check if x test tests missing any test directory

src/bootstrap/src/core/builder.rs

@@ -317,11 +317,13 @@ const PATH_REMAP: &[(&str, &[&str])] = &[
     (
         "tests",
         &[
+            // tidy-alphabetical-start
             "tests/assembly",
             "tests/codegen",
             "tests/codegen-units",
             "tests/coverage",
             "tests/coverage-run-rustdoc",
+            "tests/crashes",
             "tests/debuginfo",
             "tests/incremental",
             "tests/mir-opt",
@@ -337,6 +339,7 @@ const PATH_REMAP: &[(&str, &[&str])] = &[
             "tests/rustdoc-ui",
             "tests/ui",
             "tests/ui-fulldeps",
+            // tidy-alphabetical-end
         ],
     ),
 ];

src/bootstrap/src/core/builder/tests.rs

@@ -128,6 +128,26 @@ fn validate_path_remap() {
         });
 }
 
+#[test]
+fn check_missing_paths_for_x_test_tests() {
+    let build = Build::new(configure("test", &["A-A"], &["A-A"]));
+
+    let (_, tests_remap_paths) =
+        PATH_REMAP.iter().find(|(target_path, _)| *target_path == "tests").unwrap();
+
+    let tests_dir = fs::read_dir(build.src.join("tests")).unwrap();
+    for dir in tests_dir {
+        let path = dir.unwrap().path();
+
+        // Skip if not a test directory.
+        if path.ends_with("tests/auxiliary") || !path.is_dir() {
+            continue
+        }
+
+        assert!(tests_remap_paths.iter().any(|item| path.ends_with(*item)), "{} is missing in PATH_REMAP tests list.", path.display());
+    }
+}
+
 #[test]
 fn test_exclude() {
     let mut config = configure("test", &["A-A"], &["A-A"]);