pytest 3.0 breaks Jenkins' "Publish JUnit test result report" for doctests

Upgrading from pytest 2.9.2 to 3.0.x breaks the build step "Publish JUnit test result report" in Jenkins if a doctest is involved in the tests.

Jenins Error message:

ERROR: Build step failed with exception
.../PYTHON/Python2.7/README.txt is not a directory.
    at org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:488)
    at hudson.util.DirScanner$Glob.scan(DirScanner.java:128)
    at hudson.FilePath$42.invoke(FilePath.java:2162)
    at hudson.FilePath$42.invoke(FilePath.java:2155)
    at hudson.FilePath.act(FilePath.java:1018)
    at hudson.FilePath.act(FilePath.java:996)
    at hudson.FilePath.copyRecursiveTo(FilePath.java:2155)
    at hudson.FilePath.copyRecursiveTo(FilePath.java:2141)
    at hudson.FilePath.copyRecursiveTo(FilePath.java:2124)
    at hudson.FilePath.copyRecursiveTo(FilePath.java:2109)
    at hudson.plugins.junitattachments.GetTestDataMethodObject.attachFilesForReport(GetTestDataMethodObject.java:121)
    at hudson.plugins.junitattachments.GetTestDataMethodObject.getAttachments(GetTestDataMethodObject.java:110)
    at hudson.plugins.junitattachments.AttachmentPublisher.contributeTestData(AttachmentPublisher.java:54)
    at hudson.plugins.junitattachments.AttachmentPublisher.contributeTestData(AttachmentPublisher.java:30)
    at hudson.tasks.junit.JUnitResultArchiver.perform(JUnitResultArchiver.java:183)
    at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)
    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
    at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)
    at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:720)
    at hudson.model.Build$BuildExecution.post2(Build.java:185)
    at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:665)
    at hudson.model.Run.execute(Run.java:1745)
    at hudson.matrix.MatrixRun.run(MatrixRun.java:146)
    at hudson.model.ResourceController.execute(ResourceController.java:98)
    at hudson.model.Executor.run(Executor.java:410)
Build step 'Veröffentliche JUnit-Testergebnisse.' marked build as failure

Jenkins version: 2.11
JUnit Plugin version: 1.18
py: 1.4.31
pluggy: 0.3.1
plugins: flake8-0.6, cov-2.3.1, remove-stale-bytecode-2.1
Python versions: 2.7 up to 3.5 and PyPy

Contents of pytest.ini:

[pytest]
addopts = src README.txt  --flake8

The generated junit.xml file differs in the following way:

pytest 2.9.2:

<testcase classname="" file="README.txt" name="README.txt" time="0.027095079422"></testcase>

pytest 3.0.x:

<testcase classname="README.txt" file="README.txt" name="README.txt" time="0.00580596923828"></testcase>

Aka the classname is no longer empty.

Start with the pytest.ini configuration and the generated junit.xml for a doctest, reproducing the output difference between pytest 2.9.2 and 3.0.x. Investigate the JUnit reporting path and verify that the resulting XML works with Jenkins' Publish JUnit test result report while preserving the doctest result.