feat: tests

Author: fzyzcjy

frb_codegen/src/library/codegen/generator/misc/comments.rs

@@ -9,3 +9,15 @@ pub(crate) fn generate_codec_comments(codec: CodecMode) -> String {
     };
     format!("// Codec={codec} ({brief_explanation}), see doc to use other codecs")
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_generate_codec_comments() {
+        assert_eq!(
+            &generate_codec_comments(CodecMode::Pde),
+            "// Codec=Pde (Serialization + dispatch), see doc to use other codecs",
+        );
+    }
+}

frb_codegen/src/library/codegen/generator/wire/dart/spec_generator/wire_class/io/via_manual.rs

@@ -72,8 +72,11 @@ fn generate_func(func: &ExternFunc, c_symbol_prefix: &str) -> String {
             "
         )
     } else {
+        // This will stop the whole generator and tell the users, so we do not care about testing it
+        // frb-coverage:ignore-start
         unreachable!(
             "Do not understand how to generate this func without ffigen yet (func={func:?})"
         )
+        // frb-coverage:ignore-end
     }
 }