nim-dagger/tests/codex/utils/testoptionalcast.nim

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import std/unittest
import codex/utils/optionalcast
suite "optional casts":
test "casting value to same type works":
check 42 as int == some 42
test "casting value to unrelated type evaluates to None":
check 42 as string == string.none
test "casting value to subtype works":
type
BaseType = ref object of RootObj
SubType = ref object of BaseType
let x: BaseType = SubType()
check x as SubType == SubType(x).some
test "casting to unrelated subtype evaluates to None":
type
BaseType = ref object of RootObj
SubType = ref object of BaseType
OtherType = ref object of BaseType
let x: BaseType = SubType()
check x as OtherType == OtherType.none
test "casting works on optional types":
check 42.some as int == some 42
check 42.some as string == string.none
check int.none as int == int.none