Problem writing HaveMatcher on scala.xml.Node
Matt
attribute on an XML node. Specifically, I want this so that when the
test fails, I can see the text of the entire node, rather than
"expected true, got false".
Following the example from http://www.scalatest.org/scaladoc/1.7.2/#org.scalatest.matchers.HavePropertyMatcher
I have:
[code]
import org.scalatest.matchers._
import org.scalatest._
import scala.xml.Node
trait NodeHaveMatchers {
def completeStatus(expectedValue: Boolean):
HavePropertyMatcher[Node, Boolean] = {
new HavePropertyMatcher[Node, Boolean] {
def apply(node: Node) = {
HavePropertyMatchResult(
(node \ "@complete").toString.toBoolean == expectedValue,
"complete",
expectedValue,
(node \ "@complete").toString.toBoolean
)
}
}
}
}
class NodeSpec extends Spec with ShouldMatchers with NodeHaveMatchers
{
describe("A node") {
it("should have the complete status") {
val summary: Node = <summary complete="true" />
summary should have (
completeStatus (true),
)
}
}
}
[code]
The trait compiles fine, but when I can't get the call site to
compile. Any direction would be very helpful, thanks.
error: overloaded method value should with alternatives:
[ERROR] (beWord:
NodeSpec.this.BeWord)NodeSpec.this.ResultOfBeWordForAnyRef[Seq[scala.xml.Node]]
<and>
[ERROR] (notWord:
NodeSpec.this.NotWord)NodeSpec.this.ResultOfNotWordForAnyRef[Seq[scala.xml.Node]]
<and>
[ERROR] (haveWord:
NodeSpec.this.HaveWord)NodeSpec.this.ResultOfHaveWordForSeq[scala.xml.Node]
<and>
[ERROR] (rightMatcher:
org.scalatest.matchers.Matcher[Seq[scala.xml.Node]])Unit
[ERROR] cannot be applied to
(org.scalatest.matchers.Matcher[scala.xml.Node])
[ERROR] summary should have (completeStatus (true))
Bill Venners
The problem here is that a Node is a Seq[Node], so it is looking on
ResultOfHaveWordForSeq[Node] instead of Have on AnyRef, because that
implicit is more specific. Or something like that. Having Node be a
Seq[Node] is a very questionable design choice, but to deal with it
you need to say Seq[Node] not Node when you make the
HavePropertyMatcher. This compiles:
import org.scalatest.matchers._
import org.scalatest._
import scala.xml.Node
trait NodeHaveMatchers {
def completeStatus(expectedValue: Boolean):
HavePropertyMatcher[Seq[Node], Boolean] = {
new HavePropertyMatcher[Seq[Node], Boolean] {
def apply(node: Seq[Node]) = {
HavePropertyMatchResult(
(node \ "@complete").toString.toBoolean == expectedValue,
"complete",
expectedValue,
(node \ "@complete").toString.toBoolean
)
}
}
}
}
class NodeSpec extends Spec with ShouldMatchers with NodeHaveMatchers {
describe("A node") {
it("should have the complete status") {
val summary: Node = <summary complete="true" />
summary should have (
completeStatus (true)
)
}
}
}
And runs too:
scala> import org.scalatest._
import org.scalatest._
scala> run(new NodeSpec)
NodeSpec:
A node
- should have the complete status
I'll think about whether I could do anything to make this smoother.
Bill
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