How to show custom failure message in Specs2 (Scala)?

问题

For example, for code like this:

myNum must beEqualTo("SOME INTERESTING TEXT")

The message will be like the following:

java.lang.Exception: ArrayBuffer() doesn't have size 1 but size 0

Is there an elegant way to get customised message displayed here?

回答1:

First you can name value you're testing.

myNum aka "meaningful name" must_== expectedValue

You can also overwrite the full message.

(myNum must_== expectedValue).setMessage("Full failure message")

来源：https://stackoverflow.com/questions/25351312/how-to-show-custom-failure-message-in-specs2-scala