在CircleCI上运行pytest-qt

Question

我试图pytest-qt在CircleCI上运行需要（用于测试PySide2对话框）的测试。我收到以下错误：

xdpyinfo was not found, X start can not be checked! Please install xdpyinfo!
============================= test session starts ==============================
platform linux -- Python 3.6.8, pytest-5.0.0, py-1.8.0, pluggy-0.12.0 -- /home/circleci/project-caveman/venv/bin/python3
cachedir: .pytest_cache
PySide2 5.13.0 -- Qt runtime 5.13.0 -- Qt compiled 5.13.0
rootdir: /home/circleci/project-caveman
plugins: cov-2.7.1, xvfb-1.2.0, qt-3.2.2
collected 1 item

tests/test_main.py::test_label_change_on_button_press Fatal Python error: Aborted

Aborted (core dumped)
Exited with code 134

我正在使用此配置文件：

version: 2
jobs:
  build:
    working_directory: ~/project-caveman
    docker:
      - image: circleci/python:3.6.8-stretch
    steps:
      - checkout

      # Dependencies
      - restore_cache:
          keys:
            - venv-{{ .Branch }}-{{ checksum "setup.py" }}
            - venv-{{ .Branch }}-
            - venv-
      - run:
          name: Install dependencies
          command: |
            python3 -m venv venv
            . venv/bin/activate
            pip install -e .[test] --progress-bar off
      - save_cache:
          key: venv-{{ .Branch }}-{{ checksum "setup.py" }}
          paths:
            - "venv"

      # Tests
      - run:
          name: Pytest
          command: |
            mkdir test-reports
            . venv/bin/activate
            xvfb-run -a pytest -s -v --doctest-modules --junitxml test-reports/junit.xml --cov=coveralls --cov-report term-missing
      - store_test_results:
          path: test-reports
      - run:
          name: Coveralls
          command: coveralls

非常感谢您的任何帮助。

Answer 1

我已经将容器拉到circleci/python:3.6.8-stretch本地，克隆了您的存储库并尝试执行测试，但是我可以重现该错误。

首先要做的是为Qt运行时启用调试模式，以便它输出一些有关错误的信息。这可以通过设置环境变量来完成QT_DEBUG_PLUGINS：

$ QT_DEBUG_PLUGINS=1 pytest -sv

现在可以立即清除运行测试的容器中缺少的内容。上面命令输出的摘录：

Got keys from plugin meta data ("xcb")
QFactoryLoader::QFactoryLoader() checking directory path "/usr/local/bin/platforms" ...
**Cannot load library /home/circleci/.local/lib/python3.6/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory)**
QLibraryPrivate::loadPlugin failed on "/home/circleci/.local/lib/python3.6/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so" : "Cannot load library /home/circleci/.local/lib/python3.6/site-packages/PySide2/Qt/plugins/platforms/libqxcb.so: (libxkbcommon-x11.so.0: cannot open shared object file: No such file or directory)"
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, webgl, xcb.

Aborted (core dumped)

修复很容易-安装libxkbcommon-x11-0软件包：

$ sudo apt update && sudo apt install -y libxkbcommon-x11-0

将此行添加到CircleCI配置中（在测试作业之前的某个位置，例如在安装软件包依赖项的作业中），然后测试应该可以正常运行。

除此之外，QT_DEBUG_PLUGINS=1全局设置很有意义，这样您以后就可以对最终的Qt运行时失败做出反应。

找不到xdpyinfo，无法检查X启动！请安装xdpyinfo！

如果要消除该警告，请安装x11-utils：

$ sudo apt install x11-utils