java - How can I call Test class ctor with params? -

i have unit test class , static main entry method.

i know how run test class main method:

public class singlejunittestrunner {       public static void main(string... args) throws classnotfoundexception          {           string[] classandmethod = args[0].split("#");           request request = request.method(class.forname(classandmethod[0]), classandmethod[1]);           result result = new junitcore().run(request);           system.exit(result.wassuccessful() ? 0 : 1);      }  } 

is there way call test-calls ctor params , run tests?

i took @ junit source code , came this:

public static void main(string... args) throws classnotfoundexception {     string[] classandmethod = args[0].split("#");     object[] parameters = new object[] {"constructor parameter"};      class<?> classname = class.forname(classandmethod[0]);     string methodname = classandmethod[1];      request request = createrequest(parameters, classname, methodname);      result result = new junitcore().run(request);      system.exit(result.wassuccessful() ? 0 : 1); }  private static request createrequest(object[] parameters, class<?> classname, string methodname) {         description method = description.createtestdescription(classname, methodname);         return new constructorparameterrequest(classname, parameters).filterwith(method); } 

custom request class can use our own runner:

public class constructorparameterrequest extends request {      private class<?> clazz;     private object[] parameters;      public constructorparameterrequest(class<?> clazz, object[] parameters) {         this.clazz = clazz;         this.parameters = parameters;     }      @override     public runner getrunner() {         try {             return new constructorparameterrunner(clazz, parameters);         } catch (throwable e) {             return new errorreportingrunner(clazz, e);         }     }  } 

custom runner class creates test class constructor parameters. validateconstructor has overriden because blockjunit4classrunner checks 0 argument constructor:

public class constructorparameterrunner extends blockjunit4classrunner {      private object[] parameters;      public constructorparameterrunner(class<?> clazz, object[] parameters) throws initializationerror  {         super(clazz);         this.parameters = parameters;     }      @override     protected void validateconstructor(list<throwable> errors) {         validateonlyoneconstructor(errors);     }      @override     protected object createtest() throws exception {         return gettestclass().getonlyconstructor().newinstance(parameters);     }  }