Function TestBitmapContainerReverseIterator

bitmapcontainer_test.go:98–163

RunReverseIterator16 unit tests for cur, next, hasNext, and remove should pass

(t *testing.T)

// RunReverseIterator16 unit tests for cur, next, hasNext, and remove should pass
func TestBitmapContainerReverseIterator(t *testing.T) {
	t.Run("reverse iterator on the empty container", func(t *testing.T) {
		bc := newBitmapContainer()
		it := bc.getReverseIterator()

		assert.False(t, it.hasNext())
		assert.Panics(t, func() { it.next() })
	})

	t.Run("reverse iterator on the container with range(0,0)", func(t *testing.T) {
		bc := newBitmapContainerwithRange(0, 0)
		it := bc.getReverseIterator()

		assert.True(t, it.hasNext())
		assert.EqualValues(t, 0, it.next())
	})

	t.Run("reverse iterator on the container with range(4,4)", func(t *testing.T) {
		bc := newBitmapContainerwithRange(4, 4)
		it := bc.getReverseIterator()

		assert.True(t, it.hasNext())
		assert.EqualValues(t, 4, it.next())
	})

	t.Run("reverse iterator on the container with range(4,9)", func(t *testing.T) {
		bc := newBitmapContainerwithRange(4, 9)
		it := bc.getReverseIterator()

		assert.True(t, it.hasNext())

		for i := 9; i >= 4; i-- {
			assert.EqualValues(t, i, it.next())

			if i > 4 {
				assert.True(t, it.hasNext())
			} else if i == 4 {
				assert.False(t, it.hasNext())
			}
		}

		assert.False(t, it.hasNext())
		assert.Panics(t, func() { it.next() })
	})

	t.Run("reverse iterator on the container with values", func(t *testing.T) {
		values := []uint16{0, 2, 15, 16, 31, 32, 33, 9999, MaxUint16}
		bc := newBitmapContainer()

		for n := 0; n < len(values); n++ {
			bc.iadd(values[n])
		}

		it := bc.getReverseIterator()
		n := len(values)

		assert.True(t, it.hasNext())