registrationError when including project and bower_components elements

[pengying]

I'm getting

chrome 45                ✖ Test Suite Initialization
  Failed to execute 'registerElement' on 'Document': Registration failed for type 'dom-module'. A type with that name is already registered.
    <unknown> at   <unknown> at /components/polymer-starter-kit/app/bower_components/polymer/polymer-micro.html:263:0
    <unknown> at   <unknown> at /components/polymer-starter-kit/app/bower_components/polymer/polymer-micro.html:273:0

When including elements from the local project elements directory and bower_components

  <link rel="import" href="../../bower_components/paper-dialog/paper-dialog.html">
  <!-- Import the element to test -->
  <link rel="import" href="../elements/my-greeting/my-greeting.html">

To repro: clone polymer-start-kit bower install PolymerElements/paper-dialog include paper dialog in tests/my-greeting-basic.html start test and get error

[jbastow]

@pengying I found a work around for now, seems to be a problem with the bower web-component-tester package. I'm using the yeoman polymer-generator, but it is also based off polymer-starter-kit so it should apply here. Make sure npm install has been run to get web-component-tester from npm.

In all the test files in the test/ directory e.g. tests/my-greeting-basic.html, change the script import for web-component tester to reference from node_modules instead of bower_components:

Find:

  <script src="../../bower_components/web-component-tester/browser.js"></script>

and change to:

  <script src="../../node_modules/web-component-tester/browser.js"></script>

Does the problem still persist after that? If so, could it to do with importing paper-dialog in the tests/my-greeting-basic.html file directly instead of as an import inside of elements/my-greeting/my-greeting.html?

[pengying]

Yeah the problem still occurs. I diffed the two browser.js and they're the same for me.

[andyfinity]

@pengying, I experienced a very similar problem to yours. Specifically, my errors looked like this for Chrome (but not Firefox):

chrome 46                ✖ Test Suite Initialization
  Failed to execute 'registerElement' on 'Document': Registration failed for type 'test-fixture'. A type with that name is already registered.
    <unknown> at   <unknown> at /components/demo-web-app/bower_components/test-fixture/test-fixture.html:312:0
    <unknown> at   <unknown> at /components/demo-web-app/bower_components/test-fixture/test-fixture.html:315:0

My workaround was to comment out the import to test-fixture.html in my tests. It seems as though they're already imported somewhere and the deduplication of imports isn't being done properly. Perhaps you are importing polymer-micro.html somewhere in your tests?

Strangely enough, Firefox worked fine. It's just Chrome that was complaining. Something something shadow DOM, perhaps? Beats me...

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.