test: add tests for util module

Add some basic unit tests for functions in util. Need to fill
in some additional documentation/context for tests.

tests/test_util.py

@@ -0,0 +1,96 @@
+import logging
+import pytest
+import yaml
+import textwrap
+from datetime import datetime
+from synorchestrator import util
+
+logging.basicConfig(level=logging.DEBUG)
+logger = logging.getLogger(__name__)
+
+
+def test_heredoc():
+    test_string = util.heredoc(
+        '''
+        Mock string:
+        {value}
+        ''', {'value': 'mock_val'}
+    )
+
+    mock_string = "Mock string:\nmock_val\n"
+    assert(test_string == textwrap.dedent(mock_string))
+
+
+def test_get_yaml(tmpdir):
+    mock_string = """
+    section:
+       key: {}
+    """
+    mock_file = tmpdir.join('mock.yaml')
+    mock_file.write(textwrap.dedent(mock_string))
+
+    test_object = util.get_yaml(str(mock_file))
+    mock_object = {'section': {'key': {}}}
+
+    assert(test_object == mock_object)
+
+
+def test_save_yaml(tmpdir):
+    mock_object = {'section': {'key': {}}}
+
+    mock_file = tmpdir.join('mock.yaml')
+
+    util.save_yaml(str(mock_file), mock_object)
+
+    mock_string = "section:\n  key: {}\n"
+
+    assert(mock_file.read() == mock_string)
+
+
+def test_get_json(tmpdir):
+    mock_string = """
+    {
+       "section": {
+           "key": {}
+        }
+    }
+    """
+    mock_file = tmpdir.join('mock.json')
+    mock_file.write(textwrap.dedent(mock_string))
+
+    test_object = util.get_json(str(mock_file))
+    mock_object = {'section': {'key': {}}}
+
+    assert(test_object == mock_object)
+
+
+def test_save_json(tmpdir):
+    mock_object = {'section': {'key': {}}}
+
+    mock_file = tmpdir.join('mock.json')
+
+    util.save_json(str(mock_file), mock_object)
+
+    mock_string = """{
+    "section": {
+        "key": {}
+    }
+}"""
+
+    assert(mock_file.read() == textwrap.dedent(mock_string))
+
+
+def test_ctime2datetime():
+    mock_string = 'Sun Jan 01 00:00:00 2000'
+
+    test_datetime = util.ctime2datetime(mock_string)
+
+    assert(test_datetime == datetime(2000, 1, 1, 0, 0))
+
+
+def test_convert_timedelta():
+    mock_duration = datetime(2000, 1, 1, 1, 1) - datetime(2000, 1, 1, 0, 0)
+
+    test_string = util.convert_timedelta(mock_duration)
+
+    assert(test_string == '1h:1m:0s')