fix(health): recognize Ruby <stem>_spec.rb test pairing

packages/core/src/repowise/core/analysis/health/engine.py

@@ -289,6 +289,7 @@ def _has_paired_test_file(rel_path: str, path_basenames: set[str]) -> bool:
     candidates = {
         f"test_{stem}.py",
         f"{stem}_test{test_suffix}",
+        f"{stem}_spec{test_suffix}",
         f"{stem}.test.ts",
         f"{stem}.test.tsx",
         f"{stem}.test.js",

tests/unit/health/test_paired_test_basenames.py

@@ -24,6 +24,7 @@ def _reference_has_paired_test_file(rel_path: str, all_paths: set[str]) -> bool:
     candidates = {
         f"test_{stem}.py",
         f"{stem}_test.py",
+        f"{stem}_spec.rb",
         f"{stem}.test.ts",
         f"{stem}.test.tsx",
         f"{stem}.test.js",
@@ -102,3 +103,12 @@ def test_basenames_split_on_forward_slash_only(self) -> None:
     def test_empty_paths(self) -> None:
         assert _path_basenames(set()) == set()
         assert not _has_paired_test_file("anything.py", set())
+
+    def test_ruby_and_crystal_underscore_spec_pairing(self) -> None:
+        """Ruby's <stem>_spec.rb (and Crystal's <stem>_spec.cr) is a paired test (#1768)."""
+        ruby = {"spec/user_spec.rb"}
+        assert _has_paired_test_file("lib/user.rb", _path_basenames(ruby))
+        crystal = {"spec/user_spec.cr"}
+        assert _has_paired_test_file("src/user.cr", _path_basenames(crystal))
+        # Same stem, dot form, must NOT count for Ruby's underscore layout.
+        assert not _has_paired_test_file("lib/user.rb", _path_basenames({"spec/user.spec.rb"}))

tests/unit/server/mcp/test_risk.py

@@ -236,6 +236,8 @@ def test_classify_bus_factor_unknown_team_size_keeps_behaviour():
         ("lib/user.dart", "test/user_test.dart"),
         ("lib/user.ex", "test/user_test.exs"),
         ("src/user.rs", "tests/user_test.rs"),
+        ("lib/user.rb", "spec/user_spec.rb"),
+        ("src/user.cr", "spec/user_spec.cr"),
     ],
 )
 def test_health_filename_heuristic_supports_suffix_test_conventions(source, test):