Support unit tests for jsondoclint

src/bootstrap/builder.rs

@@ -644,6 +644,7 @@ impl<'a> Builder<'a> {
                 test::CrateLibrustc,
                 test::CrateRustdoc,
                 test::CrateRustdocJsonTypes,
+                test::CrateJsonDocLint,
                 test::Linkcheck,
                 test::TierCheck,
                 test::ReplacePlaceholderTest,

src/bootstrap/test.rs

@@ -90,6 +90,42 @@ fn try_run_quiet(builder: &Builder<'_>, cmd: &mut Command) -> bool {
     true
 }
 
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub struct CrateJsonDocLint {
+    host: TargetSelection,
+}
+
+impl Step for CrateJsonDocLint {
+    type Output = ();
+    const ONLY_HOSTS: bool = true;
+    const DEFAULT: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.path("src/tools/jsondoclint")
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        run.builder.ensure(CrateJsonDocLint { host: run.target });
+    }
+
+    fn run(self, builder: &Builder<'_>) {
+        let bootstrap_host = builder.config.build;
+        let compiler = builder.compiler(0, bootstrap_host);
+
+        let cargo = tool::prepare_tool_cargo(
+            builder,
+            compiler,
+            Mode::ToolBootstrap,
+            bootstrap_host,
+            "test",
+            "src/tools/jsondoclint",
+            SourceType::InTree,
+            &[],
+        );
+        try_run(builder, &mut cargo.into());
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Linkcheck {
     host: TargetSelection,

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),
@@ -72,3 +72,6 @@ fn find_selector_recursive(
         }
     }
 }
+
+#[cfg(test)]
+mod tests;

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

@@ -0,0 +1,27 @@
+use super::*;
+
+#[test]
+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),