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// Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: MIT OR Apache-2.0

#![forbid(unsafe_code)]

//! `datatest-stable` is a very simple test harness intended to write data-driven tests, where
//! individual test cases are specified as data 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.
//!
//! This meets some of the needs provided by the `datatest` crate when using a stable rust compiler
//! without using the `RUSTC_BOOTSTRAP` hack to use nightly features on the stable compiler.
//!
//! In order to setup data-driven tests for a particular test target you must do the following:
//!
//! 1. Configure the test target by setting the following in the `Cargo.toml`
//!
//! ```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 must have
//!   the type `fn(&Path) -> datatest_stable::Result<()>`
//! * `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 std::path::Path;
//!
//! fn my_test(path: &Path) -> datatest_stable::Result<()> {
//!     // ... write test here
//!
//!     Ok(())
//! }
//!
//! datatest_stable::harness!(my_test, "path/to/fixtures", r"^.*/*");
//! ```
//!
//! # See also
//!
//! * [`datatest`](https://crates.io/crates/datatest): the original inspiration for this crate,
//!   with a better UI and more features but targeting nightly Rust
//! * [Data-driven testing](https://en.wikipedia.org/wiki/Data-driven_testing)

#![warn(missing_docs)]

mod macros;
mod runner;
mod utils;

/// The result type for `datatest-stable` tests.
pub type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;

pub use self::runner::{runner, Requirements};