Install xeus-python kernelspec for tests

README.md

@@ -39,8 +39,6 @@ XEUS_LOG=1 jupyter lab --no-browser --watch
 
 ### Tests
 
-Make sure `xeus-python` is installed and `jupyter --paths` points to where the kernel is installed.
-
 To run the tests:
 
 ```bash

azure-pipelines.yml

@@ -28,7 +28,6 @@ steps:
 
 - bash: |
     source activate jupyterlab-debugger
-    export JUPYTER_PATH=${CONDA_PREFIX}/share/jupyter
     export XEUS_LOG=1
     jlpm run test
   displayName: Run the tests

tests/run-test.py

@@ -1,10 +1,36 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
 
+import json
 import os
-from jupyterlab.tests.test_app import run_jest
+from os.path import join as pjoin
+
+from jupyter_core import paths
+from jupyterlab.tests.test_app import run_jest, JestApp
 
 HERE = os.path.realpath(os.path.dirname(__file__))
 
+
+def _install_xpython_kernel():
+    # Mimics: https://github.com/jupyterlab/jupyterlab/blob/cd2fb6ac3ecfae2bb4bcab84797932e625e9bb2f/jupyterlab/tests/test_app.py#L80-L95
+    kernel_json = {
+        'argv': [
+            'xpython',
+            '-f', '{connection_file}'
+        ],
+        'display_name': "xpython",
+        'language': 'python'
+    }
+    kernel_dir = pjoin(paths.jupyter_data_dir(), 'kernels', 'xpython')
+    os.makedirs(kernel_dir)
+    with open(pjoin(kernel_dir, 'kernel.json'), 'w') as f:
+        f.write(json.dumps(kernel_json))
+
+
 if __name__ == '__main__':
+    jest_app = JestApp.instance()
+
+    # install the kernel spec for xeus-python
+    _install_xpython_kernel()
+
     run_jest(HERE)