return Io.get().chain(function(receiver) {
const results = [];
testcase = Io.of().chain(testcase);
for( let user_number = 0; user_number < concurrency; user_number++ )
results.push(testcase.run(receiver));
return Io.resolve(Promise.all(results));
});
return Io.get().chain(function(state) {
const result = testcase.run(state).catch(function(err) {
console.error(err);
if( state && state.receive )
state.receive(metrics.problem(err));
else {
// the entire purpose of this function was to report error metrics instead of throwing an error
// but apparently we don't have the ability to report any metrics at all . . . so . . . just burn everything
throw err;
}
});
return Io.resolve(result);
});