match the path partially, by using a regular expression: //! //! ## Example //! //! ``` //! use mockito::{mock, Matcher}; //! //! // Will match calls to GET /hello/1 and GET /hello/2 //! let _m = mock("GET", Matcher::Regex(r"^/hello/(1|2)$".to_string())).create(); //! ``` //! //! Or you can catch all requests, by using the `Matcher::Any` variant: //! //! ## Example //! //! ``` //! use mockito::{mock, Matcher}; //! //! // Will match any GET request //! let _m = mock("GET", Matcher::Any).create(); //! ``` //! //! # Matching by header //! //! By default, headers are compared by their exact value. The header name letter case is ignored though. //! //! ## Example //! //! ``` //! use mockito::mock; //! //! let _m1 = mock("GET", "/hello") //! .match_header("content-type", "application/json") //! .with_body("{'hello': 'world'}") //! .create(); //! //! let _m2 = mock("GET", "/hello") //! .match_header("content-type", "text/plain") //! .with_body("world") //! .create(); //! //! // JSON requests to GET /hello will respond with JSON, while plain requests //! // will respond with text. //! ``` //! //! You can also match a header value with a *regular expressions*, by using the `Matcher::Regex` matcher: //! //! ## Example //! //! ``` //! use mockito::{mock, Matcher}; //! //! let _m = mock("GET", "/hello") //! .match_header("content-type", Matcher::Regex(r".*json.*".to_string())) //! .with_body("{'hello': 'world'}") //! .create(); //! ``` //! //! Or you can match a header *only by its field name*, by setting the `Mock::match_header` value to `Matcher::Any`. //! //! ## Example //! //! ``` //! use mockito::{mock, Matcher}; //! //! let _m = mock("GET", "/hello") //! .match_header("content-type", Matcher::Any) //! .with_body("something") //! .create(); //! //! // Requests containing any content-type header value will be mocked. //! // Requests not containing this header will return `501 Mock Not Found`. //! ``` //! //! You can mock requests that should be *missing a particular header field*, by setting the `Mock::match_header` //! value to `Matcher::Missing`. //! //! ## Example //! //! ``` //! use mockito::{mock, Matcher}; //! //! let _m = mock("GET", "/hello") //! .match_header("authorization", Matcher::Missing) //! .with_body("no authorization header") //! .create(); //! //! // Requests without the authorization header will be matched. //! // Requests containing the authorization header will return `501 Mock Not Found`. //! ``` //! //! # Matching by body //! //! You can match a request by its body by using the `Mock#match_body` method. //! By default the request body is ignored, similar to passing the `Matcher::Any` argument to the `match_body` method. //! //! You can match a body by an exact value: //! //! ## Example //! //! ``` //! use mockito::mock; //! //! // Will match requests to POST / whenever the request body is "hello" //! let _m = mock("POST", "/").match_body("hello").create(); //! ``` //! //! Or you can match the body by using a regular expression: //! //! ## Example //! //! ``` //! use mockito::{mock, Matcher}; //! //! // Will match requests to POST / whenever the request body *contains* the word "hello" (e.g. "hello world") //! let _m = mock("POST", "/").match_body(Matcher::Regex("hello".to_string())).create(); //! ``` //! //! Or you can match the body using a JSON object: //! //! ## Example //! //! ``` //! # extern crate mockito; //! #[macro_use] //! extern crate serde_json; //! use mockito::{mock, Matcher}; //! //! # fn main() { //! // Will match requests to POST / whenever the request body matches the json object //! let _m = mock("POST", "/").match_body(Matcher::Json(json!({"hello":"world"}))).create(); //! # } //! ``` //! //! If `serde_json::json!` is not exposed, you can use `Matcher::JsonString` the same way, //! but by passing a `String` to the matcher: //! //! ``` //! use mockito::{mock, Matcher}; //! //! // Will match requests to POST / whenever the request body matches the json object //! let _m = mock("POST", "/") //! .match_body( //! Matcher::JsonString("{\"hello\":\"world\"}".to_string()) //! ) //! .create(); //! ``` //! //! # The `AnyOf` matcher //! //! The `Matcher::AnyOf` construct takes a vector of matchers as arguments and will be enabled //! if at least one of the provided matchers matches the request. //! //! ## Example //! //! ``` //! use mockito::{mock, Matcher}; //! //! // Will match requests to POST / whenever the request body is either `hello=world` or `{"hello":"world"}` //! let _m = mock("POST", "/") //! .match_body( //! Matcher::AnyOf(vec![ //! Matcher::Exact("hello=world".to_string()), //! Matcher::JsonString("{\"hello\":\"world\"}".to_string()), //! ]) //! ) //! .create(); //!``` //! //! # Non-matching calls //! //! Any calls to the Mockito server that are not matched will return *501 Mock Not Found*. //! //! Note that **mocks are matched in reverse order** - the most recent one wins. //! //! # Cleaning up //! //! As mentioned earlier, mocks are cleaned up at the end of their normal Rust lifetime. However, //! you can always use the `reset` method to clean up *all* the mocks registered so far. //! //! ## Example //! //! ``` //! use mockito::{mock, reset}; //! //! let _m1 = mock("GET", "/1").create(); //! let _m2 = mock("GET", "/2").create(); //! let _m3 = mock("GET", "/3").create(); //! //! reset(); //! //! // Nothing is mocked at this point //! ``` //! //! Or you can use `std::mem::drop` to remove a single mock without having to wait for its scope to end: //! //! ## Example //! //! ``` //! use mockito::mock; //! use std::mem; //! //! let m = mock("GET", "/hello").create(); //! //! // Requests to GET /hello are mocked //! //! mem::drop(m); //! //! // Still in the scope of `m`, but requests to GET /hello aren't mocked any more //! ``` //! //! # Threads //! //! Mockito records all your mocks on the same server running in the background. For this //! reason, Mockito tests are run sequentially. This is handled internally via a thread-local //! mutex lock acquired **whenever you create a mock**. Tests that don't create mocks will //! still be run in parallel. //! extern crate httparse; extern crate rand; extern crate regex; #[macro_use] extern crate lazy_static; #[macro_use] extern crate log; extern crate serde_json; extern crate difference; extern crate colored; mod server; mod request; mod response; mod diff; type Request = request::Request; type Response = response::Response; use std::fs::File; use std::io::Read; use std::convert::{From, Into}; use std::ops::Drop; use std::fmt; use rand::distributions::Alphanumeric; use rand::{thread_rng, Rng}; use regex::Regex; use std::sync::{Mutex, LockResult, MutexGuard}; use std::cell::RefCell; lazy_static! { // A global lock that ensure all Mockito tests are run on a single thread. static ref TEST_MUTEX: Mutex<()> = Mutex::new(()); } thread_local!( // A thread-local reference to the global lock. This is acquired within `Mock#create()`. static LOCAL_TEST_MUTEX: RefCell<LockResult<MutexGuard<'static, ()>>> = RefCell::new(TEST_MUTEX.lock()); ); /// /// Points to the address the mock server is running at. /// Can be used with `std::net::TcpStream`. /// #[deprecated(note="Call server_address() instead")] pub const SERVER_ADDRESS: &str = SERVER_ADDRESS_INTERNAL; const SERVER_ADDRESS_INTERNAL: &str = "127.0.0.1:1234"; /// /// Points to the URL the mock server is running at. /// #[deprecated(note="Call server_url() instead")] pub const SERVER_URL: &str = "http://127.0.0.1:1234"; pub use server::address as server_address; pub use server::url as server_url; /// /// Initializes a mock for the provided `method` and `path`. /// /// The mock is registered to the server only after the `create()` method has been called. /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m1 = mock("GET", "/"); /// let _m2 = mock("POST", "/users"); /// let _m3 = mock("DELETE", "/users?id=1"); /// ``` /// pub fn mock<P: Into<Matcher>>(method: &str, path: P) -> Mock { Mock::new(method, path) } /// /// Removes all the mocks stored on the server. /// pub fn reset() { server::try_start(); let mut state = server::STATE.lock().unwrap(); state.mocks.clear(); } #[allow(missing_docs)] pub fn start() { server::try_start(); } /// /// Allows matching the request path or headers in multiple ways: matching the exact value, matching any value (as /// long as it is present), matching by regular expression or checking that a particular header is missing. /// /// These matchers are used within the `mock` and `Mock::match_header` calls. /// #[derive(Clone, PartialEq, Debug)] #[allow(deprecated)] // Rust bug #38832 pub enum Matcher { /// Matches the exact path or header value. There's also an implementation of `From<&str>` /// to keep things simple and backwards compatible. Exact(String), /// Matches a path or header value by a regular expression. Regex(String), /// Matches a specified JSON body from a `serde_json::Value` Json(serde_json::Value), /// Matches a specified JSON body from a `String` JsonString(String), /// At least one must match AnyOf(Vec<Matcher>), /// Matches any path or any header value. Any, /// Checks that a header is not present in the request. Missing, } impl<'a> From<&'a str> for Matcher { fn from(value: &str) -> Self { Matcher::Exact(value.to_string()) } } impl Matcher { fn matches_values(&self, header_values: &[&str]) -> bool { match self { Matcher::Missing => header_values.is_empty(), // AnyOf([…Missing…]) is handled here, but // AnyOf([Something]) is handled in the last block. // That's because Missing matches against all values at once, // but other matchers match against individual values. Matcher::AnyOf(ref matchers) if header_values.is_empty() => { matchers.iter().any(|m| m.matches_values(header_values)) }, _ => !header_values.is_empty() && header_values.iter().all(|val| self.matches_value(val)), } } #[allow(deprecated)] fn matches_value(&self, other: &str) -> bool { match self { Matcher::Exact(ref value) => { value == other }, Matcher::Regex(ref regex) => { Regex::new(regex).unwrap().is_match(other) }, Matcher::Json(ref json_obj) => { let other: serde_json::Value = serde_json::from_str(other).unwrap(); *json_obj == other }, Matcher::JsonString(ref value) => { let value: serde_json::Value = serde_json::from_str(value).unwrap(); let other: serde_json::Value = serde_json::from_str(other).unwrap(); value == other }, Matcher::Any => true, Matcher::AnyOf(ref matchers) => { matchers.iter().any(|m| m.matches_value(other)) }, Matcher::Missing => false, } } } /// /// Stores information about a mocked request. Should be initialized via `mockito::mock()`. /// #[derive(Clone, PartialEq, Debug)] pub struct Mock { id: String, method: String, path: Matcher, headers: Vec<(String, Matcher)>, body: Matcher, response: Response, hits: usize, expected_hits: usize, is_remote: bool, } impl Mock { fn new<P: Into<Matcher>>(method: &str, path: P) -> Self { Self { id: thread_rng().sample_iter(&Alphanumeric).take(24).collect(), method: method.to_owned().to_uppercase(), path: path.into(), headers: Vec::new(), body: Matcher::Any, response: Response::default(), hits: 0, expected_hits: 1, is_remote: false, } } /// /// Allows matching a particular request header when responding with a mock. /// /// When matching a request, the field letter case is ignored. /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m = mock("GET", "/").match_header("content-type", "application/json"); /// ``` /// /// Like most other `Mock` methods, it allows chanining: /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m = mock("GET", "/") /// .match_header("content-type", "application/json") /// .match_header("authorization", "password"); /// ``` /// pub fn match_header<M: Into<Matcher>>(mut self, field: &str, value: M) -> Self { self.headers.push((field.to_owned().to_lowercase(), value.into())); self } /// /// Allows matching a particular request body when responding with a mock. /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m1 = mock("POST", "/").match_body("{'hello':'world'}").with_body("json").create(); /// let _m2 = mock("POST", "/").match_body("hello=world").with_body("form").create(); /// /// // Requests passing "{'hello':'world'}" inside the body will be responded with "json". /// // Requests passing "hello=world" inside the body will be responded with "form". /// ``` /// pub fn match_body<M: Into<Matcher>>(mut self, body: M) -> Self { self.body = body.into(); self } /// /// Sets the status code of the mock response. The default status code is 200. /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m = mock("GET", "/").with_status(201); /// ``` /// pub fn with_status(mut self, status: usize) -> Self { self.response.status = status.into(); self } /// /// Sets a header of the mock response. /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m = mock("GET", "/").with_header("content-type", "application/json"); /// ``` /// pub fn with_header(mut self, field: &str, value: &str) -> Self { self.response.headers.push((field.to_owned(), value.to_owned())); self } /// /// Sets the body of the mock response. Its `Content-Length` is handled automatically. /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m = mock("GET", "/").with_body("hello world"); /// ``` /// pub fn with_body<StrOrBytes: AsRef<[u8]>>(mut self, body: StrOrBytes) -> Self { self.response.body = body.as_ref().to_owned(); self } /// /// Sets the body of the mock response from the contents of a file stored under `path`. /// Its `Content-Length` is handled automatically. /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m = mock("GET", "/").with_body_from_file("tests/files/simple.http"); /// ``` /// pub fn with_body_from_file(mut self, path: &str) -> Self { let mut file = File::open(path).unwrap(); let mut body = Vec::new(); file.read_to_end(&mut body).unwrap(); self.response.body = body; self } /// /// Sets the expected amount of requests that this mock is supposed to receive. /// This is only enforced when calling the `assert` method. /// Defaults to 1 request. /// pub fn expect(mut self, hits: usize) -> Self { self.expected_hits = hits; self } /// /// Asserts that the expected amount of requests (defaults to 1 request) were performed. /// pub fn assert(&self) { let mut opt_hits = None; let mut opt_message = None; { let state = server::STATE.lock().unwrap(); if let Some(remote_mock) = state.mocks.iter().find(|mock| mock.id == self.id) { opt_hits = Some(remote_mock.hits); let mut message = format!("\n> Expected {} request(s) to:\n{}\n...but received {}\n\n", self.expected_hits, self, remote_mock.hits); if let Some(last_request) = state.unmatched_requests.last() { message.push_str(&format!("> The last unmatched request was:\n{}\n", last_request)); let difference = diff::compare(&self.to_string(), &last_request.to_string()); message.push_str(&format!("> Difference:\n{}\n", difference)); } opt_message = Some(message); } } match (opt_hits, opt_message) { (Some(hits), Some(message)) => assert_eq!(self.expected_hits, hits, "{}", message), _ => panic!("Could not retrieve enough information about the remote mock."), } } /// /// Registers the mock to the server - your mock will be served only after calling this method. /// /// ## Example /// /// ``` /// use mockito::mock; /// /// let _m = mock("GET", "/").with_body("hello world").create(); /// ``` /// pub fn create(self) -> Self { server::try_start(); // Ensures Mockito tests are run sequentially. LOCAL_TEST_MUTEX.with(|_| {}); let mut state = server::STATE.lock().unwrap(); let mut remote_mock = self.clone(); remote_mock.is_remote = true; state.mocks.push(remote_mock); debug!("Mock::create() called for {}", self); self } fn is_local(&self) -> bool { !self.is_remote } } impl Drop for Mock { fn drop(&mut self) { if self.is_local() { let mut state = server::STATE.lock().unwrap(); if let Some(pos) = state.mocks.iter().position(|mock| mock.id == self.id) { state.mocks.remove(pos); } debug!("Mock::drop() called for {}", self); } } } impl fmt::Display for Mock { #[allow(deprecated)] fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { let mut formatted = String::new(); formatted.push_str("\r\n"); formatted.push_str(&self.method); formatted.push_str(" "); match self.path { Matcher::Exact(ref value) => { formatted.push_str(value); formatted.push_str("\r\n"); }, Matcher::Regex(ref value) => { formatted.push_str(value); formatted.push_str(" (regex)\r\n") }, Matcher::Json(ref json_obj) => { formatted.push_str(&json_obj.to_string()); formatted.push_str(" (json)\r\n") }, Matcher::JsonString(ref value) => { formatted.push_str(value); formatted.push_str(" (json)\r\n") }, Matcher::Any => formatted.push_str("(any)\r\n"), Matcher::AnyOf(..) => formatted.push_str("(any of)\r\n"), Matcher::Missing => formatted.push_str("(missing)\r\n"), } for &(ref key, ref value) in &self.headers { match value { Matcher::Exact(ref value) => { formatted.push_str(key); formatted.push_str(": "); formatted.push_str(value); }, Matcher::Regex(ref value) => { formatted.push_str(key); formatted.push_str(": "); formatted.push_str(value); formatted.push_str(" (regex)") }, Matcher::Json(ref json_obj) => { formatted.push_str(key); formatted.push_str(": "); formatted.push_str(&json_obj.to_string()); formatted.push_str(" (json)") }, Matcher::JsonString(ref value) => { formatted.push_str(key); formatted.push_str(": "); formatted.push_str(value); formatted.push_str(" (json)") }, Matcher::Any => { formatted.push_str(key); formatted.push_str(": "); formatted.push_str("(any)"); }, Matcher::Missing => { formatted.push_str(key); formatted.push_str(": "); formatted.push_str("(missing)"); }, Matcher::AnyOf(..) => { formatted.push_str(key); formatted.push_str(": "); formatted.push_str("(any of)"); }, } formatted.push_str("\r\n"); } match self.body { Matcher::Exact(ref value) | Matcher::JsonString(ref value) | Matcher::Regex(ref value) => { formatted.push_str(value); formatted.push_str("\r\n"); }, Matcher::Json(ref json_obj) => { formatted.push_str(&json_obj.to_string()); formatted.push_str("\r\n") }, Matcher::Missing => formatted.push_str("(missing)\r\n"), Matcher::AnyOf(..) => formatted.push_str("(any of)\r\n"), Matcher::Any => {} } f.write_str(&formatted) } }