This extension is used to insert test case by fetching it from text file so that in multiple checking case user doesn't have to input test case again.
From command pallete, context menu or shortcut one can directly fetch the test case.
vscode version >= 1.44.0
1 - Make text file with name (test.txt).
2 - Save your test case in that text file.
3 - Write your code in main file and execute, to get test case use Run Testcase from context menu or use shortcut (ctrl+f1) or command Run Testcase.
for eg:
Main file - sum.cpp
Test case file - test.txt
Call command when in main file. This extension takes text(test case) from .txt file and insert in the vscode terminal.
Snapshot
