Similar to trybuild, but allows you to test how declarative or procedural macros are expanded.

Minimal Supported Rust Version: 1.56

Please refer to the documentation.

Install cargo expand.

Add to your crate's Cargo.toml:

[dev-dependencies]
macrotest = "1"

Under your crate's tests/ directory, create tests.rs file containing the following code:

#[test]
pub fn pass() {
    macrotest::expand("tests/expand/*.rs");
}

Populate the tests/expand/ directory with rust source files. Each source file is a macro expansion test case.

See test-project and test-procmacro-project for the reference.