diff --git a/ironic_tempest_plugin/tests/api/admin/test_nodes.py b/ironic_tempest_plugin/tests/api/admin/test_nodes.py
index 688a94f..e4a8eea 100644
--- a/ironic_tempest_plugin/tests/api/admin/test_nodes.py
+++ b/ironic_tempest_plugin/tests/api/admin/test_nodes.py
@@ -138,14 +138,14 @@
         body = self.client.get_node_boot_device(self.node['uuid'])
         self.assertIn('boot_device', body)
         self.assertIn('persistent', body)
-        self.assertTrue(isinstance(body['boot_device'], six.string_types))
-        self.assertTrue(isinstance(body['persistent'], bool))
+        self.assertIsInstance(body['boot_device'], six.string_types)
+        self.assertIsInstance(body['persistent'], bool)
 
     @test.idempotent_id('3622bc6f-3589-4bc2-89f3-50419c66b133')
     def test_get_node_supported_boot_devices(self):
         body = self.client.get_node_supported_boot_devices(self.node['uuid'])
         self.assertIn('supported_boot_devices', body)
-        self.assertTrue(isinstance(body['supported_boot_devices'], list))
+        self.assertIsInstance(body['supported_boot_devices'], list)
 
     @test.idempotent_id('f63b6288-1137-4426-8cfe-0d5b7eb87c06')
     def test_get_console(self):