diff --git a/libmat2/archive.py b/libmat2/archive.py
index 7b9f335..dd63c50 100644
--- a/libmat2/archive.py
+++ b/libmat2/archive.py
@@ -21,7 +21,7 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
 
     # Those are the files that we _do not_ want to keep,
     # no matter if they are supported or not.
-    files_to_omit = set() # type: Set[Pattern]
+    files_to_omit = set()  # type: Set[Pattern]
 
     # what should the parser do if it encounters an unknown file in
     # the archive?
diff --git a/libmat2/office.py b/libmat2/office.py
index 07bbbb9..c6b324b 100644
--- a/libmat2/office.py
+++ b/libmat2/office.py
@@ -21,7 +21,7 @@ def _parse_xml(full_path: str):
     for _, (key, value) in ET.iterparse(full_path, ("start-ns", )):
         # The ns[0-9]+ namespaces are reserved for interal usage, so
         # we have to use an other nomenclature.
-        if re.match('^ns[0-9]+$', key, re.I):  #pragma: no cover
+        if re.match('^ns[0-9]+$', key, re.I):  # pragma: no cover
             key = 'mat' + key[2:]
 
         namespace_map[key] = value
diff --git a/libmat2/pdf.py b/libmat2/pdf.py
index bc7c8a6..5e19ef7 100644
--- a/libmat2/pdf.py
+++ b/libmat2/pdf.py
@@ -17,7 +17,7 @@ from gi.repository import Poppler, GLib
 from . import abstract
 
 poppler_version = Poppler.get_version()
-if LooseVersion(poppler_version) < LooseVersion('0.46'): # pragma: no cover
+if LooseVersion(poppler_version) < LooseVersion('0.46'):  # pragma: no cover
     raise ValueError("MAT2 needs at least Poppler version 0.46 to work. \
 The installed version is %s." % poppler_version)  # pragma: no cover
 
diff --git a/tests/test_climat2.py b/tests/test_climat2.py
index a94fc23..b84afdf 100644
--- a/tests/test_climat2.py
+++ b/tests/test_climat2.py
@@ -77,7 +77,6 @@ class TestCleanFolder(unittest.TestCase):
         shutil.rmtree('./tests/data/folder/')
 
 
-
 class TestCleanMeta(unittest.TestCase):
     def test_jpg(self):
         shutil.copy('./tests/data/dirty.jpg', './tests/data/clean.jpg')
diff --git a/tests/test_corrupted_files.py b/tests/test_corrupted_files.py
index 72d124f..aee1530 100644
--- a/tests/test_corrupted_files.py
+++ b/tests/test_corrupted_files.py
@@ -53,16 +53,21 @@ class TestUnsupportedFiles(unittest.TestCase):
 class TestCorruptedEmbedded(unittest.TestCase):
     def test_docx(self):
         shutil.copy('./tests/data/embedded_corrupted.docx', './tests/data/clean.docx')
-        parser, mimetype = parser_factory.get_parser('./tests/data/clean.docx')
+        parser, _ = parser_factory.get_parser('./tests/data/clean.docx')
         self.assertFalse(parser.remove_all())
         self.assertIsNotNone(parser.get_meta())
         os.remove('./tests/data/clean.docx')
 
     def test_odt(self):
+        expected = {
+                'create_system': 'Weird',
+                'date_time': '2018-06-10 17:18:18',
+                'meta.xml': 'harmful content'
+                }
         shutil.copy('./tests/data/embedded_corrupted.odt', './tests/data/clean.odt')
-        parser, mimetype = parser_factory.get_parser('./tests/data/clean.odt')
+        parser, _ = parser_factory.get_parser('./tests/data/clean.odt')
         self.assertFalse(parser.remove_all())
-        self.assertEqual(parser.get_meta(), {'create_system': 'Weird', 'date_time': '2018-06-10 17:18:18', 'meta.xml': 'harmful content'})
+        self.assertEqual(parser.get_meta(), expected)
         os.remove('./tests/data/clean.odt')
 
 
@@ -90,7 +95,7 @@ class TestCorruptedFiles(unittest.TestCase):
 
     def test_png2(self):
         shutil.copy('./tests/test_libmat2.py', './tests/clean.png')
-        parser, mimetype = parser_factory.get_parser('./tests/clean.png')
+        parser, _ = parser_factory.get_parser('./tests/clean.png')
         self.assertIsNone(parser)
         os.remove('./tests/clean.png')
 
@@ -134,7 +139,8 @@ class TestCorruptedFiles(unittest.TestCase):
 
     def test_bmp(self):
         shutil.copy('./tests/data/dirty.png', './tests/data/clean.bmp')
-        harmless.HarmlessParser('./tests/data/clean.bmp')
+        ret = harmless.HarmlessParser('./tests/data/clean.bmp')
+        self.assertIsNotNone(ret)
         os.remove('./tests/data/clean.bmp')
 
     def test_docx(self):
diff --git a/tests/test_deep_cleaning.py b/tests/test_deep_cleaning.py
index 82579a3..4f1920d 100644
--- a/tests/test_deep_cleaning.py
+++ b/tests/test_deep_cleaning.py
@@ -23,7 +23,6 @@ class TestZipMetadata(unittest.TestCase):
                 self.assertEqual(inside_p.get_meta(), {})
         shutil.rmtree(tempdir)
 
-
     def __check_zip_meta(self, p):
         zipin = zipfile.ZipFile(p.filename)
         for item in zipin.infolist():
@@ -135,4 +134,3 @@ class TestRsidRemoval(unittest.TestCase):
 
         os.remove('./tests/data/clean.docx')
         os.remove('./tests/data/clean.cleaned.docx')
-
diff --git a/tests/test_libmat2.py b/tests/test_libmat2.py
index d8c7b83..7a1a9e7 100644
--- a/tests/test_libmat2.py
+++ b/tests/test_libmat2.py
@@ -12,7 +12,7 @@ from libmat2 import check_dependencies
 class TestCheckDependencies(unittest.TestCase):
     def test_deps(self):
         ret = check_dependencies()
-        for key, value in ret.items():
+        for value in ret.values():
             self.assertTrue(value)
 
 
diff --git a/tests/test_policy.py b/tests/test_policy.py
index 890f8c3..ef55644 100644
--- a/tests/test_policy.py
+++ b/tests/test_policy.py
@@ -29,4 +29,3 @@ class TestPolicy(unittest.TestCase):
         with self.assertRaises(ValueError):
             p.unknown_member_policy = UnknownMemberPolicy('unknown_policy_name_totally_invalid')
         os.remove('./tests/data/clean.docx')
-