Enable strict mode in tests
Remove semicolons in tests
Change == and != to === and !==
Use single quotes for strings
Escape special characters
Add spaces around infix operators
Clean up unused variables and unhandled errors
Put curly braces around all if statements
process.exit() is fine in tests
Don't use + to concatenate paths
Don't redeclare existing variables
Make return statements consistent
Remove dangling commas
Don't make functions within a loop
Enable linting tests directory
Merge pull request #1179 from nylen/lint-tests-dir

Lint tests directory