Add basic unit tests for set_to_object()

+from unittest import TestCase, main
+
+from op_robot_tests.tests_files.service_keywords import set_to_object
+
+
+class TestSetToObject(TestCase):
+    def test_raises_1(self):
+        given = None
+        with self.assertRaises(TypeError):
+            given = set_to_object(given, 'foo[0]', 1)
+
+    def test_raises_2(self):
+        given = {'foo': None}
+        with self.assertRaises(TypeError):
+            given = set_to_object(given, 'foo[0]', 1)
+
+    def test_1(self):
+        given = {}
+        expected = {'foo': 1}
+        given = set_to_object(given, 'foo', 1)
+        self.assertEqual(given, expected)
+
+    def test_2(self):
+        given = {'foo': []}
+        expected = {'foo': [1]}
+        given = set_to_object(given, 'foo[0]', 1)
+        self.assertEqual(given, expected)
+
+    def test_3(self):
+        given = {}
+        expected = {'foo': [1]}
+        given = set_to_object(given, 'foo[0]', 1)
+        self.assertEqual(given, expected)
+
+    def test_4(self):
+        given = {}
+        expected = {'foo': {'bar': 1}}
+        given = set_to_object(given, 'foo.bar', 1)
+        self.assertEqual(given, expected)
+
+    def test_5(self):
+        given = {}
+        expected = {'foo': [None, {'bar': 1}]}
+        given = set_to_object(given, 'foo[1].bar', 1)
+        self.assertEqual(given, expected)
+
+    def test_6(self):
+        given = {}
+        expected = {'foo': [{'bar': [1]}]}
+        given = set_to_object(given, 'foo[0].bar[0]', 1)
+        self.assertEqual(given, expected)
+
+    def test_7(self):
+        given = {}
+        expected = {'foo': [{'bar': [1]}, None, None]}
+        given = set_to_object(given, 'foo[-3].bar[-1]', 1)
+        self.assertEqual(given, expected)
+
+    def test_8(self):
+        given = {'foo': [{'bar': [1]}]}
+        expected = {'foo': [{'bar': [1]}, None, {'baz': [2]}]}
+        given = set_to_object(given, 'foo[2].baz[0]', 2)
+        self.assertEqual(given, expected)
+
+    def test_9(self):
+        given = {'foo': [{'bar': [1]}]}
+        expected = {'foo': [{'baz': [2, None]}, None, {'bar': [1]}]}
+        given = set_to_object(given, 'foo[-3].baz[-2]', 2)
+        self.assertEqual(given, expected)
+
+
+if __name__ == '__main__':
+    main()