add rxcppv2_test target
add rxcppv2_test target

ReactiveX/RxCpp,alexeymarkov/RxCpp,alexeymarkov/RxCpp,Reactive-Extensions/RxCpp,Reactive-Extensions/RxCpp,Reactive-Extensions/RxCpp,ReactiveX/RxCpp,alexeymarkov/RxCpp,ReactiveX/RxCpp