Create tests for trailing comma on arguments list

src/arguments/default/cls-decl-gen-meth-static.template

src/arguments/default/cls-decl-gen-meth.template

src/arguments/default/cls-decl-meth-static.template

src/arguments/default/cls-decl-meth.template

src/arguments/default/cls-expr-gen-meth-static.template

src/arguments/default/cls-expr-gen-meth.template

src/arguments/default/cls-expr-meth-static.template

src/arguments/default/cls-expr-meth.template

src/arguments/default/func-decl.template

src/arguments/default/func-expr.template

src/arguments/default/gen-func-decl.template

src/arguments/default/gen-func-expr.template

src/arguments/default/gen-meth.template

src/arguments/default/meth.template

src/arguments/trailing-comma-multiple-args.case

src/arguments/trailing-comma-null.case

src/arguments/trailing-comma-single-args.case

src/arguments/trailing-comma-undefined.case