fix: error message when github team name is missing from team config

src/ownership/codeowners_file_parser.rs

@@ -71,10 +71,10 @@ fn teams_by_github_team_name(team_file_glob: Vec<String>) -> HashMap<String, Tea
         match glob::glob(&glob) {
             Ok(paths) => {
                 for path in paths.filter_map(Result::ok) {
-                    let team = match Team::from_team_file_path(path) {
+                    let team = match Team::from_team_file_path(path.clone()) {
                         Ok(team) => team,
                         Err(e) => {
-                            eprintln!("Error parsing team file: {}", e);
+                            eprintln!("Error parsing team file: {e:?}, path: {}", path.display());
                             continue;
                         }
                     };

src/ownership/file_owner_resolver.rs

@@ -116,7 +116,7 @@ fn load_teams(project_root: &Path, team_file_globs: &[String]) -> std::result::R
             match Team::from_team_file_path(path.clone()) {
                 Ok(team) => teams.push(team),
                 Err(e) => {
-                    eprintln!("Error parsing team file: {}, path: {}", e, path.display());
+                    eprintln!("Error parsing team file: {e:?}, path: {}", path.display());
                     continue;
                 }
             }

tests/fixtures/missing_github_team/.github/CODEOWNERS

@@ -0,0 +1,10 @@
+# STOP! - DO NOT EDIT THIS FILE MANUALLY
+# This file was automatically generated by "bin/codeownership validate".
+#
+# CODEOWNERS is used for GitHub to suggest code/file owners to various GitHub
+# teams. This is useful when developers create Pull Requests since the
+# code/file owner is notified. Reference GitHub docs for more details:
+# https://help.github.com/en/articles/about-code-owners
+
+# Match all files to GoodTeam so for-file --from-codeowners hits the parser path
+* @GoodTeam

tests/fixtures/missing_github_team/config/code_ownership.yml

@@ -0,0 +1,10 @@
+owned_globs:
+  - "{gems}/**/*.{rb,tsx,erb}"
+team_file_glob:
+  - config/teams/**/*.yml
+unbuilt_gems_path: gems
+unowned_globs:
+vendored_gems:
+  path: "gems"
+cache_directory: tmp/cache/codeowners
+ignore_dirs: []

tests/fixtures/missing_github_team/config/teams/bad_team.yml

@@ -0,0 +1 @@
+name: MissingGithub

tests/fixtures/missing_github_team/config/teams/good.yml

@@ -0,0 +1,3 @@
+name: Good
+github:
+  team: '@GoodTeam'

tests/fixtures/missing_github_team/gems/pets/dog.rb

@@ -0,0 +1,5 @@
+# generated
+# next line should be ignored
+# @team Payments
+
+class Dog; end

tests/missing_github_team_test.rs

@@ -0,0 +1,23 @@
+use predicates::prelude::*;
+use std::error::Error;
+
+mod common;
+use common::OutputStream;
+use common::run_codeowners;
+
+// Exercise the code path that skips invalid team files and prints to stderr
+// (codeowners_file_parser::teams_by_github_team_name). Uses for-file
+// --from-codeowners so the project is not built and the parser globs team
+// files; the invalid bad_team.yml is skipped and an error is printed.
+// With the fix: stderr contains "Error parsing team file:" and "missing field `github`".
+// Without the fix (reverted): stderr only has generic "YAML serialization/deserialization failed".
+#[test]
+fn test_missing_github_team_in_team_file_is_reported_on_stderr() -> Result<(), Box<dyn Error>> {
+    run_codeowners(
+        "missing_github_team",
+        &["for-file", "--from-codeowners", "ruby/foo.rb"],
+        true, // command succeeds; invalid file is skipped
+        OutputStream::Stderr,
+        predicate::str::contains("Error parsing team file:").and(predicate::str::contains("missing field `github`")),
+    )
+}