This library provides macro that provides mock struct generating that implements trait.
[dependencies]
moq = "0.5"
#[moq::automock]
trait Trait {
fn func(&self, arg: i64) -> String;
}
#[test]
fn test_ok() {
let mock = MockTrait::new()
.expect_func(|arg: i64| {
assert_eq!(arg, 42);
format!("Hello, {}", arg)
})
.expect_func(|arg: i64| {
assert_eq!(arg, -1);
format!("Hello again, {}", -1)
});
mock.func(42);
mock.func(-1);
}
#[test]
#[should_panic]
fn test_failed_extra_call() {
let mock = MockTrait::new()
.expect_func(|arg: i64| {
assert_eq!(arg, 42);
format!("Hello, {}", arg)
});
mock.func(42);
mock.func(-1); // Panic here
}
#[test]
#[should_panic]
fn test_failed_missing_call() {
let mock = MockTrait::new()
.expect_func(|arg: i64| {
assert_eq!(arg, 42);
format!("Hello, {}", arg)
})
.expect_func(|arg: i64| {
assert_eq!(arg, -1);
format!("Hello again, {}", -1)
});
mock.func(42);
// Panic here
}
async_trait
also works, but the main limitation is to specify the automock
macro above the async_trait
#[moq::automock]
#[async_trait::async_trait]
trait Trait {
async fn func(&self, arg: i64) -> String;
}
#[tokio::test]
async fn test_ok() {
let mock = MockTrait::new()
.expect_func(|arg: i64| async {
assert_eq!(arg, 42);
format!("Hello, {}", arg)
});
mock.func(42).await;
}
You can find more examples in the tests.
- Supporting generic functions
- Supporting static functions
- Macro
moq::mock!(..)
for generating mock struct for external trait - Generating mock struct for struct without trait
- Capturing environment in
moq::lambda!
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.