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 or give meaningful names to test cases plague! { for [ 'empty ("",) -> 0, ("foo",) -> 3, 'c_str ("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 pos#4 ... ok test pos#2 ... FAILED test pos#3 ... FAILED test pos#5 ... ok test pos'empty ... ok test pos'notfound ... ok test pos'unary ... FAILED test withoutplague ... FAILED

failures:

---- pos#2 stdout ---- thread 'pos#2' panicked at 'test failed: got None, expected Some(0)', examples/cmp.rs:15

---- pos#3 stdout ---- thread 'pos#3' panicked at 'test failed: got Some(2), expected Some(0)', examples/cmp.rs:15

---- pos'unary stdout ---- thread 'pos'unary' panicked at 'test failed: got None, expected Some(0)', examples/cmp.rs:15

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

failures: pos#2 pos#3 pos'unary without_plague

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