Added tests for a numeric flag like -3
Added tests for a numeric flag like -3

cmars/tools,cmars/tools,abates/go-flags,fuchsia-mirror/third_party-github.com-jessevdk-go-flags,fuchsia-mirror/third_party-github.com-jessevdk-go-flags,cmars/tools,sourcegraph/go-flags,sourcegraph/go-flags,abates/go-flags,jessevdk/go-flags,cmars/tools,jessevdk/go-flags