補unit test
補unit test
update
Merge remote-tracking branch 'origin/昱霖-test'

Conflicts:
	Large and Open Source Project/src/LnOS.java
	Large and Open Source Project/src/fileDownload.java

	modified:   Large and Open Source Project/src/LnOS.java
	modified:   Large and Open Source Project/src/fileDownload.java
	new file:   Large and Open Source Project/src/fileDownloadTest.java