st-fixture>

  <test-fixture id="auto-validate-numbers">
    <template>
      <paper-input-container auto-validate>
        <label id="l">label</label>
        <input is="iron-input" id="i" pattern="[0-9]*">
      </paper-input-container>
    </template>
  </test-fixture>

  <test-fixture id="manual-validate-numbers">
    <template>
      <paper-input-container>
        <label id="l">label</label>
        <input is="iron-input" id="i" pattern="[0-9]*">
      </paper-input-container>
    </template>
  </test