public void write(RowMutation tableRow) throws BigtableResourceManagerException {
    write(ImmutableList.of(tableRow));
  }
@Test
  public void testWriteShouldThrowErrorWhenInstanceDoesNotExist() {
    assertThrows(
        IllegalStateException.class,
        () -> testManager.write(RowMutation.create(TABLE_ID, "sample-key")));
    assertThrows(
        IllegalStateException.class,
        () -> testManager.write(ImmutableList.of(RowMutation.create(TABLE_ID, "sample-key"))));
  }