1 files changed, 40 insertions, 0 deletions
diff --git a/weed/filesys/dirty_page_interval_test.go b/weed/filesys/dirty_page_interval_test.go
new file mode 100644
index 000000000..4f62f90c9
--- /dev/null
+++ b/weed/filesys/dirty_page_interval_test.go
@@ -0,0 +1,40 @@
+package filesys
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestContinuousIntervals_AddInterval(t *testing.T) {
+
+	c := &ContinuousIntervals{}
+
+	// 25, 25, 25
+	c.AddInterval(getBytes(25, 3), 0)
+	//  _,  _, 23, 23, 23, 23
+	c.AddInterval(getBytes(23, 4), 2)
+
+	expectedData(t, c, 0, 25, 25, 23, 23, 23, 23)
+}
+
+func expectedData(t *testing.T, c *ContinuousIntervals, offset int, data ...byte) {
+	start, stop := int64(offset), int64(offset+len(data))
+	for _, list := range c.lists {
+		nodeStart, nodeStop := max(start, list.Head.Offset), min(stop, list.Head.Offset+list.Size())
+		if nodeStart < nodeStop {
+			buf := make([]byte, nodeStop-nodeStart)
+			list.ReadData(buf, nodeStart, nodeStop)
+			if bytes.Compare(buf, data[nodeStart-start:nodeStop-start]) != 0 {
+				t.Errorf("expected %v actual %v", data[nodeStart-start:nodeStop-start], buf)
+			}
+		}
+	}
+}
+
+func getBytes(content byte, length int) []byte {
+	data := make([]byte, length)
+	for i := 0; i < length; i++ {
+		data[i] = content
+	}
+	return data
+}