diff --git a/tests/test_base.py b/tests/test_base.py
index 9fbdcf7..cba407c 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -47,9 +47,11 @@ class TestBase(TestCase):
         bobj.clean()
         self.assertFalse(os.path.exists(self.dirname))
 
+    @mock.patch('os.path.exists')
     @mock.patch('fs_uae_wrapper.utils.get_config')
-    def test_normalize_options(self, get_config):
+    def test_normalize_options(self, get_config, os_exists):
 
+        os_exists.return_value = True
         bobj = base.Base('Config.fs-uae', utils.CmdOption(), {})
 
         get_config.return_value = {'kickstarts_dir': '/some/path'}
@@ -92,6 +94,28 @@ class TestBase(TestCase):
         bobj._normalize_options()
         self.assertDictEqual(bobj.fsuae_options, {})
 
+    @mock.patch('os.path.exists')
+    @mock.patch('fs_uae_wrapper.utils.get_config')
+    def test_normalize_options_path_not_exists(self, get_config, os_exists):
+
+        os_exists.return_value = False
+        bobj = base.Base('Config.fs-uae', utils.CmdOption(), {})
+
+        get_config.return_value = {'kickstarts_dir': '/some/path'}
+        bobj._normalize_options()
+        self.assertDictEqual(bobj.fsuae_options, {})
+
+        os.chdir(self.dirname)
+        get_config.return_value = {'fmv_rom': 'bar'}
+        bobj._normalize_options()
+        self.assertDictEqual(bobj.fsuae_options, {'fmv_rom': 'bar'})
+
+        get_config.return_value = {'floppies_dir': '../some/path'}
+        bobj.fsuae_options = utils.CmdOption()
+        bobj._normalize_options()
+        self.assertDictEqual(bobj.fsuae_options,
+                             {'floppies_dir': '../some/path'})
+
     def test_set_assets_paths(self):
 
         bobj = base.Base('Config.fs-uae', utils.CmdOption(), {})
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 76b8f62..4537047 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -234,11 +234,13 @@ class TestCmdOptions(TestCase):
         self.assertListEqual(sorted(cmd.list()),
                              ['--fast_memory=4096', '--fullscreen'])
 
+    @mock.patch('os.path.exists')
     @mock.patch('os.getenv')
     @mock.patch('os.path.expandvars')
     @mock.patch('distutils.spawn.find_executable')
-    def test_interpolate_variables(self, find_exe, expandv, getenv):
+    def test_interpolate_variables(self, find_exe, expandv, getenv, os_exists):
 
+        os_exists.return_value = True
         itrpl = utils.interpolate_variables
 
         string = '$CONFIG/../path/to/smth'
@@ -264,3 +266,11 @@ class TestCmdOptions(TestCase):
                          '$BASE')
         self.assertEqual(itrpl(string, '/home/user/Config.fs-uae', 'base'),
                          'base')
+
+    @mock.patch('os.getenv')
+    @mock.patch('os.path.expandvars')
+    def test_interpolate_variables_path_not_exists(self, expandv, getenv):
+        itrpl = utils.interpolate_variables
+
+        string = '$CONFIG/../path/to/smth'
+        self.assertEqual(itrpl(string, '/home/user/Config.fs-uae'), string)