junit中如何输出多个字符串
我有一个消息列表，我将其与给定的计数进行比较。当计数失败时，我想输出找到的所有消息，以便我知道哪条消息丢失或多余。目前我使用：
import scala.collection.JavaConversions._
def Assert_Messages (
expected : Int,
actual : java.util.List [String])
{
if (expected != 0 && actual.size == 0)
{
junit.framework.Assert.fail ("An expected error message was not reported.")
}
else if (expected != actual.size)
{
actual foreach (junit.framework.Assert.fail (_))
} // if
} // Assert_Messages
但这只会输出第一条消息，因为 junit.framework.Assert.fail 不会返回。有人给我一个不涉及丑陋的 StringBuffer 的想法吗？
JUnit 设置为测试必须在 Android 上运行。
感谢您的任何帮助。我期待着学习一些新的、有趣的东西。
I have a list of messages which I compare with a given count. When the count fails then I want to output all messages found so I know which message is missing or superfluous. Currently I use:
import scala.collection.JavaConversions._
def Assert_Messages (
expected : Int,
actual : java.util.List [String])
{
if (expected != 0 && actual.size == 0)
{
junit.framework.Assert.fail ("An expected error message was not reported.")
}
else if (expected != actual.size)
{
actual foreach (junit.framework.Assert.fail (_))
} // if
} // Assert_Messages
But this will only output the first message as junit.framework.Assert.fail does not return. Has anybody got an idea for me which does not involve an ugly StringBuffer?
JUnit is set as the test must run on Android.
Thanks for any help. I look forward to learning something new and nifty.
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您可以尝试
junit.framework.Assert.fail(actual.mkString("; "))。将"; "替换为您想要用作分隔符的任何内容；如果您希望能够重建原始字符串序列，请务必转义与分隔字符串冲突的字符，例如使用反斜杠或其他字符。一些旁注：
someCollection.size == 0，而是测试someCollection.isEmpty。在 ScalaList上，如果 n 是列表的大小，则size是 O(n) 运算； isEmpty 的复杂度为 O(1)。scala包中导入内容时，不需要显式编写scala.前缀（除非存在歧义），因此import collection.JavaConversions ._会做得很好。You can try
junit.framework.Assert.fail(actual.mkString("; ")). Replace"; "with whatever you want to use as separator; if you want to be able to reconstruct the original sequence of strings, be sure to escape characters that collide with your separating string, e.g. with a backslash or something.Some side remarks:
someCollection.size == 0, it is good practice to test forsomeCollection.isEmptyinstead. On a ScalaList,sizeis an O(n) operation if n is the size of your list;isEmptyis O(1).scala.prefix when you import stuff from within thescalapackage (unless there are ambiguities), soimport collection.JavaConversions._will do nicely.