Java test internal class

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How to properly test the internal class method in java

How can I test the following code?

My application was developed in Java. I use JUnit and Mockito.

To test method1() I can create a mock for InjectedClass and a mock logic for someMethod() . But how does one properly test a method? Do I need to create a mock for method1() ?

UPDATE: Let me demonstrate real example.

public class Application < @Inject DAOFacade facade; //method1 public ReturnDTO getDTO(LiveServiceRequestParam requestParam) throws AffiliateIdentityException < ReturnDTO returnDTO = new ReturnDTO(); CoreProductRepository repo = recognizeProduct(ProdCodeTypeEnum.MPN, null, vendorBound); if(repo!=null)< //logic to fill some fileds in returnDTO >return returnDTO ; > //метод2 CoreProductRepository recognizeProduct(ProdCodeTypeEnum paramType, String prodCode, List vendors) < CoreProductRepository coreProductRepository = null; switch (paramType) < case MPN: coreProductRepository = facade.findByAlternativeMPN(prodCode, vendors); break; case EAN: coreProductRepository = facade.findByEan(prodCode, vendors); break; case DESCRIPTION: coreProductRepository = facade.findByName(prodCode, vendors); break; >return coreProductRepository; > > 

So, to test recognizeProduct i mock DAOfacade. But also I want test getDTO method which uses recognizeProduct method.

You should focus your test effort on public methods return value and not not on internal implementation.

Focusing on internal implementation causes tests to be harder to mantain since a basic refactoring not affecting the return value will probably require changing your tests.

Sometimes is impossible to avoid testing internal implementation since some methods return nothing and you need to «assert» something. In this case it seems you return something at some point, I’d focus on testing that.

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Java test internal class

There are four types of java inner classes that we generally use:general inner classes, local inner classes, anonymous inner classes, and static inner classes.Here is a test I did,To illustrate the characteristics of various inner classes.

Regarding the characteristics of inner classes,There is a detailed description in the code,as follows.

/* * java inner class test * * interobj reflection results: * * private int i * private interobj $intera ia * public interobj () * public static void main (java.lang.string []) * private int geti () * public void p () * public void pi () * public void pp () * public static void ppp () * public void pppp () * The following is a static method automatically generated by the compiler to access private properties or methods at the package level * static int access $0 (interobj) * / public class interobj < private int i=8; private intera ia=null; public interobj () < ia=new intera (); >private int geti () < return i; >public void p () < pi (); pp (); ppp (); pppp (); >/* * You can access methods and properties of any level in the "coating class" in a general inner class. The same can be done with coats * Access methods and properties at any level in the Inner Class. Because the inner class can hold a reference to the coat class object. * The "coating class" has its own private methods and properties that need to be accessed by the inner class The compiler will automatically generate * "Package" level static methods corresponding to private methods and properties, these methods need to use external class objects as * Is a parameter, so you can access private methods in the coat class and * Attributes. * For the outer class to access private methods and properties in the inner class,The same principle,When the inner class is compiled, * Generates "package" level static methods corresponding to private methods and properties that need to be accessed by the coat class. * * intera reflection results: * private int ia * Below is a reference to the coat class object held by the inner class * final interobj this $0 * The constructor takes a coat class object as a parameter * interobj $intera (interobj) * private void pa () * The following is a static method automatically generated by the compiler to access private properties or methods at the package level * static void access $0 (interobj $intera) * public void pa1 () * * / class intera < private int ia=9; private void pa () < system.out.println ("this is intera.pa:ia =" + ia + ", interobj.i =" + geti ()); >public void pa1 () < system.out.println ("this is intera.pa1:ia =" + ia + ", interobj.i =" + geti ()); >> /* * Local inner classes,Visible only inside the method,Other features are the same as general inner classes. * For local variables that need to be accessed,Must be set to final, because the local inner class can hold the * References to access properties and methods of external classes,But cannot access local variables in external class methods,All compilers * "Copy" a local variable in the local inner class (but for the basic types int, float and string * There is no copy of the type whose value does not change.) * The object is the same object, so the local variables used by local classes should be set to final, and cannot be modified * Change to ensure that the variables copied in the local and the variables in the external method point to the same object. Variable setting * Set to final, but the address of the object pointed to by the control variable does not change,Not the internal properties of the object it points to cannot be changed. * * Interb's reflection results: * * private int ib * Below is a reference to the coat class object held by the inner class * final interobj this $0 * The following is a reference copy of the local variable test object in the external method held by the inner class * private final test val $test * The constructor takes the coat class object and the local variable test as parameters * interobj $1 $interb (interobj, test) * private void pb () * The following is a static method automatically generated by the compiler to access private properties or methods at the package level * static void access $0 (interobj $1 $interb) * / public void pi () < final int s=5; final test test=new test (); class interb < private int ib=7; private void pb () < system.out.println ("this is interb.pb:ib =" + ib + ", (method) pi.s =" + s + ", test.t =" + test.gett ()); >> interb ib=new interb (); //This changes the internal state of test test referenced by the local inner class. //Result when calling ib.pb (), the output is the changed value 100 test.sett (100); ib.pb (); > /* * Static inner class,Used when you do not need to hold a reference to a "coat-like object". * * interc reflection result:(the static inner class has no reference to the coat class object) * private int ic * interc () * private void pc () * / static class interc < private int ic=6; private void pc () < system.out.println ("this is interc.pc:ic =" + ic); >> /* * Non-static methods,You can construct static and non-static inner classes. * Can access any permissioned properties and methods in the inner class * / public void pp () < intera ia=new intera (); ia.pa (); ia.pa1 (); interc ic=new interc (); ic.pc (); //Local inner class,Visible only inside methods //interb ib=new interb (); >/* * Static methods,Only static inner classes can be constructed. * Cannot construct non-static inner classes,Because there is no this in the static method to refer to the "coating class" object to construct * Need to reference the inner class object referenced by the outer class object. * / public static void ppp () < //intera ia=new intera (); //But it can be constructed as follows: interobj iobj=new interobj (); intera ia=iobj.new intera (); ia.pa (); ia.pa1 (); interc ic=new interc (); ic.pc (); //Local inner class,Visible only inside methods //interb ib=new interb (); >/* * Anonymous inner class test * / public void pppp () < testinterface tif=new testinterface () < public void pppp () < system.out.println ("testinterface.noname"); >> ; tif.pppp (); > /* * operation result: * this is interb.pb:ib=7, (method) pi.s=5, test.t=100 * this is intera.pa:ia=9, interobj.i=8 * this is intera.pa1:ia=9, interobj.i=8 * this is interc.pc:ic=6 * this is intera.pa:ia=9, interobj.i=8 * this is intera.pa1:ia=9, interobj.i=8 * this is interc.pc:ic=6 * testinterface.noname * / public static void main (string [] args) < interobj io=new interobj (); io.p (); >> /* * Interface for creating inner classes * / interface testinterface < public void pppp (); >/* * Local variable class for testing local inner classes * / class test < private int t=9; public int gett () < return t; >public void sett (int t1) < t=t1; >> 

public class innerclass < static toy toy=new toy () < string name="Lao Wu"; @override public void jump () < system.out.println (name + "out of the earth"); go (); >public void go () < system.out.println ("Run"); >> ; /* Inner class:the class defined inside the class * 1. Member inner class: * 1.1 member inner classes can directly access the properties of outer classes * 1.2 by external class name. this accesses the current object of the outer class * Member inner class instantiation object:outer class name. Inner class name Reference name=outer class object. new inner class name (); * 2. Static inner class * 2.1 Member resources of external classes cannot be accessed inside static inner classes,Static resources of external classes can only be accessed by class name * Static inner class instantiation object:outer class name. Inner class name Reference name=new Outer class name. Inner class name (); * 3. Local inner class: * 3.1 You can also directly access the properties of external classes * 3.2 can also be passed by external class name. this accesses the current object of the outer class * 3.3 Local inner classes can only be accessed from within methods,Modifiers can only be default * 4. Anonymous inner class:When a concrete subclass instance of a class is needed,Generate a class temporarily * new class name () < * Rewrite method; *>; * 4.1 Anonymous inner classes access properties of external methods,The attribute will be converted to a constant * 4.2 New properties and methods in anonymous inner classes,Can only be used inside anonymous inner classes * * / public static void main (string [] args) < person per=new person ("Lao Chen", 18); person.computer pc=per.new computer ("Alien"); person.computer pc1=new person ("Jane proud", 18) .new computer ("Alien"); pc.rungame (); pc1.rungame (); person.computer1 pc11=new person.computer1 ("Internet cafe computer"); pc11.rungame (); per.usecomputer (); string str="La la la"; //str="Rokuo even"; computer com=new computer () < @override public void rungame () < //todo auto-generated method stub system.out.println (per.age + "year-old" + per.name + "playing la la la la la demasita"); system.out.println (str); >> ; com.rungame (); //Exclusive for anonymous inner class of concrete class /* toy toy=new toy () < @override public void jump () < system.out.println ("Out of Earth"); >>;* / toy.jump (); toy.jump (); //toy.go (); //system.out.println(toy.); > > class person < string name; int age; static int age1=18; static string name1="Full-time expert"; public person (string name, int age) < super (); this.name=name; this.age=age; >public void playgame () < system.out.println (name + "play game"); >public class computer < string name; public computer (string name) < super (); this.name=name; >public void rungame () < system.out.println (name + "Run game"); system.out.println (age + "year-old" + person.this.name + "play game"); >> public static class computer1 < string name; public computer1 (string name) < super (); this.name=name; >public void rungame () < system.out.println (name + "Run game"); system.out.println (person.age1 + "" + person.name1 + "playing game"); >> public void usecomputer () < class computer < string name; public computer (string name) < super (); this.name=name; >public void rungame () < system.out.println (name + "Run game"); system.out.println (person.this.age + "" + person.this.name + "playing game"); >> computer com=new computer ("notebook"); com.rungame (); > > public interface computer < void rungame (); >public class toy < public void jump () < system.out.println ("Toy Jump"); >> 

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