You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: chunk_interval_list_test.go
    path of file: ./repos/seaweedfs/weed/mount/page_writer
    
    the code of the file until where you have to start completion: package page_writer

import (
	"github.com/stretchr/testify/assert"
	"testing"
)

func Test_PageChunkWrittenIntervalList(t *testing.T) {
	list := newChunkWrittenIntervalList()

	assert.Equal(t, 0, list.size(), "empty list")

	list.MarkWritten(0, 5, 1)
	assert.Equal(t, 1, list.size(), "one interval")

	list.MarkWritten(0, 5, 2)
	assert.Equal(t, 1, list.size(), "duplicated interval2")

	list.MarkWritten(95, 100, 3)
	assert.Equal(t, 2, list.size(), "two intervals")

	list.MarkWritten(50, 60, 4)
	assert.Equal(t, 3, list.size(), "three intervals")

	list.MarkWritten(50, 55, 5)
	assert.Equal(t, 4, list.size(), "three intervals merge")

	list.MarkWritten(40, 50, 6)
	assert.Equal
    
func Test_PageChunkWrittenIntervalList(t *testing.T) {
	list := newChunkWrittenIntervalList()

	assert.Equal(t, 0, list.size(), "empty list")

	list.MarkWritten(0, 5, 1)
	assert.Equal(t, 1, list.size(), "one interval")

	list.MarkWritten(0, 5, 2)
	assert.Equal(t, 1, list.size(), "duplicated interval2")

	list.MarkWritten(95, 100, 3)
	assert.Equal(t, 2, list.size(), "two intervals")

	list.MarkWritten(50, 60, 4)
	assert.Equal(t, 3, list.size(), "three intervals")

	list.MarkWritten(50, 55, 5)
	assert.Equal(t, 4, list.size(), "three intervals merge")

	list.MarkWritten(40, 50, 6)
	assert.Equal(t, 5, list.size(), "three intervals grow forward")

	list.MarkWritten(50, 65, 7)
	assert.Equal(t, 4, list.size(), "three intervals grow backward")

	list.MarkWritten(70, 80, 8)
	assert.Equal(t, 5, list.size(), "four intervals")

	list.MarkWritten(60, 70, 9)
	assert.Equal(t, 6, list.size(), "three intervals merged")

	list.MarkWritten(59, 71, 10)
	assert.Equal(t, 6, list.size(), "covered three intervals")

	list.MarkWritten(5, 59, 11)
	assert.Equal(t, 5, list.size(), "covered two intervals")

	list.MarkWritten(70, 99, 12)
	assert.Equal(t, 5, list.size(), "covered one intervals")

}