Simple单元测试简单单元测试

Question

假设我测试功能echo: String => String，它只是重复输入，与specs2。

我可以写一个这样的几个测试：

class EchoSpec extends SpecificationWithJUnit { 

    "echo should handle ASCII alphanumeric names" in { 
    echo("abc") must beEqualTo("abc") 
    } 

    "echo should handle names with slashes" in { 
    echo("a/b/c") must beEqualTo("a/b/c") 
    } 

    "echo should handle names with dots" in { 
    echo("a.b.c") must beEqualTo("a.b.c") 
    } 

    "echo should handle non-ASCII names" in { 
    echo("אבג") must beEqualTo("אבג") 
    } 
} 

不过我更愿意摆脱样板代码。所以我使用cats monoids：

import cats.implicits._ 

def testEcho(expected: String): String => Option[String] = {str => 
    if (str == expected) none else s"$str != expected".some 
} 

def testEchoes(expected: List[String]): Option[String] = 
    expected foldMap testEcho map (_.mkString(", ")) 

"echo should handle all names" { 
    val expected = List("abc", "a/b/c", "a.b.c", "אבג") 
    testEcho(expected) must beNone 
} 

它有道理吗？如何改进/简化它？ 幺半群在这里真的有必要吗？如果没有幺半群，我可以摆脱上面的样板代码吗？

Answer 1

List("abc", "a/b/c", "a.b.c", "אבג") 
    .foreach(s => echo(s) must beEqualTo(s)) 

Answer 2

您还可以使用ScalaCheck

class EchoSpec extends SpecificationWithJUnit with ScalaCheck { 
    "echo should handle all names" >> prop { s: String => 
    echo(s) must beEqualTo(s) 
    } 
}