### Question:
ExecutionGraphManipulator extends ExecutionGraph { public void replaceInstruction(int insertAddress, BuilderInstruction instruction) { List<BuilderInstruction> instructions = new LinkedList<>(); instructions.add(instruction); replaceInstruction(insertAddress, instructions); } ExecutionGraphManipulator(ExecutionGraph graph, VirtualMethod method, VirtualMachine vm, DexBuilder dexBuilder); void addInstruction(MethodLocation location, BuilderInstruction instruction); void addInstruction(int address, BuilderInstruction newInstruction); int[] getAvailableRegisters(int address); List<ExecutionNode> getChildren(int address); DexBuilder getDexBuilder(); @Nullable BuilderInstruction getInstruction(int address); int[] getParentAddresses(int address); List<BuilderTryBlock> getTryBlocks(); @Override VirtualMachine getVM(); void removeInstruction(MethodLocation location); void removeInstruction(int address); void removeInstructions(List<Integer> addresses); void replaceInstruction(int insertAddress, BuilderInstruction instruction); void replaceInstruction(int insertAddress, List<BuilderInstruction> instructions); MethodLocation getLocation(int address);  }### Answer:
@Test public void replacingInstructionWithDifferentOpcodeWidthModifiesStateCorrectly() { Object[][] expected = new Object[][] { { 0, Opcode.CONST_16, new Object[][][] { { { 2, Opcode.CONST_4 } } } }, { 2, Opcode.CONST_4, new Object[][][] { { { 3, Opcode.CONST_4 } } } }, { 3, Opcode.CONST_4, new Object[][][] { { { 4, Opcode.CONST_4 } } } }, { 4, Opcode.CONST_4, new Object[][][] { { { 5, Opcode.CONST_4 } } } }, { 5, Opcode.CONST_4, new Object[][][] { { { 6, Opcode.RETURN_VOID } } } }, { 6, Opcode.RETURN_VOID, new Object[1][0][0] }, }; manipulator = OptimizerTester.getGraphManipulator(CLASS_NAME, "verySimple()V"); BuilderInstruction replacement = new BuilderInstruction21s(Opcode.CONST_16, 0, 0); manipulator.replaceInstruction(0, replacement); test(expected, manipulator); HeapItem consensus = manipulator.getRegisterConsensus(0, 0); assertEquals(0, consensus.getValue()); }
@Test public void replaceInstructionWithMultipleModifiesStateCorrectly() { Object[][] expected = new Object[][] { { 0, Opcode.CONST_4, new Object[][][] { { { 1, Opcode.CONST_16 } } } }, { 1, Opcode.CONST_16, new Object[][][] { { { 3, Opcode.CONST_16 } } } }, { 3, Opcode.CONST_16, new Object[][][] { { { 5, Opcode.CONST_4 } } } }, { 5, Opcode.CONST_4, new Object[][][] { { { 6, Opcode.CONST_4 } } } }, { 6, Opcode.CONST_4, new Object[][][] { { { 7, Opcode.CONST_4 } } } }, { 7, Opcode.CONST_4, new Object[][][] { { { 8, Opcode.RETURN_VOID } } } }, { 8, Opcode.RETURN_VOID, new Object[1][0][0] }, }; manipulator = OptimizerTester.getGraphManipulator(CLASS_NAME, "verySimple()V"); BuilderInstruction replacement1 = new BuilderInstruction21s(Opcode.CONST_16, 1, 1); BuilderInstruction replacement2 = new BuilderInstruction21s(Opcode.CONST_16, 2, 2); List<BuilderInstruction> replacements = new LinkedList<BuilderInstruction>(); replacements.add(replacement1); replacements.add(replacement2); manipulator.replaceInstruction(1, replacements); test(expected, manipulator); testHeritage(manipulator, 0); testHeritage(manipulator, 1); testHeritage(manipulator, 3); HeapItem consensus; consensus = manipulator.getRegisterConsensus(1, 1); assertEquals(1, consensus.getValue()); consensus = manipulator.getRegisterConsensus(3, 2); assertEquals(2, consensus.getValue()); }