test dash_process_server without PYTHONPATH

Author: alexcjohnson

package.json

@@ -16,7 +16,7 @@
     "private::test.py.deploy-standard": "npm run private::test.setup-standard && cd \\@plotly/dash-generator-test-component-standard && pip install -e .",
     "private::test.R.deploy-nested": "npm run private::test.setup-nested && cd \\@plotly/dash-generator-test-component-nested && sudo R CMD INSTALL .",
     "private::test.R.deploy-standard": "npm run private::test.setup-standard && cd \\@plotly/dash-generator-test-component-standard && sudo R CMD INSTALL .",
-    "private::test.unit-dash": "PYTHONPATH=tests/assets pytest tests/unit",
+    "private::test.unit-dash": "pytest tests/unit",
     "private::test.unit-renderer": "cd dash-renderer && npm run test",
     "private::test.integration-dash": "TESTFILES=$(circleci tests glob \"tests/integration/**/test_*.py\" | circleci tests split --split-by=timings) && pytest --headless --nopercyfinalize --junitxml=test-reports/junit_intg.xml ${TESTFILES}",
     "format": "run-s private::format.*",

tests/unit/test_app_runners.py

@@ -1,3 +1,4 @@
+import os
 import sys
 import requests
 import pytest
@@ -25,6 +26,9 @@ def test_threaded_server_smoke(dash_thread_server):
     sys.version_info < (3,), reason="requires python3 for process testing"
 )
 def test_process_server_smoke(dash_process_server):
+    this_dir = os.path.dirname(__file__)
+    assets_dir = os.path.abspath(os.path.join(this_dir, "..", "assets"))
+    os.chdir(assets_dir)
     dash_process_server("simple_app")
     r = requests.get(dash_process_server.url)
     assert r.status_code == 200, "the server is reachable"