Testing: Summarize test results and add verbose output (#28700)

var/spack/repos/builtin.mock/packages/simple-standalone-test/package.py

@@ -0,0 +1,20 @@
+# Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class SimpleStandaloneTest(Package):
+    """This package has a simple stand-alone test features."""
+    homepage = "http://www.example.com/simple_test"
+    url      = "http://www.unit-test-should-replace-this-url/simple_test-1.0.tar.gz"
+
+    version('1.0', '0123456789abcdef0123456789abcdef')
+
+    def test(self):
+        msg = 'simple stand-alone test'
+        self.run_test('echo', [msg],
+                      expected=[msg],
+                      purpose='test: running {0}'.format(msg))