dyntest

A small Rust library for dynamically creating test cases.

Usage

# Cargo.toml
[[test]]
name = "test_name"
harness = false

// tests/test_name.rs

use dyntest::{dyntest, DynTester};

dyntest!(test);

fn test(t: &mut DynTester) {
  for (str, len) in [("a", 1), ("pq", 2), ("xyz", 3)] {
    t.test(str, move || {
      assert_eq!(str.len(), len);
    });
  }
}

running 3 tests
test a ... ok
test pq ... ok
test xyz ... ok

test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

Features

Test Grouping

Using DynTester::group, multiple related tests can be given a shared prefix, akin to a mod for static tests:

use dyntest::{dyntest, DynTester};

dyntest!(test);

fn test(t: &mut DynTester) {
  panic!("hi");
  t.group("foo", |t| {
    t.group("bar", |t| {
      t.test("baz", || {});
    });
    t.test("qux", || {});
  });
}

running 2 tests
test foo::bar::baz ... ok
test foo::qux ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

Globbing

When the glob feature is enabled (which it is by default), DynTester exposes glob and glob_in methods, which facilitate generating tests from files in a directory:

use dyntest::{dyntest, DynTester};

dyntest!(test);

fn test(t: &mut DynTester) {
  for (name, path) in t.glob_in("my/test/files/", "**/*.ext") {
    t.test(name, move || {
      // ...
    });
  }
}

my/test/files/
  foo.ext
  bar.ext
  baz/
    qux.ext
    something.unrelated

running 3 tests
test foo ... ok
test bar ... ok
test baz::qux ... ok

test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

Limitations

Using dyntest requires a nightly compiler, as it uses the unstable test crate.

In any given test files, the tests must either be all static or all dynamic; if you use dyntest! in a file, any #[test] fns will be silently ignored by rustc (this is inherent to harness = false).

Multiple invocations of dyntest! in the same test file are not supported; either separate it into multiple test files, or merge the dyntest! invocations (the macro supports multiple arguments).