Fix the following errors:
59:35 error "options" is defined but never used no-unused-vars
91:11 error "plugin" is defined but never used no-unused-vars
102:35 error "options" is defined but never used no-unused-vars
128:35 error "options" is defined but never used no-unused-vars
Note that ESLint revealed a real problem where the test supposedly
verifying receiving options by a plugin didn't actually verify anything.