Refactored Identifiers

[congyuluo]

Description

Refactored certain identifiers in the code - expanded certain variable names according to its usage in the code to make them more descriptive. Meanwhile, changed "testOffLine" to "testOffline" as "Offline" is a single word, to conform to Java naming conventions.

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here