Move test utils to their own file.

src/indexed_crate.rs

@@ -632,58 +632,13 @@ fn create_manually_inlined_builtin_traits(crate_: &Crate) -> HashMap<Id, Item> {
 
 #[cfg(test)]
 mod tests {
-    use std::fs::read_to_string;
-
-    use anyhow::Context;
-    use rustdoc_types::Crate;
-
-    #[derive(serde::Deserialize)]
-    struct RustdocFormatVersion {
-        format_version: u32,
-    }
-
-    fn detect_rustdoc_format_version(file_data: &str) -> anyhow::Result<u32> {
-        let version = serde_json::from_str::<RustdocFormatVersion>(file_data)
-            .with_context(|| "file does not appear to be a rustdoc JSON format".to_string())?;
-
-        Ok(version.format_version)
-    }
-
-    fn load_pregenerated_rustdoc(crate_name: &str) -> Crate {
-        let path = format!("./localdata/test_data/{crate_name}/rustdoc.json");
-        let content = read_to_string(&path)
-            .with_context(|| format!("Could not load {path} file, did you forget to run ./scripts/regenerate_test_rustdocs.sh ?"))
-            .expect("failed to load rustdoc");
-        serde_json::from_str(&content)
-            .with_context(|| {
-                let format_version = detect_rustdoc_format_version(&content);
-                match format_version {
-                    Ok(format_version) => {
-                        format!(
-                            "Failed to parse {path} file: it is rustdoc version {format_version} but expected {}. \
-                            Did you forget to run ./scripts/regenerate_test_rustdocs.sh ?",
-                            rustdoc_types::FORMAT_VERSION,
-                        )
-                    }
-                    Err(..) => {
-                        format!(
-                            "Failed to parse {path} file: it didn't seem to be valid rustdoc JSON. \
-                            Did you forget to run ./scripts/regenerate_test_rustdocs.sh ?"
-                        )
-                    }
-                }
-            }).expect("failed to parse rustdoc JSON")
-    }
-
     mod reexports {
         use std::collections::{BTreeMap, BTreeSet};
 
         use itertools::Itertools;
         use maplit::{btreemap, btreeset};
 
-        use crate::IndexedCrate;
-
-        use super::load_pregenerated_rustdoc;
+        use crate::{test_util::load_pregenerated_rustdoc, IndexedCrate};
 
         fn assert_exported_items_match(
             test_crate: &str,

src/lib.rs

@@ -2,6 +2,9 @@ mod adapter;
 mod attributes;
 mod indexed_crate;
 
+#[cfg(test)]
+pub(crate) mod test_util;
+
 // Re-export the Crate type so we can deserialize it.
 pub use rustdoc_types::Crate;
 

src/test_util.rs

@@ -0,0 +1,42 @@
+use std::fs::read_to_string;
+
+use anyhow::Context;
+use rustdoc_types::Crate;
+
+#[derive(serde::Deserialize)]
+struct RustdocFormatVersion {
+    format_version: u32,
+}
+
+pub(crate) fn detect_rustdoc_format_version(file_data: &str) -> anyhow::Result<u32> {
+    let version = serde_json::from_str::<RustdocFormatVersion>(file_data)
+        .with_context(|| "file does not appear to be a rustdoc JSON format".to_string())?;
+
+    Ok(version.format_version)
+}
+
+pub(crate) fn load_pregenerated_rustdoc(crate_name: &str) -> Crate {
+    let path = format!("./localdata/test_data/{crate_name}/rustdoc.json");
+    let content = read_to_string(&path)
+        .with_context(|| format!("Could not load {path} file, did you forget to run ./scripts/regenerate_test_rustdocs.sh ?"))
+        .expect("failed to load rustdoc");
+    serde_json::from_str(&content)
+        .with_context(|| {
+            let format_version = detect_rustdoc_format_version(&content);
+            match format_version {
+                Ok(format_version) => {
+                    format!(
+                        "Failed to parse {path} file: it is rustdoc version {format_version} but expected {}. \
+                        Did you forget to run ./scripts/regenerate_test_rustdocs.sh ?",
+                        rustdoc_types::FORMAT_VERSION,
+                    )
+                }
+                Err(..) => {
+                    format!(
+                        "Failed to parse {path} file: it didn't seem to be valid rustdoc JSON. \
+                        Did you forget to run ./scripts/regenerate_test_rustdocs.sh ?"
+                    )
+                }
+            }
+        }).expect("failed to parse rustdoc JSON")
+}