error

/usr/local/Cellar/nim/1.0.0/nim/lib/pure/unittest.nim(631, 43) Error: type mismatch: got <array[0..-1, empty], int literal(1)>
but expected one of: 
proc binarySearch[T, K](a: openArray[T]; key: K;
                      cmp: proc (x: T; y: K): int {.closure.}): int
  first type mismatch at position: 3
  missing parameter: cmp
proc binarySearch[T](a: openArray[T]; key: T): int
  first type mismatch at position: 2
  required type for key: T
  but expression '1' is of type: int literal(1)

expression: binarySearch([], 1)

test.nim

import unittest
import algorithm

suite "Binary Search":
  test "not found":
    check binarySearch([], 1) == -1