public CreateTableBuilder withPkConstraintName(String pkConstraintName) {
    this.pkConstraintName = validateConstraintName(pkConstraintName);
    return this;
  }
@Test
  public void withPkConstraintName_throws_NPE_if_name_is_null() {
    assertThatThrownBy(() -> underTest.withPkConstraintName(null))
      .isInstanceOf(NullPointerException.class)
      .hasMessageContaining("Constraint name can't be null");
  }