pySim/utils_test.py: prepare this to be executed on Jenkins

As it turns out, we had this set of unit tests since 2018, but
so far they were not executed during the build verification.

Let's fix this:

  * run unittest in discovery mode for all files in 'tests/' (commented out);
  * rename this file, so it can be automatically detected and executed;
  * properly import the API to be tested.

Currently 2 out of 16 unit tests are failing, so we need to get
them passing first and then uncomment the unittest execution.

Change-Id: I4d4facfabc75187acd5238ff4d0f26022bd58f82

contrib/jenkins.sh

@@ -15,6 +15,10 @@ pip install pytlv
 pip install pyyaml
 pip install cmd2
 
+# Execute automatically discovered unit tests first
+# TODO: uncomment once all tests are passing
+# python -m unittest discover -v -s tests/
+
 cd pysim-testdata
 ../tests/pysim-test.sh
 

tests/test_utils.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 
 import unittest
-import utils 
+import pySim.utils as utils
 
 class DecTestCase(unittest.TestCase):