Add a test that makes sense

src/tools/jsondoclint/src/json_find.rs

@@ -2,7 +2,7 @@ use std::fmt::Write;
 
 use serde_json::Value;
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub enum SelectorPart {
     Field(String),
     Index(usize),

src/tools/jsondoclint/src/json_find/tests.rs

@@ -1,4 +1,27 @@
+use super::*;
+
 #[test]
-fn should_fail() {
-    assert_eq!(true, false);
+fn basic_find() {
+    use SelectorPart::*;
+
+    let j = serde_json::json!({
+        "index": {
+            "4": {
+                "inner": {
+                    "items": ["1", "2", "3"]
+                }
+            }
+        }
+    });
+
+    let sel = find_selector(&j, &serde_json::json!("1"));
+    let exp: Vec<Vec<SelectorPart>> = vec![vec![
+        Field("index".to_owned()),
+        Field("4".to_owned()),
+        Field("inner".to_owned()),
+        Field("items".to_owned()),
+        Index(0),
+    ]];
+
+    assert_eq!(exp, sel);
 }

src/tools/jsondoclint/src/main.rs

@@ -9,13 +9,13 @@ pub(crate) mod item_kind;
 mod json_find;
 mod validator;
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 struct Error {
     kind: ErrorKind,
     id: Id,
 }
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
 enum ErrorKind {
     NotFound,
     Custom(String),