Fixed a bad test case in rush_test.go
Fixed a bad test case in rush_test.go

Signed-off-by: Thien Hoang <630346a507a081f1a4ac97b9060ff924964b4b03@google.com>

hugelgupf/u-root,rminnich/u-root,GanShun/u-root,u-root/u-root,rminnich/u-root,GanShun/u-root,GanShun/u-root,rminnich/u-root,hugelgupf/u-root,hugelgupf/u-root,u-root/u-root,u-root/u-root,hugelgupf/u-root,rminnich/u-root