diff --git a/tests/test_checks.py b/tests/test_checks.py
index 28fa5c72..d36243fc 100644
--- a/tests/test_checks.py
+++ b/tests/test_checks.py
@@ -5,16 +5,23 @@ from slpkg.load_data import LoadData
 
 class TestPkgInstalled(unittest.TestCase):
 
-    def setUp(self):
+    """ Test for installed.
+    """
+
+    def setUp(self) -> None:
         load = LoadData()
         self.data = load.load('sbo')
         self.check = Check('sbo')
         self.packages = ['colored', 'sbo-create', 'sun']
 
-    def test_check_exists(self):
+    def test_check_exists(self) -> None:
+        """ Check if packages exist.
+        """
         self.assertIsNone(self.check.package_exists_in_the_database(self.packages, self.data))
 
-    def test_check_is_installed(self):
+    def test_check_is_installed(self) -> None:
+        """ Check if installed.
+        """
         self.assertIsNone(self.check.is_package_installed(self.packages))