Implemented Singleton metaclass

tests/utils/dummy.py

@@ -0,0 +1,25 @@
+from types import MethodType
+
+
+def dummy_class_factory(attributes, functions, base_class=object, meta_class=type):
+
+    class DummyClass(base_class, metaclass=meta_class):
+        """
+        Class representing dummy data.
+        """
+        def __init__(self):
+            pass
+
+    for key, value in attributes.items():
+        if callable(value):
+            raise ValueError
+        else:
+            setattr(DummyClass, key, value)
+
+    for key, value in functions.items():
+        if not callable(value):
+            raise ValueError
+        else:
+            setattr(DummyClass, key, MethodType(value, DummyClass))
+
+    return DummyClass