Github user mxmrlv commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/207#discussion_r150822924
--- Diff: tests/mechanisms/utils.py ---
@@ -0,0 +1,71 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import itertools
+
+
+def matrix(*iterables, **kwargs):
+ """
+ Generates a matrix of parameters for ``@pytest.mark.parametrize``.
+
+ The matrix is essentially the Cartesian product of the arguments
(which should be iterables),
+ with the added ability to "flatten" each value by breaking up tuples
and recombining them into a
+ final flat value.
+
+ To do such recombination, use the ``counts`` argument (tuple) to
specify the number of elements
+ per value in order. Any count greater than 1 (the default) enables
recombination of that value.
+
+ Example::
+
+ x = ('hello', 'goodbye')
+ y = ('Linus', 'Richard')
+ matrix(x, y) ->
+ ('hello', 'Linus'),
+ ('hello', 'Richard'),
+ ('goodbye', 'Linus'),
+ ('goodbye', 'Richard')
+
+ y = (('Linus', 'Torvalds'), ('Richard', 'Stallman'))
+ matrix(x, y) ->
+ ('hello', ('Linus', 'Torvalds')),
+ ('hello', ('Richard', 'Stallman')),
+ ('goodbye', ('Linus', 'Torvalds')),
+ ('goodbye', ('Richard', 'Stallman'))
+
+ matrix(x, y, counts=(1, 2)) ->
+ ('hello', 'Linus', 'Torvalds'),
+ ('hello', 'Richard', 'Stallman'),
+ ('goodbye', 'Linus', 'Torvalds'),
+ ('goodbye', 'Richard', 'Stallman')
+ """
--- End diff --
still don't quite get how to use `counts`
---
