adding .coveragerc and some tests

.coveragerc

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+[run]
+include = objects/*
+omit = tests/*

tests/__init__.py

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+"""Objects unittests."""

tests/test_injections.py

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+"""Objects injections unittests."""
+
+import unittest2 as unittest
+from objects.injections import Injection
+
+
+class InjectionTest(unittest.TestCase):
+
+    """Injection test cases."""
+
+    def test_init(self):
+        """Test Injection creation and initialization."""
+        injection = Injection('some_arg_name', 'some_value')
+
+        self.assertEqual(injection.name, 'some_arg_name')
+        self.assertEqual(injection.injectable, 'some_value')