Improve test coverage of /routes/index.js (#25)
Improve test coverage of /routes/index.js (#25)

- add logout tests
- coverage for /routes/index.js is increased 82.5% -> 100%

Signed-off-by: KwangHyuk Kim <b1801edc8b4b8c4218294fe97cfce980cbec2621@samsung.com>
Kwanghyuk-Kim/WATT,HunseopJeong/WATT,ws29jung/WATT,Jw00/WATT,Jw00/WATT,hyundukkim/WATT,Jw00/WATT,Kwanghyuk-Kim/WATT,Kwanghyuk-Kim/WATT,HunseopJeong/WATT,ws29jung/WATT,HunseopJeong/WATT,hyundukkim/WATT,HunseopJeong/WATT,HunseopJeong/WATT,HunseopJeong/WATT,hyundukkim/WATT,Kwanghyuk-Kim/WATT,ws29jung/WATT,Jw00/WATT,hyundukkim/WATT,ws29jung/WATT