use predicates::float::is_close; use ridicule::mock; use ridicule::predicate::function; trait Haha { type Hello; } trait Foo { fn bar(&self, num: u128) -> Baz::Hello; fn abc(&mut self, thing_a: ThingA, thing_b: ThingB); } mock! { MockFoo {} impl Foo for MockFoo { fn bar(&self, num: u128) -> Baz::Hello; fn abc(&mut self, thing_a: ThingA, thing_b: ThingB); } } impl Haha for u16 { type Hello = String; } impl Haha for &str { type Hello = u8; } fn main() { let mut mock_foo = MockFoo::new(); mock_foo .expect_bar::() .returning(|_me, num| { println!("bar was called with {num}"); "Hello".to_string() }) .times(3); mock_foo.expect_bar::<&str>().returning(|_me, num| { println!("bar was called with {num}"); 128u8 }); mock_foo .expect_abc::<&str, f64>() .with( function(|thing_a: &&str| thing_a.starts_with("Good morning")), is_close(7.13081), ) .returning(|_me, _thing_a, _thing_b| { println!("abc was called"); }) .times(1); assert_eq!(mock_foo.bar::(123), "Hello".to_string()); assert_eq!(mock_foo.bar::(123), "Hello".to_string()); assert_eq!(mock_foo.bar::(123), "Hello".to_string()); // Would panic // mock_foo.bar::(123); assert_eq!(mock_foo.bar::<&str>(456), 128); mock_foo.abc( concat!( "Good morning, and in case I don't see ya, good afternoon,", " good evening, and good night!" ), 7.13081f64, ); }