Add tag filters to spack test list (#26842)

lib/spack/spack/cmd/test.py

@@ -89,6 +89,12 @@ def setup_parser(subparser):
         "-a", "--all", action="store_true", dest="list_all",
         help="list all packages with tests (not just installed)")
 
+    list_parser.add_argument(
+        'tag',
+        nargs='*',
+        help="limit packages to those with all listed tags"
+    )
+
     # Find
     find_parser = sp.add_parser('find', description=test_find.__doc__,
                                 help=first_line(test_find.__doc__))
@@ -214,15 +220,25 @@ def has_test_method(pkg):
 
 def test_list(args):
     """List installed packages with available tests."""
+    tagged = set(spack.repo.path.packages_with_tags(*args.tag)) if args.tag \
+        else set()
+
+    def has_test_and_tags(pkg_class):
+        return has_test_method(pkg_class) and \
+            (not args.tag or pkg_class.name in tagged)
+
     if args.list_all:
-        all_packages_with_tests = [
+        report_packages = [
             pkg_class.name
             for pkg_class in spack.repo.path.all_package_classes()
-            if has_test_method(pkg_class)
+            if has_test_and_tags(pkg_class)
         ]
+
         if sys.stdout.isatty():
-            tty.msg("%d packages with tests." % len(all_packages_with_tests))
-        colify.colify(all_packages_with_tests)
+            filtered = ' tagged' if args.tag else ''
+            tty.msg("{0}{1} packages with tests.".
+                    format(len(report_packages), filtered))
+        colify.colify(report_packages)
         return
 
     # TODO: This can be extended to have all of the output formatting options
@@ -231,7 +247,7 @@ def test_list(args):
     hashes = env.all_hashes() if env else None
 
     specs = spack.store.db.query(hashes=hashes)
-    specs = list(filter(lambda s: has_test_method(s.package_class), specs))
+    specs = list(filter(lambda s: has_test_and_tags(s.package_class), specs))
 
     spack.cmd.display_specs(specs, long=True)