Currently, ReactEventListener is a DOM-specific module but it has a generic sounding name that is confusing to contributors (i.e., confusing to me).

Let's rename it to ReactDOMEventListener. This should be pretty easy – just rename the file and update (and re-sort) the imports.

# @philipp-spiess is working on this task.
* and returns that one result, or throws exception if there is any other
   * number of matches besides one.
   * @return {!ReactDOMComponent} The one match.
   */
  findRenderedDOMComponentWithTag: function(root, tagName) {
    var all = ReactTestUtils.scryRenderedDOMComponentsWithTag(root, tagName);
    if (all.length !== 1) {
      throw new Error(
        'Did not find exactly one match (found: ' +
          all.length +
          ') ' +
          'for tag:' +
          tagName,
      );
    }
    return all[0];
  },
  /**
   * Finds all instances of components with type equal to `componentType`.
   * @return {array} an array of all the matches.
   */
  scryRenderedComponentsWithType: function(root, componentType) {
    return ReactTestUtils.findAllInRenderedTree(root, function(inst) {
      return ReactTestUtils.isCompositeComponentWithType(inst, componentType);
    });
  },
  /**
   * Same as `scryRenderedComponentsWithType` but expects there to be one result
   * and returns that one result, or throws exception if there is any other
   * number of matches besides one.