Scala测试匹配某个字段上的case类

Question

case class Foo(field1: String, field2: String, field3: String)

expected: Seq[Foo] = Seq(...)

result: Seq[Foo] = Seq(...)

示例：

val expected = Seq(
  Foo(
    "f1", "f2", "f3"
  )
)

val result = Seq(
  Foo(
    "fx", "f2", "f3"
  )
)

这两个序列必须匹配。

  result should matchWithoutId(expected)

Answer 1

文档在使用自定义匹配器中，这个示例将是（例如）

def matchWithoutId(expected: Foo): Matcher[Foo] = Matcher { actual =>
  MatchResult(
    actual.field2 == expected.field2 && actual.field3 == expected.field3,
    if (actual.field2 != expected.field2)
      s"field2 of $actual was not equal to that of $expected"
    else
      s"field3 of $actual was not equal to that of $expected",
    s"field2 and field3 of $actual were equal to those of $expected")
}

根据口味调整错误消息。

或者另一种方法（在这种情况下可能是更好的方法）：

def matchWithoutId(expected: Foo): Matcher[Foo] = have(
  'field2 (expected.field2),
  'field3 (expected.field3)
)