Closed
Description
minimized code
object Asserts {
def assertEquals(expected: Any, actual: Any): Unit = {
println(1)
assert(expected.equals(actual), s"expected $expected but got $actual")
}
def assertEquals(expected: Long, actual: Long): Unit = {
println(2)
assert(expected == actual, s"expected $expected but got $actual")
}
}
object Test {
def main(args: Array[String]): Unit = {
def foo(): Long = 42L
Asserts.assertEquals(42, foo()) // an Int and a Long
}
}observed behavior
The first overload, taking Anys, is selected over the second one.
1
Exception in thread "main" java.lang.AssertionError: assertion failed: expected 42 but got 42
at dotty.DottyPredef$.assertFail(DottyPredef.scala:17)
at Asserts$.assertEquals(hello.scala:4)
at Test$.main(hello.scala:17)
at Test.main(hello.scala)
expectation
Like in Scala 2, the second overload, taking Longs, should be selected, so that it prints:
2
note
The API of Asserts above is defined in JUnit; it cannot be changed.
workaround
We can work around the issue by making sure that both arguments truly are Longs:
object Test {
def main(args: Array[String]): Unit = {
def foo(): Long = 42L
Asserts.assertEquals(42L, foo()) // Long and Long
}
}