java - How do I set a primitive private static final field in a class with private constructor using PowerMockito? -

i'm trying set private static final field in class private constructor junit test. when boil code down basics, following:

public class foo {     private static final boolean flag = false;     private foo() { /* don't call me */  }     public static boolean get() { return flag; } } 

my tests looks this:

@runwith(powermockrunner.class) @prepareeverythingfortest  // whitebox fails without line public class footest {     @test     public void testget() {         whitebox.setinternalstate(foo.class, "flag", true);         asserttrue(foo.get());     } } 

and here excerpt pom file:

<junit.version>4.11</junit.version> <powermock.version>1.5.4</powermock.version> <mockito.version>1.9.5</mockito.version> 

when put breakpoint on return flag;, can see flag set true in intellij's debugger. yet test fails assertionerror.

any ideas make work?

update: using reflection doesn't seem work, either:

@test public void testget_usingreflection() throws exception {     setfield(whitebox.invokeconstructor(foo.class), "flag", true);     asserttrue(foo.get()); }  public static void setfield(object targetobject, string fieldname, object value) throws nosuchfieldexception, illegalaccessexception {     class clazz =  targetobject.getclass();     field field = clazz.getdeclaredfield(fieldname);     field.setaccessible(true);     field modifiers = field.class.getdeclaredfield("modifiers");     modifiers.setaccessible(true);     modifiers.setint(field, field.getmodifiers() & ~modifier.final);     field.set(targetobject, value); } 

the setfield() method 1 have available through internal library. unfortunately, produces same result: assertionerror

update 2: getting rid of powermock doesn't much, either, apparently:

@test public void testget_usingreflectionwithoutpowermock() throws exception {     setfield(foo.class.getdeclaredfield("flag"), true);     asserttrue(foo.get()); }  public static void setfield(field field, object value) throws nosuchfieldexception, illegalaccessexception {     field.setaccessible(true);     field modifiers = field.class.getdeclaredfield("modifiers");     modifiers.setaccessible(true);     modifiers.setint(field, field.getmodifiers() & ~modifier.final);     field.set(null, value); } 

for this, removed powermock annotations class level...

i've posted question powermock mailing list now.

i had similar thing test, difference static final variable object rather primitive type. , indeed changing boolean boolean makes work.

public class foo {     private static final boolean flag = false;     private foo() { /* don't call me */  }     public static boolean get() { return flag; } } 

also recommend using @preparefortest(someclass.class) someclass has static final field rather @prepareeverythingfortest because if it's big project may take time prepare everything.