const samples = (state=[], action) => {
switch (action.type) {
case actionTypes.ADD_SAMPLE:
return uniq([...state, action.payload])
default:
return uniq(state)
}
}
it("Retains only unique items in an array.", () => {
expect(uniq([])).toEqual([])
expect(uniq([1])).toEqual([1])
expect(uniq([1, 2])).toEqual([1, 2])
expect(uniq([1, 1, 2])).toEqual([1, 2])
expect(uniq([1, 1, 2, 2, 3])).toEqual([1, 2, 3])
expect(uniq([1, 1, 1])).toEqual([1])
expect(uniq([{a:1}, {a:1}])).toEqual([{a:1}, {a:1}])
})
it("Returns the original array if items are already unique.", () => {
const arr = [1, 2, 3]
expect(uniq(arr)).toBe(arr)
})