5 unstable releases
Uses old Rust 2015
0.2.0 | Aug 26, 2018 |
---|---|
0.1.0 | Feb 4, 2018 |
0.0.3 | Apr 2, 2017 |
0.0.2 | Mar 25, 2017 |
0.0.1 | Mar 24, 2017 |
#557 in Testing
656 downloads per month
Used in 4 crates
16KB
126 lines
Pseudo
A small mocking library for Rust.
Pseudo lets you mock Trait
implementations so that you can track function call arguments and set return values or overrides functions at test time.
Here's a quick example:
extern crate pseudo;
use pseudo::Mock;
trait Foo: Clone {
fn expensive_fn(&self, x: i64, y: i64) -> i64;
}
#[derive(Clone)]
struct MockFoo {
pub expensive_fn: Mock<(i64, i64), i64>,
}
impl Foo for MockFoo {
fn expensive_fn(&self, x: i64, y: i64) -> i64 {
self.expensive_fn.call((x + 10, y))
}
}
fn double_expensive_fn<T: Foo>(foo: &T, x: i64, y: i64) -> i64 {
foo.expensive_fn(x, y) * 2
}
#[test]
fn doubles_return_value() {
let mock = MockFoo { expensive_fn: Mock::default() };
mock.expensive_fn.return_value(1000);
assert_eq!(double_expensive_fn(&mock, 1, 2), 2000);
}
#[test]
fn uses_correct_args() {
let mock = MockFoo { expensive_fn: Mock::default() };
assert!(!mock.expensive_fn.called());
double_expensive_fn(&mock, 1, 2);
assert_eq!(mock.expensive_fn.num_calls(), 1);
assert!(mock.expensive_fn.called_with((11, 2)));
}
More examples are available in the examples directory.