diff --git a/jupyterlab_launcher/tests/app-settings/overrides.json b/jupyterlab_launcher/tests/app-settings/overrides.json
new file mode 100644
index 00000000..3d39e80e
--- /dev/null
+++ b/jupyterlab_launcher/tests/app-settings/overrides.json
@@ -0,0 +1,5 @@
+{
+  "@jupyterlab/apputils-extension:themes": {
+    "theme": "JupyterLab Dark"
+  }
+}
diff --git a/jupyterlab_launcher/tests/test_settings_api.py b/jupyterlab_launcher/tests/test_settings_api.py
index 55d9b581..faa7f511 100644
--- a/jupyterlab_launcher/tests/test_settings_api.py
+++ b/jupyterlab_launcher/tests/test_settings_api.py
@@ -23,21 +23,35 @@ class SettingsAPITest(LabTestBase):
     """Test the settings web service API"""
 
     def setUp(self):
+        # Copy the schema files.
         src = os.path.join(
             os.path.abspath(os.path.dirname(__file__)),
             'schemas',
             '@jupyterlab')
         dst = os.path.join(self.lab_config.schemas_dir, '@jupyterlab')
-        if not os.path.exists(dst):
-            shutil.copytree(src, dst)
+        if os.path.exists(dst):
+            shutil.rmtree(dst)
+        shutil.copytree(src, dst)
+
+        # Copy the overrides file.
+        src = os.path.join(
+            os.path.abspath(os.path.dirname(__file__)),
+            'app-settings',
+            'overrides.json')
+        dst = os.path.join(self.lab_config.app_settings_dir, 'overrides.json')
+        if os.path.exists(dst):
+            os.remove(dst)
+        shutil.copyfile(src, dst)
         self.settings_api = SettingsAPI(self.request)
 
     def test_get(self):
         id = '@jupyterlab/apputils-extension:themes'
         data = self.settings_api.get(id).json()
+        schema = data['schema']
 
         assert data['id'] == id
-        assert len(data['schema'])
+        # Check that overrides.json file is respected.
+        assert schema['properties']['theme']['default'] == 'JupyterLab Dark'
         assert 'raw' in data
 
     def test_get_bad(self):
diff --git a/jupyterlab_launcher/tests/test_workspaces_api.py b/jupyterlab_launcher/tests/test_workspaces_api.py
index b663cdce..bf1cf817 100644
--- a/jupyterlab_launcher/tests/test_workspaces_api.py
+++ b/jupyterlab_launcher/tests/test_workspaces_api.py
@@ -31,8 +31,9 @@ def setUp(self):
         for item in os.listdir(data):
             src = os.path.join(data, item)
             dst = os.path.join(self.lab_config.workspaces_dir, item)
-            if not os.path.exists(dst):
-                shutil.copy(src, self.lab_config.workspaces_dir)
+            if os.path.exists(dst):
+                os.remove(dst)
+            shutil.copy(src, self.lab_config.workspaces_dir)
         self.workspaces_api = WorkspacesAPI(self.request)
 
     def test_delete(self):
diff --git a/jupyterlab_launcher/tests/utils.py b/jupyterlab_launcher/tests/utils.py
index 38aacad2..290a32be 100644
--- a/jupyterlab_launcher/tests/utils.py
+++ b/jupyterlab_launcher/tests/utils.py
@@ -44,6 +44,7 @@ def tmp(*parts):
         cls.config_dir = tmp('config')
         cls.runtime_dir = tmp('runtime')
         cls.lab_dir = tmp('lab')
+        cls.app_settings_dir = tmp('appsettings')
         cls.lab_schemas = tmp('labschemas')
         cls.lab_settings = tmp('labsettings')
         cls.lab_workspaces = tmp('labworkspaces')
@@ -60,6 +61,7 @@ def tmp(*parts):
         })
         cls.env_patch.start()
         cls.lab_config = LabConfig(
+            app_settings_dir=cls.app_settings_dir,
             schemas_dir=cls.lab_schemas,
             user_settings_dir=cls.lab_settings,
             workspaces_dir=cls.lab_workspaces)
diff --git a/jupyterlab_launcher/tests/workspaces/foo.jupyterlab-workspace b/jupyterlab_launcher/tests/workspaces/foo.jupyterlab-workspace
index 02bdc619..1a0de541 100644
--- a/jupyterlab_launcher/tests/workspaces/foo.jupyterlab-workspace
+++ b/jupyterlab_launcher/tests/workspaces/foo.jupyterlab-workspace
@@ -1 +1 @@
-{"data": {}, "metadata": {"id": "foo"}}
\ No newline at end of file
+{"data": {}, "metadata": {"id": "foo"}}
diff --git a/setup.py b/setup.py
index b69882d7..7626b3da 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,6 @@
     name            = 'jupyterlab_launcher',
     version         = __version__,
     packages        = find_packages('.'),
-    package_data    = { 'jupyterlab_launcher': ['*.html'] },
     description     = "Jupyter Launcher",
     long_description= """
     This package is used to launch an application built using JupyterLab
@@ -39,6 +38,7 @@
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
     ],
+    include_package_data = True
 )
 
 if 'setuptools' in sys.modules: