plusOrMinus strangeness

[ido]

@RunWith(classOf[JUnitRunner])
class PearsonSpecification extends FlatSpec with ShouldMatchers {

"test1" should "plusminus" in {
0.5 should equal (0.5 plusOrMinus 0.1)
}

"test2" should "plusminus" in {
0.5 should equal (0.5)
}
}

test2 passes but
for test1 I get:
org.scalatest.TestFailedException: 0.5 did not equal
DoubleTolerance(0.5,0.1)

Which I don't understand.
I use scalatest-1.0.1-for-scala-2.8.0.Beta1-SNAPSHOT

[Bill Venners]

Hi,

You must use plusOrMinus with "be" not "equal". "equal" always
compares for equality by invoking == on one object, passing in the
other. "be" does different things depending on what object is being
passed. So try:

0.5 must be (0.5 plusOrMinus 0.1)

Bill

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