add fuzzing

Cargo.toml

@@ -31,6 +31,7 @@ debug = true
 
 [workspace.dependencies]
 jiter = { path = "crates/jiter", version = "0.5.0" }
+batson = { path = "crates/batson", version = "0.5.0" }
 pyo3 = { version = "0.22.0" }
 pyo3-build-config = { version = "0.22.0" }
 bencher = "0.1.5"

crates/fuzz/Cargo.toml

@@ -15,7 +15,8 @@ serde = "1.0.190"
 indexmap = "2.0.0"
 num-bigint = "0.4.4"
 num-traits = "0.2.17"
-jiter = {path = "../jiter"}
+jiter = {workspace = true}
+batson = {workspace = true}
 
 [[bin]]
 name = "compare_to_serde"
@@ -28,3 +29,9 @@ name = "compare_skip"
 path = "fuzz_targets/compare_skip.rs"
 test = false
 doc = false
+
+[[bin]]
+name = "batson_round_trip"
+path = "fuzz_targets/batson_round_trip.rs"
+test = false
+doc = false

crates/fuzz/fuzz_targets/batson_round_trip.rs

@@ -0,0 +1,24 @@
+#![no_main]
+
+use batson::{batson_to_json_string, encode_from_json};
+use jiter::JsonValue;
+
+use libfuzzer_sys::fuzz_target;
+
+fn round_trip(json: String) {
+    let Ok(jiter_value1) = JsonValue::parse(json.as_bytes(), false) else {
+        return;
+    };
+    let bytes1 = encode_from_json(&jiter_value1).unwrap();
+    let json1 = batson_to_json_string(&bytes1).unwrap();
+
+    let jiter_value2 = JsonValue::parse(json1.as_bytes(), false).unwrap();
+    let bytes2 = encode_from_json(&jiter_value2).unwrap();
+    let json2 = batson_to_json_string(&bytes2).unwrap();
+
+    assert_eq!(json1, json2);
+}
+
+fuzz_target!(|json: String| {
+    round_trip(json);
+});