test(test2): Add test module for attribute macros

This module aims to specifically test that the macros accept various
edge cases that a user might expect us to support. This includes:
- No parameters
- Return result (with and without context as a parameter)
- Include context as a parameter, but ignore it
- Include context as a parameter and pattern match on it

Author: skogseth

crates/libtest2/tests/testsuite/macros.rs

@@ -0,0 +1,44 @@
+fn test_cmd() -> snapbox::cmd::Command {
+    static BIN: once_cell_polyfill::sync::OnceLock<(std::path::PathBuf, std::path::PathBuf)> =
+        once_cell_polyfill::sync::OnceLock::new();
+
+    let (bin, current_dir) = BIN.get_or_init(|| {
+        let package_root = crate::util::new_test(
+            r#"
+#[libtest2::main]
+fn main() {}
+
+#[libtest2::test]
+fn takes_context(_context: &libtest2::TestContext) {}
+
+#[libtest2::test]
+fn no_parameters() {}
+
+#[libtest2::test]
+fn takes_context_return_result(_context: &libtest2::TestContext) -> libtest2::RunResult {
+    Ok(())
+}
+
+#[libtest2::test]
+fn no_parameters_return_result() -> libtest2::RunResult {
+    Ok(())
+}
+
+#[libtest2::test]
+fn ignored_context(_: &libtest2::TestContext) {}
+
+#[libtest2::test]
+fn context_as_pattern(libtest2::TestContext { .. }: &libtest2::TestContext) {}
+"#,
+            false,
+        );
+        let bin = crate::util::compile_test(&package_root);
+        (bin, package_root)
+    });
+    snapbox::cmd::Command::new(bin).current_dir(current_dir)
+}
+
+#[test]
+fn all_pass() {
+    test_cmd().assert().code(0);
+}

crates/libtest2/tests/testsuite/main.rs

@@ -1,5 +1,6 @@
 mod all_passing;
 mod argfile;
+mod macros;
 mod mixed_bag;
 mod panic;
 mod should_panic;