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diff --git a/tests/unittest_pyreverse_diadefs.py b/tests/unittest_pyreverse_diadefs.py
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+++ b/tests/unittest_pyreverse_diadefs.py
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+# Copyright (c) 2008-2010, 2013 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
+# Copyright (c) 2014 Google, Inc.
+# Copyright (c) 2014 Arun Persaud <arun@nubati.net>
+# Copyright (c) 2015-2017 Claudiu Popa <pcmanticore@gmail.com>
+# Copyright (c) 2015 Ionel Cristian Maries <contact@ionelmc.ro>
+# Copyright (c) 2016 Derek Gustafson <degustaf@gmail.com>
+# Copyright (c) 2018 Sushobhit <31987769+sushobhit27@users.noreply.github.com>
+
+# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
+
+"""
+unit test for the extensions.diadefslib modules
+"""
+
+import astroid
+import pytest
+
+from pylint.pyreverse.diadefslib import *
+from pylint.pyreverse.inspector import Linker
+from unittest_pyreverse_writer import Config, get_project
+
+
+def _process_classes(classes):
+    """extract class names of a list"""
+    return sorted([(isinstance(c.node, astroid.ClassDef), c.title) for c in classes])
+
+
+def _process_relations(relations):
+    """extract relation indices from a relation list"""
+    result = []
+    for rel_type, rels in relations.items():
+        for rel in rels:
+            result.append((rel_type, rel.from_object.title, rel.to_object.title))
+    result.sort()
+    return result
+
+
+@pytest.fixture
+def HANDLER():
+    return DiadefsHandler(Config())
+
+
+@pytest.fixture(scope="module")
+def PROJECT():
+    return get_project("data")
+
+
+def test_option_values(HANDLER, PROJECT):
+    """test for ancestor, associated and module options"""
+    df_h = DiaDefGenerator(Linker(PROJECT), HANDLER)
+    cl_config = Config()
+    cl_config.classes = ["Specialization"]
+    cl_h = DiaDefGenerator(Linker(PROJECT), DiadefsHandler(cl_config))
+    assert (0, 0) == df_h._get_levels()
+    assert False == df_h.module_names
+    assert (-1, -1) == cl_h._get_levels()
+    assert True == cl_h.module_names
+    for hndl in [df_h, cl_h]:
+        hndl.config.all_ancestors = True
+        hndl.config.all_associated = True
+        hndl.config.module_names = True
+        hndl._set_default_options()
+        assert (-1, -1) == hndl._get_levels()
+        assert True == hndl.module_names
+    handler = DiadefsHandler(Config())
+    df_h = DiaDefGenerator(Linker(PROJECT), handler)
+    cl_config = Config()
+    cl_config.classes = ["Specialization"]
+    cl_h = DiaDefGenerator(Linker(PROJECT), DiadefsHandler(cl_config))
+    for hndl in [df_h, cl_h]:
+        hndl.config.show_ancestors = 2
+        hndl.config.show_associated = 1
+        hndl.config.module_names = False
+        hndl._set_default_options()
+        assert (2, 1) == hndl._get_levels()
+        assert False == hndl.module_names
+
+    # def test_default_values():
+    """test efault values for package or class diagrams"""
+    # TODO : should test difference between default values for package
+    # or class diagrams
+
+
+class TestDefaultDiadefGenerator(object):
+    def test_known_values1(self, HANDLER, PROJECT):
+        dd = DefaultDiadefGenerator(Linker(PROJECT), HANDLER).visit(PROJECT)
+        assert len(dd) == 2
+        keys = [d.TYPE for d in dd]
+        assert keys == ["package", "class"]
+        pd = dd[0]
+        assert pd.title == "packages No Name"
+        modules = sorted(
+            [(isinstance(m.node, astroid.Module), m.title) for m in pd.objects]
+        )
+        assert modules == [
+            (True, "data"),
+            (True, "data.clientmodule_test"),
+            (True, "data.suppliermodule_test"),
+        ]
+        cd = dd[1]
+        assert cd.title == "classes No Name"
+        classes = _process_classes(cd.objects)
+        assert classes == [
+            (True, "Ancestor"),
+            (True, "DoNothing"),
+            (True, "Interface"),
+            (True, "Specialization"),
+        ]
+
+    _should_rels = [
+        ("association", "DoNothing", "Ancestor"),
+        ("association", "DoNothing", "Specialization"),
+        ("implements", "Ancestor", "Interface"),
+        ("specialization", "Specialization", "Ancestor"),
+    ]
+
+    def test_exctract_relations(self, HANDLER, PROJECT):
+        """test extract_relations between classes"""
+        cd = DefaultDiadefGenerator(Linker(PROJECT), HANDLER).visit(PROJECT)[1]
+        cd.extract_relationships()
+        relations = _process_relations(cd.relationships)
+        assert relations == self._should_rels
+
+    def test_functional_relation_extraction(self):
+        """functional test of relations extraction;
+        different classes possibly in different modules"""
+        # XXX should be catching pyreverse environnement problem but doesn't
+        # pyreverse doesn't extracts the relations but this test ok
+        project = get_project("data")
+        handler = DiadefsHandler(Config())
+        diadefs = handler.get_diadefs(project, Linker(project, tag=True))
+        cd = diadefs[1]
+        relations = _process_relations(cd.relationships)
+        assert relations == self._should_rels
+
+    def test_known_values2(self, HANDLER):
+        project = get_project("data.clientmodule_test")
+        dd = DefaultDiadefGenerator(Linker(project), HANDLER).visit(project)
+        assert len(dd) == 1
+        keys = [d.TYPE for d in dd]
+        assert keys == ["class"]
+        cd = dd[0]
+        assert cd.title == "classes No Name"
+        classes = _process_classes(cd.objects)
+        assert classes == [(True, "Ancestor"), (True, "Specialization")]
+
+
+def test_known_values1(HANDLER, PROJECT):
+    HANDLER.config.classes = ["Specialization"]
+    cdg = ClassDiadefGenerator(Linker(PROJECT), HANDLER)
+    special = "data.clientmodule_test.Specialization"
+    cd = cdg.class_diagram(PROJECT, special)
+    assert cd.title == special
+    classes = _process_classes(cd.objects)
+    assert classes == [
+        (True, "data.clientmodule_test.Ancestor"),
+        (True, special),
+        (True, "data.suppliermodule_test.DoNothing"),
+    ]
+
+
+def test_known_values2(HANDLER, PROJECT):
+    HANDLER.config.classes = ["Specialization"]
+    HANDLER.config.module_names = False
+    cd = ClassDiadefGenerator(Linker(PROJECT), HANDLER).class_diagram(
+        PROJECT, "data.clientmodule_test.Specialization"
+    )
+    assert cd.title == "data.clientmodule_test.Specialization"
+    classes = _process_classes(cd.objects)
+    assert classes == [
+        (True, "Ancestor"),
+        (True, "DoNothing"),
+        (True, "Specialization"),
+    ]