public ColumnConstraints getConstraints() {
    return constraints;
  }
@Test
  public void shouldReturnPrimaryKey() {
    // Given:
    final TableElement valueElement = new TableElement(NAME, new Type(SqlTypes.STRING),
        PRIMARY_KEY_CONSTRAINT);

    // Then:
    assertThat(valueElement.getConstraints(), is(PRIMARY_KEY_CONSTRAINT));
  }