test: added snapshot tests for the serde feature

Added snapshot tests based on `insta` to both the rsonpath-syntax
and rsonpath-lib serialization features.

Ref: #624

Cargo.toml

@@ -33,6 +33,7 @@ log = "0.4.22"
 thiserror = "2.0.9"
 # Dev-dependencies
 ciborium = { version = "0.2.2", default-features = false }
+insta = { version = "1.41.1" }
 itertools = "0.13.0"
 pretty_assertions = "1.4.1"
 proptest = "1.5.0"

crates/rsonpath-lib/Cargo.toml

@@ -39,6 +39,7 @@ vector-map = "1.0.1"
 
 [dev-dependencies]
 ciborium = { workspace = true, default-features = true }
+insta = { workspace = true, features = ["ron"] }
 itertools = { workspace = true }
 pretty_assertions = { workspace = true }
 proptest = { workspace = true }

crates/rsonpath-lib/tests/engine_serialization_snapshots.rs

@@ -0,0 +1,43 @@
+use insta::assert_ron_snapshot;
+use rsonpath::engine::{Compiler, RsonpathEngine};
+
+mod ron {
+    use super::*;
+    use std::error::Error;
+
+    fn engine(string: &str) -> Result<RsonpathEngine, Box<dyn Error>> {
+        let query = rsonpath_syntax::parse(string)?;
+        let engine = RsonpathEngine::compile_query(&query)?;
+        Ok(engine)
+    }
+
+    #[test]
+    fn empty_query() -> Result<(), Box<dyn Error>> {
+        assert_ron_snapshot!(&engine("$")?);
+        Ok(())
+    }
+
+    #[test]
+    fn readme_query() -> Result<(), Box<dyn Error>> {
+        assert_ron_snapshot!(&engine("$.jsonpath[*]")?);
+        Ok(())
+    }
+
+    #[test]
+    fn jsonpath_example_query() -> Result<(), Box<dyn Error>> {
+        assert_ron_snapshot!(&engine("$..phoneNumbers[*].number")?);
+        Ok(())
+    }
+
+    #[test]
+    fn real_life_query() -> Result<(), Box<dyn Error>> {
+        assert_ron_snapshot!(&engine("$.personal.details.contact.information.phones.home")?);
+        Ok(())
+    }
+
+    #[test]
+    fn slice() -> Result<(), Box<dyn Error>> {
+        assert_ron_snapshot!(&engine("$..entries[3:5:7]")?);
+        Ok(())
+    }
+}

crates/rsonpath-lib/tests/snapshots/engine_serialization_snapshots__ron__empty_query.snap

@@ -0,0 +1,21 @@
+---
+source: crates/rsonpath-lib/tests/engine_serialization_snapshots.rs
+expression: "&engine(\"$\")?"
+snapshot_kind: text
+---
+(V1, Automaton(
+  states: [
+    StateTable(
+      attributes: StateAttributes(2),
+      member_transitions: [],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(1),
+      member_transitions: [],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+  ],
+))

crates/rsonpath-lib/tests/snapshots/engine_serialization_snapshots__ron__jsonpath_example_query.snap

@@ -0,0 +1,84 @@
+---
+source: crates/rsonpath-lib/tests/engine_serialization_snapshots.rs
+expression: "&engine(\"$..phoneNumbers[*].number\")?"
+snapshot_kind: text
+---
+(V1, Automaton(
+  states: [
+    StateTable(
+      attributes: StateAttributes(2),
+      member_transitions: [],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(0),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"phoneNumbers\"",
+        )), State(2)),
+      ],
+      array_transitions: [],
+      fallback_state: State(1),
+    ),
+    StateTable(
+      attributes: StateAttributes(0),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"phoneNumbers\"",
+        )), State(4)),
+      ],
+      array_transitions: [],
+      fallback_state: State(3),
+    ),
+    StateTable(
+      attributes: StateAttributes(8),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"phoneNumbers\"",
+        )), State(2)),
+        (StringPattern(JsonString(
+          quoted: "\"number\"",
+        )), State(6)),
+      ],
+      array_transitions: [],
+      fallback_state: State(1),
+    ),
+    StateTable(
+      attributes: StateAttributes(8),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"phoneNumbers\"",
+        )), State(4)),
+        (StringPattern(JsonString(
+          quoted: "\"number\"",
+        )), State(5)),
+      ],
+      array_transitions: [],
+      fallback_state: State(3),
+    ),
+    StateTable(
+      attributes: StateAttributes(9),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"phoneNumbers\"",
+        )), State(2)),
+        (StringPattern(JsonString(
+          quoted: "\"number\"",
+        )), State(6)),
+      ],
+      array_transitions: [],
+      fallback_state: State(1),
+    ),
+    StateTable(
+      attributes: StateAttributes(1),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"phoneNumbers\"",
+        )), State(2)),
+      ],
+      array_transitions: [],
+      fallback_state: State(1),
+    ),
+  ],
+))

crates/rsonpath-lib/tests/snapshots/engine_serialization_snapshots__ron__readme_query.snap

@@ -0,0 +1,37 @@
+---
+source: crates/rsonpath-lib/tests/engine_serialization_snapshots.rs
+expression: "&engine(\"$.jsonpath[*]\")?"
+snapshot_kind: text
+---
+(V1, Automaton(
+  states: [
+    StateTable(
+      attributes: StateAttributes(2),
+      member_transitions: [],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(4),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"jsonpath\"",
+        )), State(2)),
+      ],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(8),
+      member_transitions: [],
+      array_transitions: [],
+      fallback_state: State(3),
+    ),
+    StateTable(
+      attributes: StateAttributes(1),
+      member_transitions: [],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+  ],
+))

crates/rsonpath-lib/tests/snapshots/engine_serialization_snapshots__ron__real_life_query.snap

@@ -0,0 +1,81 @@
+---
+source: crates/rsonpath-lib/tests/engine_serialization_snapshots.rs
+expression: "&engine(\"$.personal.details.contact.information.phones.home\")?"
+snapshot_kind: text
+---
+(V1, Automaton(
+  states: [
+    StateTable(
+      attributes: StateAttributes(2),
+      member_transitions: [],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(4),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"personal\"",
+        )), State(2)),
+      ],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(4),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"details\"",
+        )), State(3)),
+      ],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(4),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"contact\"",
+        )), State(4)),
+      ],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(4),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"information\"",
+        )), State(5)),
+      ],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(4),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"phones\"",
+        )), State(6)),
+      ],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(12),
+      member_transitions: [
+        (StringPattern(JsonString(
+          quoted: "\"home\"",
+        )), State(7)),
+      ],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+    StateTable(
+      attributes: StateAttributes(1),
+      member_transitions: [],
+      array_transitions: [],
+      fallback_state: State(0),
+    ),
+  ],
+))