add a test to verify multiple PVC requests create multiple volumes

This is sort of a trial of the both the test framework, my ability
to add tests to it, and the workflow of adding changes to the repo.

Change-Id: I17b61f298c04f45df8b77555b16d292fd2b2a3a8
Signed-off-by: John Mulligan <jmulligan@redhat.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/cns-libs/cnslibs/common/naming.py b/cns-libs/cnslibs/common/naming.py
new file mode 100644
index 00000000..b44559ad
--- /dev/null
+++ b/cns-libs/cnslibs/common/naming.py
@@ -0,0 +1,56 @@
+"""Helper functions for working with names for volumes, resources, etc.
+"""
+
+import string
+import random
+import re
+
+# we only use lowercase here because kubernetes requires
+# names to be lowercase or digits, so that is our default
+UNIQUE_CHARS = (string.lowercase + string.digits)
+
+
+def make_unique_label(prefix=None, suffix=None, sep='-',
+                      clean=r'[^a-zA-Z0-9]+', unique_len=8,
+                      unique_chars=UNIQUE_CHARS):
+    """Generate a unique name string based on an optional prefix,
+    suffix, and pseudo-random set of alphanumeric characters.
+
+    Args:
+        prefix (str): Start of the unique string.
+        suffix (str): End of the unique string.
+        sep (str): Separator string (between sections/invalid chars).
+        clean (str): Reqular expression matching invalid chars.
+            that will be replaced by `sep` if found in the prefix or suffix
+        unique_len (int): Length of the unique part.
+        unique_chars (str): String representing the set of characters
+            the unique part will draw from.
+    Returns:
+        str: The uniqueish string.
+    """
+    cre = re.compile(clean)
+    parts = []
+    if prefix:
+        parts.append(cre.sub(sep, prefix))
+    parts.append(''.join(random.choice(unique_chars)
+                         for _ in range(unique_len)))
+    if suffix:
+        parts.append(cre.sub(sep, suffix))
+    return sep.join(parts)
+
+
+def extract_method_name(full_name, keep_class=False):
+    """Given a full test name as returned from TestCase.id() return
+    just the method part or class.method.
+
+    Args:
+        full_name (str): Dot separated name of test.
+        keep_class (str): Retain the class name, if false only the
+            method name will be returned.
+    Returns:
+        str: Method name or class.method_name.
+    """
+    offset = -1
+    if keep_class:
+        offset = -2
+    return '.'.join(full_name.split('.')[offset:])