package mockit;
   
   import static java.util.Arrays.asList;
   
   import static org.junit.jupiter.api.Assertions.assertEquals;
   import static org.junit.jupiter.api.Assertions.assertSame;
   import static org.junit.jupiter.api.Assertions.fail;
   
   import java.lang.reflect.Member;
  import java.lang.reflect.Method;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * The Class FakingEverythingTest.
   */
  final class FakingEverythingTest {
  
      /** The traces. */
      final List<String> traces = new ArrayList<>();
  
      /**
       * Trace entry.
       *
       * @param inv
       *            the inv
       */
      void traceEntry(Invocation inv) {
          traces.add("Entered " + getDescription(inv));
      }
  
      /**
       * Trace exit.
       *
       * @param inv
       *            the inv
       */
      void traceExit(Invocation inv) {
          traces.add("Exited " + getDescription(inv));
      }
  
      /**
       * Gets the description.
       *
       * @param inv
       *            the inv
       *
       * @return the description
       */
      String getDescription(Invocation inv) {
          Member member = inv.getInvokedMember();
          String args = Arrays.toString(inv.getInvokedArguments());
          Object instance = inv.getInvokedInstance();
          return member.getDeclaringClass().getSimpleName() + '#' + member.getName() + " with " + args + " on "
                  + instance;
      }
  
      /**
       * Fake every method in single class.
       */
      @Test
      void fakeEveryMethodInSingleClass() {
          new MockUp<TargetClass>() {
              @Mock
              Object $advice(Invocation inv) {
                  traceEntry(inv);
  
                  try {
                      return inv.proceed();
                  } finally {
                      traceExit(inv);
                  }
              }
  
              @Mock
              void validateSomething(Invocation inv) {
                  Method m = inv.getInvokedMember();
                  assertEquals("validateSomething", m.getName());
              }
          };
  
          TargetClass.staticMethod(123);
          final TargetClass tc0 = new TargetClass();
          assertEquals(4, tc0.doSomething("test", true));
          tc0.performAction(new Runnable() {
              @Override
              public void run() {
                  tc0.doSomething("internal", false);
              }
  
              @Override
              public String toString() {
                  return "action";
              }
          });
          TargetClass tc1 = new TargetClass(1);
         tc1.performAction(null);
         tc1.validateSomething();
 
         List<String> expectedTraces = asList("Entered TargetClass#staticMethod with [123] on null",
                 "Exited TargetClass#staticMethod with [123] on null",
                 "Entered TargetClass#doSomething with [test, true] on TargetClass0",
                 "Exited TargetClass#doSomething with [test, true] on TargetClass0",
                 "Entered TargetClass#performAction with [action] on TargetClass0",
                 "Entered TargetClass#doSomething with [internal, false] on TargetClass0",
                 "Exited TargetClass#doSomething with [internal, false] on TargetClass0",
                 "Exited TargetClass#performAction with [action] on TargetClass0",
                 "Entered TargetClass#performAction with [null] on TargetClass1",
                 "Exited TargetClass#performAction with [null] on TargetClass1");
         assertEquals(expectedTraces, traces);
     }
 
     /**
      * Fake every method in single class with advice only.
      */
     @Test
     void fakeEveryMethodInSingleClassWithAdviceOnly() {
         new MockUp<TargetClass>() {
             @Mock
             Object $advice(Invocation inv) {
                 Integer i = inv.proceed();
                 return i + 2;
             }
         };
 
         assertEquals(1, new TargetClass().doSomething("", false));
     }
 
     /**
      * Fake every method in class hierarchy.
      *
      * @param <B>
      *            the generic type
      */
     @Test
     <B extends TargetClass> void fakeEveryMethodInClassHierarchy() {
         new MockUp<B>() {
             @Mock
             Object $advice(Invocation inv) {
                 traceEntry(inv);
 
                 try {
                     return inv.proceed();
                 } finally {
                     traceExit(inv);
                 }
             }
         };
 
         final TargetSubclass s1 = new TargetSubclass(1);
         assertEquals(4, s1.doSomething("test", true));
         assertEquals("123", s1.additionalMethod(123));
         s1.performAction(new Runnable() {
             @Override
             public void run() {
                 assertSame(s1, this);
             }
 
             @Override
             public String toString() {
                 return "sub-action";
             }
         });
 
         TargetClass s2 = new TargetClass(2);
         s2.performAction(null);
 
         try {
             s2.validateSomething();
             fail();
         } catch (IllegalArgumentException e) {
             assertEquals("Invalid something", e.getMessage());
         }
 
         List<String> expectedTraces = asList("Entered TargetClass#doSomething with [test, true] on TargetSubclass1",
                 "Exited TargetClass#doSomething with [test, true] on TargetSubclass1",
                 "Entered TargetSubclass#additionalMethod with [123] on TargetSubclass1",
                 "Exited TargetSubclass#additionalMethod with [123] on TargetSubclass1",
                 "Entered TargetSubclass#performAction with [sub-action] on TargetSubclass1",
                 "Entered TargetSubclass#additionalMethod with [45] on TargetSubclass1",
                 "Exited TargetSubclass#additionalMethod with [45] on TargetSubclass1",
                 "Exited TargetSubclass#performAction with [sub-action] on TargetSubclass1",
                 "Entered TargetClass#performAction with [null] on TargetClass2",
                 "Exited TargetClass#performAction with [null] on TargetClass2",
                 "Entered TargetClass#validateSomething with [] on TargetClass2",
                 "Exited TargetClass#validateSomething with [] on TargetClass2");
         assertEquals(expectedTraces, traces);
     }
 
     /**
      * The Class PublicFake.
      */
     public static final class PublicFake extends MockUp<TargetClass> {
 
         /**
          * $advice.
          *
          * @param inv
          *            the inv
          *
          * @return the object
          */
         @Mock
         public static Object $advice(Invocation inv) {
             Object[] args = inv.getInvokedArguments();
 
             if (args.length > 0) {
                 Integer i = (Integer) args[0];
                 return -i;
             }
 
             return null;
         }
     }
 
     /**
      * Public advice method in public fake class.
      */
     @Test
     void publicAdviceMethodInPublicFakeClass() {
         new PublicFake();
 
         new TargetClass().validateSomething();
         int i = TargetClass.staticMethod(123);
 
         assertEquals(-123, i);
     }
 }
 
 class TargetClass {
     final int value;
 
     TargetClass() {
         value = 0;
     }
 
     TargetClass(int value) {
         this.value = value;
     }
 
     public static int staticMethod(int i) {
         return i;
     }
 
     int doSomething(String s, boolean b) {
         return b ? s.length() : -1;
     }
 
     protected void performAction(Runnable action) {
         if (action != null) {
             action.run();
         }
     }
 
     protected void validateSomething() {
         throw new IllegalArgumentException("Invalid something");
     }
 
     @Override
     public String toString() {
         return getClass().getSimpleName() + value;
     }
 }
 
 final class TargetSubclass extends TargetClass {
     TargetSubclass(int value) {
         super(value);
     }
 
     String additionalMethod(int i) {
         return String.valueOf(i);
     }
 
     @Override
     protected void performAction(Runnable action) {
         additionalMethod(45);
         super.performAction(action);
     }
 }