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feat(net): cleaner mock.on syntax
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This commit is contained in:
Paul Campbell 2024-11-10 17:11:54 +00:00
parent aad02be6cb
commit dc74920dc8
5 changed files with 248 additions and 86 deletions
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7
examples/get.rs
View file

@ -114,14 +114,13 @@ mod tests {
let url = "http://localhost:8080";
// declare what response should be made for a given request
let response: http::Response<&str> =
mock_net.response().body("contents").expect("response body");
let request = mock_net.client().get(url).build().expect("request");
let response = mock_net.response().body("contents");
let request = mock_net.client().get(url);
mock_net
.on(request)
// By default, the METHOD and URL must match, equivalent to:
//.match_on(vec![MatchOn::Method, MatchOn::Url])
.respond(response)
.respond_with_body(response)
.expect("mock");
// Create a temporary directory that will be deleted with `fs` goes out of scope

6
justfile
View file

@ -10,6 +10,12 @@ build:
cargo test --example get
cargo mutants --jobs 4
doc-test:
cargo doc
cargo test
cargo test --example get
install-hooks:
@echo "Installing git hooks"
git config core.hooksPath .git-hooks

150
src/net/mod.rs
View file

@ -1,13 +1,161 @@
//! Provides a generic interface for network operations.
//!
//!
//! Provides a testable interface over the [reqwest] crate.
//!
//! ## Overview
//!
//! The `net` module provides a testable interface for network operations.
//! It includes implementations for both real network interactions and mocked network operations for testing purposes.
//!
//! ## Key methods and types:
//!
//! - [kxio::net::new()][new()]: Creates a new `Net` instance
//! - [kxio::net::mock()][mock()]: Creates a new `MockNet` instance for use in tests
//! - [Error]: enum for network-related errors
//! - [Result]: an alias for `core::result::Result<T, Error>`
//! - [Net]: struct for real and mocked network operations
//! - [MockNet]: struct for defining behaviours of mocked network operations
//!
//! ## Usage
//!
//! Write your program to take a reference to [Net].
//!
//! Use the [Net::client] functionto create a [reqwest::RequestBuilder] which you should then pass to the [Net::send] method.
//! This is rather than building the request and calling its own `send` method, doing so would result in the network request being sent, even under-test.
//!
//! ```rust
//! use kxio::net;
//! async fn get_example(net: &net::Net) -> net::Result<()> {
//! let response = net.send(net.client().get("https://example.com")).await?;
//! ///...
//! Ok(())
//! }
//! ```
//!
//! ### Real Network Operations
//!
//! In your production code you will want to make real network requests.
//!
//! Construct a [Net] using [kxio::net::new()][new()]. Then pass as a reference to your program.
//!
//! ```rust
//! use kxio::net;
//! # #[tokio::main]
//! # async fn main() -> net::Result<()> {
//! let net = net::new();
//!
//! get_example(&net).await?;
//! # Ok(())
//! # }
//! # async fn get_example(net: &net::Net) -> net::Result<()> {Ok(())}
//! ```
//!
//! ### Mocked Network Operations
//!
//! In your tests you will want to mock your network requests and responses.
//!
//! Construct a [MockNet] using [kxio::net::mock()][mock()].
//!
//! ```rust
//! use kxio::net;
//! let mock_net = net::mock();
//! ```
//!
//! Create a [reqwest::Client] using [MockNet::client()].
//!
//! ```rust
//! # let mock_net = kxio::net::mock();
//! let client = mock_net.client();
//! // this is the same as:
//! let client = reqwest::Client::new();
//! ```
//!
//! Define the expected responses for each request, using the [MockNet::on],
//! that you expect you program to make during the test. You can choose what each request should be
//! matched against. The default is to the match when both the Method and Url are the same.
//!
//! ```rust
//! use kxio::net;
//! use kxio::net::MatchOn;
//!
//! # #[tokio::main]
//! # async fn main() -> net::Result<()> {
//! # let mock_net = net::mock();
//! # let client = mock_net.client();
//! mock_net.on(client.get("https://example.com"))
//! .match_on(vec![
//! MatchOn::Url,
//! MatchOn::Method
//! ])
//! .respond(mock_net.response().status(200))?;
//! mock_net.on(client.get("https://example.com/foo"))
//! .match_on(vec![
//! MatchOn::Url,
//! MatchOn::Method
//! ])
//! .respond_with_body(mock_net.response().status(500).body("Mocked response"))?;
//! # mock_net.reset();
//! # Ok(())
//! # }
//! ```
//!
//! All [MatchOn] options:
//! - [MatchOn::Method] (default)
//! - [MatchOn::Url] (default)
//! - [MatchOn::Headers]
//! - [MatchOn::Body].
//!
//! Once you have defined all your expected responses, convert the [MockNet] into a [Net].
//!
//! ```rust
//! # use kxio::net;
//! # let mock_net = net::mock();
//! let net: net::Net = mock_net.into();
//! // or
//! # let mock_net = net::mock();
//! let net = net::Net::from(mock_net);
//! ```
//!
//! Now you can pass a reference to `net` to your program.
//!
//! ```rust
//! # use kxio::net;
//! # #[tokio::main]
//! # async fn main() -> net::Result<()> {
//! # let mock_net = net::mock();
//! # let net = net::Net::from(mock_net);
//! get_example(&net).await?;
//! # Ok(())
//! # }
//! # async fn get_example(net: &net::Net) -> net::Result<()> {Ok(())}
//! ```
//!
//! When your test is finished, the [MockNet] will check that all the expected requests were
//! actually made. If there were any missed, then the test will [panic].
//!
//! If you don't want this to happen, then call [MockNet::reset] before your test finishes.
//! You will need to recover the [MockNet] from the [Net].
//!
//! ```rust
//! # use kxio::net;
//! # let mock_net = net::mock();
//! # let net = net::Net::from(mock_net);
//! let mock_net = kxio::net::MockNet::try_from(net).expect("recover mock");
//! mock_net.reset();
//! ````
//!
//! ## Error Handling
//!
//! The module uses a custom [Result] type that wraps `core::result::Result` with the custom [Error] enum,
//! allowing for specific error handling related to network operations.
mod result;
mod system;
pub use result::{Error, Result};
pub use system::{MatchOn, MockNet, Net};
pub use system::{MatchOn, MockNet, Net, OnRequest};
/// Creates a new `Net`.
pub const fn new() -> Net {

72
src/net/system.rs
View file

@ -32,6 +32,7 @@ struct Plan {
match_on: Vec<MatchOn>,
}
/// An abstraction for the network
#[derive(Debug)]
pub struct Net {
inner: InnerNet<Unmocked>,
@ -68,6 +69,14 @@ impl Net {
}
}
}
impl Default for Net {
fn default() -> Self {
Self {
inner: InnerNet::<Unmocked>::new(),
mock: None,
}
}
}
impl TryFrom<Net> for MockNet {
type Error = super::Error;
@ -87,7 +96,7 @@ impl MockNet {
pub fn client(&self) -> Client {
Default::default()
}
pub fn on(&self, request: impl Into<reqwest::Request>) -> OnRequest {
pub fn on(&self, request: impl Into<reqwest::RequestBuilder>) -> OnRequest {
self.inner.on(request)
}
/// Creates a [http::response::Builder] to be extended and returned by a mocked network request.
@ -190,11 +199,14 @@ impl InnerNet<Mocked> {
}
}
pub fn on(&self, request: impl Into<reqwest::Request>) -> OnRequest {
OnRequest {
pub fn on(&self, request_builder: impl Into<reqwest::RequestBuilder>) -> OnRequest {
match request_builder.into().build() {
Ok(request) => OnRequest::Valid {
net: self,
request: request.into(),
request,
match_on: vec![MatchOn::Method, MatchOn::Url],
},
Err(err) => OnRequest::Error(err.into()),
}
}
@ -228,20 +240,58 @@ impl<T: NetType> Drop for InnerNet<T> {
}
}
pub struct OnRequest<'net> {
pub enum OnRequest<'net> {
Valid {
net: &'net InnerNet<Mocked>,
request: reqwest::Request,
match_on: Vec<MatchOn>,
},
Error(super::Error),
}
impl<'net> OnRequest<'net> {
pub fn match_on(self, match_on: Vec<MatchOn>) -> Self {
Self {
net: self.net,
request: self.request,
if let OnRequest::Valid {
net,
request,
match_on: _,
} = self
{
Self::Valid {
net,
request,
match_on,
}
}
pub fn respond(self, response: impl Into<reqwest::Response>) -> Result<()> {
self.net._on(self.request, response.into(), self.match_on)
} else {
self
}
}
pub fn respond(self, response: impl Into<http::response::Builder>) -> Result<()> {
match self {
OnRequest::Valid {
net: _,
request: _,
match_on: _,
} => self.respond_with_body(response.into().body("")),
OnRequest::Error(error) => Err(error),
}
}
pub fn respond_with_body<T>(
self,
body_result: std::result::Result<http::Response<T>, http::Error>,
) -> Result<()>
where
T: Into<reqwest::Body>,
{
match body_result {
Ok(response) => match self {
OnRequest::Valid {
net,
request,
match_on,
} => net._on(request, response.into(), match_on),
OnRequest::Error(error) => Err(error),
},
Err(err) => Err(err.into()),
}
}
}

89
tests/net.rs
View file

@ -9,15 +9,11 @@ async fn test_get_url() {
let client = net.client();
let url = "https://www.example.com";
let request = client.get(url).build().expect("build request");
let my_response = net
.response()
.status(200)
.body("Get OK")
.expect("request body");
let request = client.get(url);
let my_response = net.response().status(200).body("Get OK");
net.on(request)
.respond(my_response)
.respond_with_body(my_response)
.expect("on request, respond");
//when
@ -38,15 +34,11 @@ async fn test_get_wrong_url() {
let client = net.client();
let url = "https://www.example.com";
let request = client.get(url).build().expect("build request");
let my_response = net
.response()
.status(200)
.body("Get OK")
.expect("request body");
let request = client.get(url);
let my_response = net.response().status(200).body("Get OK");
net.on(request)
.respond(my_response)
.respond_with_body(my_response)
.expect("on request, respond");
//when
@ -69,15 +61,11 @@ async fn test_post_url() {
let client = net.client();
let url = "https://www.example.com";
let request = client.post(url).build().expect("build request");
let my_response = net
.response()
.status(200)
.body("Post OK")
.expect("request body");
let request = client.post(url);
let my_response = net.response().status(200).body("Post OK");
net.on(request)
.respond(my_response)
.respond_with_body(my_response)
.expect("on request, respond");
//when
@ -98,12 +86,8 @@ async fn test_post_by_method() {
let client = net.client();
let url = "https://www.example.com";
let request = client.post(url).build().expect("build request");
let my_response = net
.response()
.status(200)
.body("Post OK")
.expect("request body");
let request = client.post(url);
let my_response = net.response().status(200);
net.on(request)
.match_on(vec![
@ -122,7 +106,7 @@ async fn test_post_by_method() {
//then
assert_eq!(response.status(), http::StatusCode::OK);
assert_eq!(response.bytes().await.expect("response body"), "Post OK");
assert_eq!(response.bytes().await.expect("response body"), "");
}
#[tokio::test]
@ -132,19 +116,15 @@ async fn test_post_by_url() {
let client = net.client();
let url = "https://www.example.com";
let request = client.post(url).build().expect("build request");
let my_response = net
.response()
.status(200)
.body("Post OK")
.expect("request body");
let request = client.post(url);
let my_response = net.response().status(200).body("Post OK");
net.on(request)
.match_on(vec![
// MatchOn::Method,
MatchOn::Url,
])
.respond(my_response)
.respond_with_body(my_response)
.expect("on request, respond");
//when
@ -166,16 +146,8 @@ async fn test_post_by_body() {
let client = net.client();
let url = "https://www.example.com";
let request = client
.post(url)
.body("match on body")
.build()
.expect("build request");
let my_response = net
.response()
.status(200)
.body("response body")
.expect("request body");
let request = client.post(url).body("match on body");
let my_response = net.response().status(200).body("response body");
net.on(request)
.match_on(vec![
@ -183,7 +155,7 @@ async fn test_post_by_body() {
// MatchOn::Url
MatchOn::Body,
])
.respond(my_response)
.respond_with_body(my_response)
.expect("on request, respond");
//when
@ -208,17 +180,8 @@ async fn test_post_by_headers() {
let client = net.client();
let url = "https://www.example.com";
let request = client
.post(url)
.body("foo")
.header("test", "match")
.build()
.expect("build request");
let my_response = net
.response()
.status(200)
.body("response body")
.expect("request body");
let request = client.post(url).body("foo").header("test", "match");
let my_response = net.response().status(200).body("response body");
net.on(request)
.match_on(vec![
@ -226,7 +189,7 @@ async fn test_post_by_headers() {
// MatchOn::Url
MatchOn::Headers,
])
.respond(my_response)
.respond_with_body(my_response)
.expect("on request, respond");
//when
@ -257,15 +220,11 @@ async fn test_unused_post() {
let client = net.client();
let url = "https://www.example.com";
let request = client.post(url).build().expect("build request");
let my_response = net
.response()
.status(200)
.body("Post OK")
.expect("request body");
let request = client.post(url);
let my_response = net.response().status(200).body("Post OK");
net.on(request)
.respond(my_response)
.respond_with_body(my_response)
.expect("on request, respond");
//when