Function TestMap

iter/map_test.go:23–80

(t *testing.T)

}

func TestMap(t *testing.T) {
	t.Parallel()

	t.Run("empty", func(t *testing.T) {
		t.Parallel()
		f := func() {
			ints := []int{}
			Map(ints, func(val *int) int {
				panic("this should never be called")
			})
		}
		require.NotPanics(t, f)
	})

	t.Run("panic is propagated", func(t *testing.T) {
		t.Parallel()
		f := func() {
			ints := []int{1}
			Map(ints, func(val *int) int {
				panic("super bad thing happened")
			})
		}
		require.Panics(t, f)
	})

	t.Run("mutating inputs is fine, though not recommended", func(t *testing.T) {
		t.Parallel()
		ints := []int{1, 2, 3, 4, 5}
		Map(ints, func(val *int) int {
			*val += 1
			return 0
		})
		require.Equal(t, []int{2, 3, 4, 5, 6}, ints)
	})

	t.Run("basic increment", func(t *testing.T) {
		t.Parallel()
		ints := []int{1, 2, 3, 4, 5}
		res := Map(ints, func(val *int) int {
			return *val + 1
		})
		require.Equal(t, []int{2, 3, 4, 5, 6}, res)
		require.Equal(t, []int{1, 2, 3, 4, 5}, ints)
	})

	t.Run("huge inputs", func(t *testing.T) {
		t.Parallel()
		ints := make([]int, 10000)
		res := Map(ints, func(val *int) int {
			return 1
		})
		expected := make([]int, 10000)
		for i := 0; i < 10000; i++ {
			expected[i] = 1
		}
		require.Equal(t, expected, res)
	})
}