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Cargo.toml | ||
README.md |
README.md
Always-Equal
Always-Equal lets you wrap PartialEq
implementations around
things that cannot be compared, like a File
.
To use Always-Equal, put these two conditional use
statements in your module:
#[cfg (test)]
use always_equal::test::AlwaysEqual;
#[cfg (not (test))]
use always_equal::prod::AlwaysEqual;
Then wrap AlwaysEqual
around anything that needs
PartialEq but can't possibly implement it:
use std::fs::File;
use always_equal::test::AlwaysEqual;
#[derive (Debug, PartialEq)]
pub struct MyStruct {
pub b: bool,
pub i: i64,
pub file: AlwaysEqual <File>,
}
// In test code, you can create an empty wrapper using
// `testing_blank`, which is equal to any other wrapper:
let expected = MyStruct {
b: true,
i: 0,
file: AlwaysEqual::testing_blank (),
};
# let my_file = File::open ("Cargo.toml").unwrap ();
let actual = MyStruct {
b: true,
i: 0,
file: my_file.into (),
};
assert_eq! (expected, actual);
This is implemented with Option
in test mode.
In production mode, wrappers are never equal to any other
wrapper, and the Option
is removed so that
sizeof::<AlwaysEqual <T>> () == sizeof::<T>
should be true.