webbdays/datatest-stable

Data-driven tests on stable Rust

datatest-stable

datatest-stable is a very simple test harness intended to write data-driven tests, where individual test cases are specified as files and not as code. Given:

• a test my_test that accepts a path as input
• a directory to look for files in
• a pattern to match files on

datatest-stable will call the my_test function once per matching file in the directory.

datatest-stable works with cargo nextest, and is part of the nextest-rs organization on GitHub.

Usage

1. Configure the test target by setting harness = false in Cargo.toml:

[[test]]
name = "<test target name>"
harness = false

2. Call the datatest_stable::harness!(testfn, root, pattern) macro with the following parameters:

• testfn - The test function to be executed on each matching input. This function can be one of:
  • fn(&Path) -> datatest_stable::Result<()>
  • fn(&Utf8Path) -> datatest_stable::Result<()> (Utf8Path is part of the camino library, and is re-exported here for convenience.)
• root - The path to the root directory where the input files (fixtures) live. This path is relative to the root of the crate.
• pattern - the regex used to match against and select each file to be tested.

The three parameters can be repeated if you have multiple sets of data-driven tests to be run: datatest_stable::harness!(testfn1, root1, pattern1, testfn2, root2, pattern2)

Examples

This is an example test. Use it with harness = false.

use datatest_stable::Utf8Path;
use std::path::Path;

fn my_test(path: &Path) -> datatest_stable::Result<()> {
    // ... write test here

    Ok(())
}

fn my_test_utf8(path: &Utf8Path) -> datatest_stable::Result<()> {
    // ... write test here

    Ok(())
}

datatest_stable::harness!(
    my_test, "path/to/fixtures", r"^.*/*",
    my_test_utf8, "path/to/fixtures", r"^.*/*",
);

Minimum supported Rust version (MSRV)

The minimum supported Rust version is Rust 1.65. MSRV bumps may be accompanied by a minor version update; at any time, Rust versions from at least the last 6 months are supported.

See also

• datatest: the original inspiration for this crate, with a better UI and more features but targeting nightly Rust
• Data-driven testing

License

This project is available under the terms of either the Apache 2.0 license or the MIT license.