Problem

This article discusses the case where the store_test_results step fail with the following error:

failed uploading test results: File: <path_to_file> had the following problems:
* invalid top level element: <name_of_problematic_element>

How to address this issue

The error you're seeing means that the format of your test results file doesn't fully respect the expected JUnit XML format:

<?xml version="1.0" encoding="UTF-8"?>
<testsuites name="Mocha Tests" tests="3" failures="1">
  <testsuite tests="3">
    <testcase classname="foo1" name="ASuccessfulTest" time="10" file="src/__tests__/App.test.js" />
    <testcase classname="foo2" name="AnotherSuccessfulTest" time="5" file="src/__tests__/App.test.js" />
    <testcase classname="foo3" name="AFailingTest" time="1.1050" file="src/__tests__/App.test.js">
      <failure type="NotEnoughFoo"> details about failure </failure>
    </testcase>
  </testsuite>
</testsuites>

 
In order to troubleshoot, I suggests storing the file as an artifact, and reviewing its content. Doing so will allow you to identify the incorrect formatting.

Additional Resources

• Use the CircleCI CLI to split tests