The exact message received from jenkins is:
No test report files were found. Configuration error?
Build step \'Publish JUnit test result report\' changed bui
For my Android project which has multiple Gradle product flavors I used the following path for Test report XMLs
:
**/build/test-results/**/TEST-*.xml
Jenkins looks for the path from the workspace root. Ensure that the given path is correct or use wildcards to look in multiple locations. Try using **/reports/TEST-*.xml
Are you sure the reports folder is right under the workspace? Verify manually if the test result files are indeed present in the location given in the path.