test(test2): Add test checking module structure

Note that the list of passing tests is 1, even though 2 tests have passed.
Probably because they both share the exact same test name: `foo`.

Author: skogseth

crates/libtest2/tests/testsuite/macros.rs

@@ -0,0 +1,46 @@
+use snapbox::str;
+
+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 foo(_context: &libtest2::TestContext) {}
+
+mod some_module {
+    #[libtest2::test]
+    fn foo(_context: &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 check() {
+    let data = str![[r#"
+
+running 2 tests
+test foo ... ok
+test foo ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 filtered out; finished in [..]s
+
+
+"#]];
+
+    test_cmd()
+        .args(["--test-threads", "1"])
+        .assert()
+        .success()
+        .stdout_eq(data);
+}

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;