Achieve 100% test coverage on Action Space Base (#109)

test: Added final tests for action space base

tests/units/actions/test_action_space_base.py

@@ -50,4 +50,28 @@ def test_size(self):
         fake_action_space.get_actions = MagicMock(return_value=[])
 
         # THEN
-        self.assertEqual(fake_action_space.size, 0)
+        self.assertEqual(fake_action_space.size, 0)
+
+    def test_get_actions_id(self):
+
+        # GIVEN
+        fake_action_space = FakeActionSpace()
+
+        # WHEN
+        fake_action_space.get_actions = MagicMock(return_value=[])
+
+        # THEN
+        self.assertEqual(fake_action_space.get_actions_id(), [])
+
+    def test_get_actions_id_with_actions(self):
+
+        # GIVEN
+        fake_action_space = FakeActionSpace()
+
+        # WHEN
+        fake_action_space.get_actions = MagicMock(
+            return_value=[MagicMock(__id__="action1"), MagicMock(__id__="action2")]
+        )
+
+        # THEN
+        self.assertEqual(fake_action_space.get_actions_id(), ["action1", "action2"])