datatest-mini

Minimal proc macro for generating test functions from fixture files. A lightweight drop-in replacement for datatest-stable.

Usage

Add to your Cargo.toml:

[dev-dependencies]
datatest-mini = "0.1"

Create a test harness (e.g., tests/harness.rs):

use std::path::Path;

fn run_test(path: &Path, content: &str) -> Result<(), Box<dyn std::error::Error>> {
    // path: absolute path to the fixture file
    // content: file content embedded at compile time via include_str!
    Ok(())
}

datatest_mini::harness! {
    { test = run_test, root = "tests/fixtures", pattern = r"^[^/]+\.txt$" },
}

Each file matching the pattern generates a separate #[test] function, so you get individual pass/fail results per fixture.

Multiple test sets

datatest_mini::harness! {
    { test = test_parsing, root = "tests/parse_fixtures", pattern = r"\.txt$" },
    { test = test_codegen, root = "tests/codegen_fixtures", pattern = r"\.wado$" },
}

Async tests

async fn run_async_test(path: &Path, content: &str) -> Result<(), Box<dyn std::error::Error>> {
    Ok(())
}

datatest_mini::harness! {
    // Uses #[tokio::test] by default
    { test = run_async_test, root = "tests/fixtures", pattern = r"\.txt$", async },
    // Custom attribute
    { test = run_async_test, root = "tests/fixtures", pattern = r"\.txt$",
      async, attr = r#"tokio::test(flavor = "multi_thread")"# },
}

The attr parameter can also be used without async for sync tests with custom attributes:

datatest_mini::harness! {
    { test = run_test, root = "tests/fixtures", pattern = r"\.txt$", attr = "googletest::test" },
}

Parameters

Parameter	Description
test	Test function with signature fn(&Path, &str) -> Result<(), Box<dyn Error>>
root	Path to the fixture directory (relative to Cargo.toml)
pattern	Regex pattern matched against relative file paths
async	(optional) Generate async fn tests. Defaults to #[tokio::test]
attr	(optional) Custom test attribute (e.g., "tokio::test(flavor = \"multi_thread\")")

License

MIT