Migrate the integration test description to Jest folder with standard.

[shuse2]

Description

While we migrate to the jest integration test, we need a solid standard of how to write the test description.

• Root level should have the description of scenario what the file is testing.
• Try to decrease the nesting test as much as possible (prefer 3 level of nesting: root - given - when)
• Use Given and When phrases on the description (except the root level)
• it phrase should be followed by should do xxx
• It should be readable and understandable just by reading the description
• It should not loose the old scenarios while migrating the description