Add ipywidgets to base installation

integration-tests/test_extensions.py

@@ -40,7 +40,7 @@ def test_nbextensions():
         assert '{} \x1b[32m enabled \x1b[0m'.format(e) in proc.stdout.decode()
 
     # Ensure we have 'OK' messages in our stdout, to make sure everything is importable
-    proc.stderr.decode() == '      - Validating: \x1b[32mOK\x1b[0m\n' * len(extensions)
+    assert proc.stderr.decode() == '      - Validating: \x1b[32mOK\x1b[0m\n' * len(extensions)
 
 
 def test_labextensions():

tljh/installer.py

@@ -163,7 +163,8 @@ def ensure_jupyterlab_extensions():
     Install the JupyterLab extensions we want.
     """
     extensions = [
-        '@jupyterlab/hub-extension'
+        '@jupyterlab/hub-extension',
+        '@jupyter-widgets/jupyterlab-manager'
     ]
     subprocess.check_output([
         os.path.join(USER_ENV_PREFIX, 'bin/jupyter'),
@@ -243,7 +244,9 @@ def ensure_user_environment(user_requirements_txt_file):
         # nbgitpuller for easily pulling in Git repositories
         'nbgitpuller==0.6.1',
         # nbresuse to show people how much RAM they are using
-        'nbresuse==0.3.0'
+        'nbresuse==0.3.0',
+        # Most people consider ipywidgets to be part of the core notebook experience
+        'ipywidgets==7.4.2'
     ])
 
     if user_requirements_txt_file: