wercker中的链接管道(默认执行)不会产生结果

Question

我在wercker中有下面的管道。它们对于复制问题的目的是完全相同的。

setup:
  steps:
    - script:
      name: set yarn cache
      code: yarn config set cache-folder $WERCKER_CACHE_DIR/yarn
    - script:
      name: install dependencies
      code: yarn
    - script:
      name: ls
      code: ls
    - script:
      name: test-unit
      code: yarn test

test-unit:
  steps:
    - script:
      name: set yarn cache
      code: yarn config set cache-folder $WERCKER_CACHE_DIR/yarn
    - script:
      name: install dependencies
      code: yarn
    - script:
      name: ls
      code: ls
    - script:
      name: test-unit
      code: yarn test

一个被配置为在推送时执行，第二个被配置为在第一个之后执行。

​

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问题是流水线不会产生相同的结果。在第二个管道中，我的命令，例如纱线测试，在几秒钟内产生空的结果。在first (在推送时执行)中，测试运行良好。

下面是第一个管道的输出：

export WERCKER_STEP_ROOT="/pipeline/script-3bab60c8-5cfd-4b86-9aa3-733e93e12d12"
export WERCKER_STEP_ID="script-3bab60c8-5cfd-4b86-9aa3-733e93e12d12"
export WERCKER_STEP_OWNER="wercker"
export WERCKER_STEP_NAME="script"
export WERCKER_REPORT_NUMBERS_FILE="/report/script-3bab60c8-5cfd-4b86-9aa3-733e93e12d12/numbers.ini"
export WERCKER_REPORT_MESSAGE_FILE="/report/script-3bab60c8-5cfd-4b86-9aa3-733e93e12d12/message.txt"
export WERCKER_REPORT_ARTIFACTS_DIR="/report/script-3bab60c8-5cfd-4b86-9aa3-733e93e12d12/artifacts"
source "/pipeline/script-3bab60c8-5cfd-4b86-9aa3-733e93e12d12/run.sh" < /dev/null
yarn run v1.7.0
$ jest --verbose
PASS src/components/auth/__tests__/passwordValidation.spec.js
  Password Validation Component
    ✓ renders a vue instance (27ms)
    ✓ show all errors for invalid password (16ms)
    ✓ show no errors for valid password (6ms)

PASS src/components/__tests__/payment.spec.js
  Payment Form Component
    ✓ renders a vue instance (44ms)
   ..... 

Test Suites: 7 passed, 7 total
Tests:       24 passed, 24 total
Snapshots:   0 total
Time:        3.261s
Ran all test suites.
Done in 4.49s.

下面是有问题的第二个管道的输出：

export WERCKER_STEP_ROOT="/pipeline/script-22826921-2896-40cc-a7f2-d99d0c5377b9"
export WERCKER_STEP_ID="script-22826921-2896-40cc-a7f2-d99d0c5377b9"
export WERCKER_STEP_OWNER="wercker"
export WERCKER_STEP_NAME="script"
export WERCKER_REPORT_NUMBERS_FILE="/report/script-22826921-2896-40cc-a7f2-d99d0c5377b9/numbers.ini"
export WERCKER_REPORT_MESSAGE_FILE="/report/script-22826921-2896-40cc-a7f2-d99d0c5377b9/message.txt"
export WERCKER_REPORT_ARTIFACTS_DIR="/report/script-22826921-2896-40cc-a7f2-d99d0c5377b9/artifacts"
source "/pipeline/script-22826921-2896-40cc-a7f2-d99d0c5377b9/run.sh" < /dev/null
yarn run v1.7.0
$ jest --verbose
Done in 0.08s.

所以这是一个问题，我的链式管道中的命令不会产生任何结果。ls命令在第一个和第二个管道中返回相同的内容。问题不仅仅在于jest，像build、lint等其他东西在第二个流水线中也会产生同样的零结果。

发生了什么，如何修复它，使命令在链式管道中工作？