Plague

Parametrized tests tools for Rust

What

This rustc plugin adds a macro to help you make parametrized tests:

```rust // Basic usage plague! { for [ (1, 1), (2, 2), ] test fn eq(a: i32, b: i32) { assert_eq!(a, b); } }

// You can also specify the expected value, Plague will assert_eq! the result for you plague! { for [1 -> 2, 2 -> 4] test fn double(a: i32) -> i32 { 2*a } }

// And you can call functions defined somewhere else plague! { for [ ("",) -> 0, ("foo",) -> 3, ("foo\u{0}bar",) -> 7, ] test str::len } ```

Why

The plugin will generate one test function for each parameter set, this way, running cargo test will show each failed value, instead of just one: ``` running 8 tests test pos0 ... ok test pos2 ... FAILED test pos3 ... FAILED test pos1 ... FAILED test pos4 ... ok test pos5 ... ok test pos6 ... ok test withoutplague ... FAILED

failures:

---- pos2 stdout ---- thread 'pos2' panicked at 'assertion failed: (left == right) (left: Some(0), right: None)', examples/cmp.rs:15

---- pos3 stdout ---- thread 'pos3' panicked at 'assertion failed: (left == right) (left: Some(0), right: Some(2))', examples/cmp.rs:15

---- pos1 stdout ---- thread 'pos1' panicked at 'assertion failed: (left == right) (left: Some(0), right: None)', examples/cmp.rs:15

---- withoutplague stdout ---- thread 'withoutplague' panicked at 'assertion failed: (left == right) (left: None, right: Some(0))', examples/cmp.rs:41

failures: pos1 pos2 pos3 withoutplague

test result: FAILED. 4 passed; 4 failed; 0 ignored; 0 measured ```