Added tests to all our spackages

packages/simpletraj/package.py

@@ -17,3 +17,9 @@ class Simpletraj(PythonPackage):
     depends_on('python@3.8:', type=('build', 'run'))
     depends_on('py-setuptools')
     depends_on('py-numpy')
+
+    # Test
+    @run_after('install')
+    @on_package_attributes(run_tests=True)
+    def check_install (self):
+        python("-c", 'import simpletraj')