How to I write a Specs2 matcher for "a,b,c".containsAllOf("b","a")?

Question

I'm new to the Scala/Play 2.1/Specs2 stack, so please excuse me if this question seems simpleton, but I am having difficulty writing a spec to test the case of "String contains the word 'GET'". I've got a Play 2.1 Action that returns an Access-Control-Allow-Methods header value like

Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS

My Spec has no problem doing straight equality checks on other headers, but I have been unable to figure out how to check the Access-Control-Allow-Methods header for each of GET, PUT, POST, DELETE, and OPTIONS. I've expected something like "must contains("GET") to work but the IDE goes red on this with some:

type mismatch;  found   : org.specs2.matcher.ContainMatcher[String]  required: org.specs2.matcher.Matcher[Option[String]]   SessionsSpec.scala  /dm2-server/test/admin  line 53 Scala Problem

My spec looks like...

"send 200 on OPTIONS request on valid route" in {
  running(FakeApplication()) {
    var fakeReq = FakeRequest("OPTIONS", "/admin/sessions")
    val Some(result) = route(fakeReq)
    status(result) must equalTo(OK)
    header(ACCESS_CONTROL_ALLOW_ORIGIN, result) must equalTo(Some("*"))
    header(ACCESS_CONTROL_ALLOW_HEADERS, result) must equalTo(Some(CONTENT_TYPE))
    val expectedMethods = Seq(GET, PUT, POST, DELETE, "OPTIONS")
    header(ACCESS_CONTROL_ALLOW_METHODS, result) must containAllOf(expectedMethods)
  }
}

How do I express the use case of "does this string contain all of these values" in Specs2?

Answer 1

Here's something similar to what you are trying to accomplish:

"A split option string " should{
  "be able to be verified with a containsAllOf matcher" in {
    val headerVal = Some("a, b, c, d, e")
    val expected = Seq("a", "e")

    headerVal must beSome
    headerVal.get.split(", ").toSeq must containAllOf(expected)
  }
}

The issue was that you were trying to take an Option[String] and use that in a Traversable matcher against a Seq. To make that kind of comparison work, both items need to be Traversable. To get to that point, I first make a check on the Option to make sure it's a Some. I then get it and split it on the comma and turn that into a Seq. Once both pieces are Traversable, you can use that containAllOf matcher.