private void addSomeRecordsWithNullIssuer() {
    for (TestAccount t : TEST_ACCOUNTS_WITH_NULL_ISSUER) {
      addTestAccount(t);
    }
  }
Note: caller should carefully determine the expected value of {@code isGoogleAccount}, which
is affected by multiple factors.

@param isGoogleAccount is a {@code boolean}, not a {@link Boolean}
javatests/com/google/android/apps/authenticator/otp/AccountDbTest.java