assertTrySelectAccount(opt_localAccounts, opt_callbackUrl) {
    assertTrue(this.selectTried_);
    if (opt_localAccounts) {
      assertArrayEquals(opt_localAccounts, this.localAccounts_);
    } else {
      assertTrue(this.localAccounts_ == null);
    }
    if (opt_callbackUrl) {
      assertEquals(opt_callbackUrl, this.callbackUrl_);
    } else {
      assertTrue(this.callbackUrl_ == null);
    }
  }
Asserts the client has tried to select an account from accountchooser.com.
@param {?Array<!Account>=} opt_localAccounts Local account
    list.
@param {string=} opt_callbackUrl The URL to return to when the flow
    finishes. The default is current URL.