feat: add testing macros and unit tests for linters

Add `assert_detected!` and `assert_not_detected!` macros to simplify
writing lint tests, along with initial test coverage for the
unnecessary render result creation linter.

1 files changed, 18 insertions, 0 deletions

diff --git a/mingling_cli/src/lints.rs b/mingling_cli/src/lints.rs
index 5bed483..8fab924 100644
--- a/mingling_cli/src/lints.rs
+++ b/mingling_cli/src/lints.rs
@@ -58,4 +58,22 @@ pub fn run_all_lints(file: &syn::File, source: &str) -> Vec<MlintReport> {
     // Remove allowed reports (sentinel = Help)
     reports.retain(|r| r.level != MlintLevel::Help);
     reports
+}
+
+#[macro_export]
+macro_rules! assert_detected {
+    ($linter:expr, $ast_type:ty => $code:tt) => {
+        // Parse the string into a syn::ItemFn
+        let ast: $ast_type = syn::parse_str(&stringify!($code)).unwrap();
+        assert!(!$linter(ast, &stringify!($code).to_string()).is_empty());
+    };
+}
+
+#[macro_export]
+macro_rules! assert_not_detected {
+    ($linter:expr, $ast_type:ty => $code:tt) => {
+        // Parse the string into a syn::ItemFn
+        let ast: $ast_type = syn::parse_str(&stringify!($code)).unwrap();
+        assert!($linter(ast, &stringify!($code).to_string()).is_empty());
+    };
 }
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