export const tests = []
const t = (f) => tests.push(f)

t(() => Array.isArray(arr)) // arr is declared and is an array
t(({ eq }) => eq(arr[0], 4)) // arr first element is 4
t(({ eq }) => eq(arr[1], '2')) // arr second element is "2"
t(({ eq }) => eq(arr.length, 2)) // arr length is 2

Object.freeze(tests)