speedskater / babel-plugin-require-coverage

Demonstration of babel-plugin-require coverage bug

babel-plugin-require coverage bug

Case 1: plugin off

npm run coverage
# or with retainLines: true
BABEL_ENV=lines npm run coverage

# Result on both cases
-----------|----------|----------|----------|----------|----------------|
File       |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
-----------|----------|----------|----------|----------|----------------|
  index.js |      100 |      100 |      100 |      100 |                |
-----------|----------|----------|----------|----------|----------------|

Case 2: retainLines: false / plugin enabled

Coverage reports an additional branch not tested:

BABEL_ENV=plugin npm run coverage

# Result
-----------|----------|----------|----------|----------|----------------|
File       |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
-----------|----------|----------|----------|----------|----------------|
  index.js |      100 |       50 |      100 |      100 |                |
-----------|----------|----------|----------|----------|----------------|

Case 3: retainLines: true / plugin enabled

Situation is even worse. Coverage says there are statements, branches and functions not tested.

BABEL_ENV=linesplugin npm run coverage

-----------|----------|----------|----------|----------|----------------|
File       |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
-----------|----------|----------|----------|----------|----------------|
  index.js |    65.28 |       32 |     37.5 |      100 |                |
-----------|----------|----------|----------|----------|----------------|