_getCurrentTestCase = function() {
  'use strict';
  // Some users of goog.testing.asserts do not use goog.testing.TestRunner and
  // they do not include goog.testing.TestCase. Exceptions will not be
  // completely correct for these users.
  if (!goog.testing.TestCase) {
    if (goog.global.console) {
      goog.global.console.error(
          'Missing goog.testing.TestCase, ' +
          'add /* @suppress {extraRequire} */' +
          'goog.require(\'goog.testing.TestCase\')');
    }
    return null;
  }
  return goog.testing.TestCase.getActiveTestCase();
}
@return {?} goog.testing.TestCase or null
We suppress the lint error and we explicitly do not goog.require()
goog.testing.TestCase to avoid a build time dependency cycle.
@suppress {missingRequire|undefinedVars|missingProperties}
@private