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package memstream
import (
"strconv"
"testing"
"github.com/stretchr/testify/require"
)
func TestStream(t *testing.T) {
s := New()
const streamSize = 5
// Fill stream with values.
for i := 0; i < streamSize; i++ {
seq, err := s.Add([]byte(strconv.Itoa(i+1)), streamSize)
require.NoError(t, err)
require.Equal(t, uint64(i+1), seq)
}
require.Equal(t, 5, s.list.Len())
require.Equal(t, 5, len(s.index))
items, streamTop, err := s.Get(5, 3)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(5))
require.Equal(t, []Item{{5, []byte("5")}}, items)
items, streamTop, err = s.Get(5, 0)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(5))
require.Equal(t, []Item{{5, []byte("5")}}, items)
items, streamTop, err = s.Get(6, 2)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(5))
require.Nil(t, items)
items, streamTop, err = s.Get(7, 2)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(5))
require.Nil(t, items)
items, streamTop, err = s.Get(1, 2)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(5))
require.Equal(t, []Item{{1, []byte("1")}, {2, []byte("2")}}, items)
_, err = s.Add([]byte("6"), streamSize)
require.NoError(t, err)
items, streamTop, err = s.Get(1, 2)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(6))
require.Equal(t, []Item{{2, []byte("2")}, {3, []byte("3")}}, items)
items, streamTop, err = s.Get(2, 2)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(6))
require.Equal(t, []Item{{2, []byte("2")}, {3, []byte("3")}}, items)
items, streamTop, err = s.Get(5, 2)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(6))
require.Equal(t, []Item{{5, []byte("5")}, {6, []byte("6")}}, items)
_, err = s.Add([]byte("7"), streamSize)
require.NoError(t, err)
_, streamTop, err = s.Get(5, 2)
require.NoError(t, err)
require.Equal(t, streamTop, uint64(7))
require.Equal(t, 5, len(s.index))
s.Reset()
require.Equal(t, uint64(0), s.Top())
require.Equal(t, 0, len(s.index))
require.Equal(t, 0, s.list.Len())
_, err = s.Add([]byte("8"), streamSize)
require.NoError(t, err)
}
func TestStreamGetAll(t *testing.T) {
s := New()
items, streamTop, err := s.Get(0, 0)
require.NoError(t, err)
require.Equal(t, uint64(0), streamTop)
require.Nil(t, items)
_, err = s.Add([]byte("1"), 2)
require.NoError(t, err)
items, _, err = s.Get(0, 200)
require.NoError(t, err)
require.Len(t, items, 1)
}
func TestStreamClear(t *testing.T) {
s := New()
const streamSize = 5
_, err := s.Add([]byte("1"), streamSize)
require.NoError(t, err)
s.Clear()
require.NotZero(t, s.Top())
require.Equal(t, 0, len(s.index))
require.Equal(t, 0, s.list.Len())
}
func TestStreamReset(t *testing.T) {
s := New()
epoch := s.Epoch()
const streamSize = 5
_, err := s.Add([]byte("1"), streamSize)
require.NoError(t, err)
s.Reset()
require.Zero(t, s.Top())
require.Equal(t, 0, len(s.index))
require.Equal(t, 0, s.list.Len())
require.NotEqual(t, epoch, s.Epoch())
}
func TestStreamOffset(t *testing.T) {
s := New()
const streamSize = 5
for i := 0; i < streamSize; i++ {
_, err := s.Add([]byte("elem"), streamSize)
require.NoError(t, err)
}
items, _, err := s.Get(0, 1)
require.NoError(t, err)
require.Equal(t, uint64(1), items[0].Offset)
items, _, err = s.Get(1, 1)
require.NoError(t, err)
require.Equal(t, uint64(1), items[0].Offset)
items, _, err = s.Get(2, 1)
require.NoError(t, err)
require.Equal(t, uint64(2), items[0].Offset)
}
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