Android Unit Testing with JUNIT Framework -

i have started unit testing in android

placed test folder under src path /src/test.

my /src/main/java/com/example/prabhu/mathapplication consists of activities , java classes.

i want run test check wether method gets executed or doesn't unable resolve error understanding due not finding link.so while writing tests how resolve , how use mocks this.

my test code :

    /**  * created prabhu on 12/05/15.  */      import com.example.prabhu.mathapplication.calcnative;     import com.example.prabhu.mathapplication.mainactivity;      import junit.framework.testcase;      import org.junit.after;     import org.junit.before;     import org.junit.*;  public class myaddertest extends testcase {     private mainactivity mmyadder;    // private calcnative do_calculation_in_native;      int x,y;      @before     public void setup() throws exception {         // code wish run before each test         mmyadder = new mainactivity();        // do_calculation_in_native = new calcnative();         x=2;         y=3;      }      @after     public void teardown() throws exception {         // code wish run after each test     }      @test     public void testadd() {         mmyadder.iterate_java(9999,9999,9999);        // boolean x = do_calculation_in_native.perform_calculations(1234,1234,1234);         int z = x+y;         assertequals(z,5);        // assertequals(true,x);     }  } 

i don't errors if comment out lines containing class , test cases work ...

the error :

java.lang.unsatisfiedlinkerror: no calcnative in java.library.path @ java.lang.classloader.loadlibrary(classloader.java:1857) @ java.lang.runtime.loadlibrary0(runtime.java:870) @ java.lang.system.loadlibrary(system.java:1119) @ com.example.prabhu.mathapplication.mainactivity.<clinit>(mainactivity.java:118) @ myaddertest.setup(myaddertest.java:22) @ org.junit.internal.runners.junit38classrunner.run(junit38classrunner.java:86) @ org.junit.runner.junitcore.run(junitcore.java:137) @ com.intellij.junit4.junit4ideatestrunner.startrunnerwithargs(junit4ideatestrunner.java:78) @ com.intellij.rt.execution.junit.junitstarter.preparestreamsandstart(junitstarter.java:212) @ com.intellij.rt.execution.junit.junitstarter.main(junitstarter.java:68) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) @ com.intellij.rt.execution.application.appmain.main(appmain.java:140) 

my project structure below :

the mainactivity.java follows :

    package com.example.prabhu.mathapplication;  import android.app.activitymanager; import android.content.intent; import android.support.v7.app.actionbaractivity; import android.os.bundle; import android.view.menu; import android.view.menuitem; import android.view.view; import android.widget.button; import android.widget.edittext; import android.widget.radiobutton; import android.widget.textview;   public class mainactivity extends actionbaractivity {      radiobutton jni_radio,java_radio;     edittext number1,number2,iterate;     int input_number1,input_number_2,iterator,increment;     boolean check_operations;     textview add_number,diff_between,product_of,divided_by;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         jni_radio = (radiobutton)findviewbyid(r.id.radiobutton);         java_radio = (radiobutton)findviewbyid(r.id.radiobutton2);                  number1 =(edittext)findviewbyid(r.id.edittext);                 number2 = (edittext)findviewbyid(r.id.edittext2);                 iterate = (edittext)findviewbyid(r.id.edittext3);                  try                 {                     input_number1 = integer.parseint(number1.gettext()+"");                     input_number_2 = integer.parseint(number2.gettext()+"");                     iterator = integer.parseint(iterate.gettext()+"");                 }catch (exception e)                 {                  }                   if(java_radio.ischecked())                 {                     iterate_java(input_number1,input_number_2,iterator);                 }                 else if(jni_radio.ischecked())                 {                     check_operations = (boolean) calcnative.perform_calculations(input_number1,input_number_2,iterator);                 }     }       public static void iterate_java(int input_number1,int input_number_2,int iterator)     {         for(int increment = 0;increment<iterator;increment++)         {             int l = input_number1+input_number_2;             int j = input_number1-input_number_2;             int k  = (input_number1*input_number_2);             int = input_number1/input_number_2;         }     }      static     {         system.loadlibrary("calcnative");     } 

modify code below :

   try {         system.loadlibrary("calcnative");                } catch (unsatisfiedlinkerror e) {         // todo: handle exception     } 

explanation : test framework not support yet loadlib functions hence apis jni etc not work android test framework. above try-catch block wont harm ur code in anyway escape when run test-cases.