gistfile1.java

class Foo {
  public void dog() {
    print("woof");
  }

  public void cat() {
    print("meow");
  }

  public void both() {
    dog(); cat();
  }
}

class Test {
  public void test() {
    Foo foo = new Foo();
    Foo mySpy = spy(foo);
    doThrow(new RTE("x")).when(mySpy).cat();

    foo.cat(); // meows
    foo.dog(); // barks
    foo.both(); // does both
    mySpy.both(); // does both
    mySpy.cat(); // throws
  }
}