Add code to test the wasm code path without actually dropping into wasm.

src/wasm/parse_result.rs

@@ -3,7 +3,7 @@ use serde::Serialize;
 
 use super::document::WasmDocument;
 
-#[derive(Serialize, Deserialize)]
+#[derive(Debug, Serialize, Deserialize)]
 #[serde(tag = "status", content = "content")]
 pub(crate) enum ParseResult<'s> {
     #[serde(rename = "success")]