diff --git a/pkg/types/rbtorderbook_test.go b/pkg/types/rbtorderbook_test.go
new file mode 100644
index 000000000..b58b55601
--- /dev/null
+++ b/pkg/types/rbtorderbook_test.go
@@ -0,0 +1,78 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/c9s/bbgo/pkg/fixedpoint"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRBOrderBook_EmptyBook(t *testing.T) {
+	book := NewRBOrderBook("BTCUSDT")
+	bid, ok := book.BestBid()
+	assert.False(t, ok)
+	assert.Equal(t, fixedpoint.Value(0), bid.Price)
+
+	ask, ok := book.BestAsk()
+	assert.False(t, ok)
+	assert.Equal(t, fixedpoint.Value(0), ask.Price)
+}
+
+func TestRBOrderBook_Load(t *testing.T) {
+	book := NewRBOrderBook("BTCUSDT")
+
+	book.Load(SliceOrderBook{
+		Symbol: "BTCUSDT",
+		Bids: PriceVolumeSlice{
+			{Price: fixedpoint.NewFromFloat(2800.0), Volume: fixedpoint.NewFromFloat(1.0)},
+		},
+		Asks: PriceVolumeSlice{
+			{Price: fixedpoint.NewFromFloat(2810.0), Volume: fixedpoint.NewFromFloat(1.0)},
+		},
+	})
+
+	bid, ok := book.BestBid()
+	assert.True(t, ok)
+	assert.Equal(t, fixedpoint.NewFromFloat(2800.0), bid.Price)
+
+	ask, ok := book.BestAsk()
+	assert.True(t, ok)
+	assert.Equal(t, fixedpoint.NewFromFloat(2810.0), ask.Price)
+}
+
+func TestRBOrderBook_LoadAndDelete(t *testing.T) {
+	book := NewRBOrderBook("BTCUSDT")
+
+	book.Load(SliceOrderBook{
+		Symbol: "BTCUSDT",
+		Bids: PriceVolumeSlice{
+			{Price: fixedpoint.NewFromFloat(2800.0), Volume: fixedpoint.NewFromFloat(1.0)},
+		},
+		Asks: PriceVolumeSlice{
+			{Price: fixedpoint.NewFromFloat(2810.0), Volume: fixedpoint.NewFromFloat(1.0)},
+		},
+	})
+
+	bid, ok := book.BestBid()
+	assert.True(t, ok)
+	assert.Equal(t, fixedpoint.NewFromFloat(2800.0), bid.Price)
+
+	ask, ok := book.BestAsk()
+	assert.True(t, ok)
+	assert.Equal(t, fixedpoint.NewFromFloat(2810.0), ask.Price)
+
+	book.Load(SliceOrderBook{
+		Symbol: "BTCUSDT",
+		Bids: PriceVolumeSlice{
+			{Price: fixedpoint.NewFromFloat(2800.0), Volume: 0},
+		},
+		Asks: PriceVolumeSlice{
+			{Price: fixedpoint.NewFromFloat(2810.0), Volume: 0},
+		},
+	})
+
+	bid, ok = book.BestBid()
+	assert.False(t, ok)
+	ask, ok = book.BestAsk()
+	assert.False(t, ok)
+}