gmock_example.cpp

// This example comes from:
// https://code.google.com/p/googlemock/wiki/V1_7_ForDummies

#include <gmock/gmock.h>
#include <gtest/gtest.h>

class Turtle {
 public:
  virtual ~Turtle() {}
  virtual void PenUp() = 0;
  virtual void PenDown() = 0;
  virtual void Forward(int distance) = 0;
  virtual void Turn(int degrees) = 0;
  virtual void GoTo(int x, int y) = 0;
  virtual int GetX() const = 0;
  virtual int GetY() const = 0;
};

class Painter {
 public:
  Painter(Turtle *turtle) : _turtle(turtle) { }
  bool DrawCircle(int, int, int) {
    _turtle->PenDown();
    return true;
  }

 private:
  Turtle *_turtle;
};

class MockTurtle : public Turtle {
 public:
  MOCK_METHOD0(PenUp, void());
  MOCK_METHOD0(PenDown, void());
  MOCK_METHOD1(Forward, void(int distance));
  MOCK_METHOD1(Turn, void(int degrees));
  MOCK_METHOD2(GoTo, void(int x, int y));
  MOCK_CONST_METHOD0(GetX, int());
  MOCK_CONST_METHOD0(GetY, int());
};

using ::testing::AtLeast;

TEST(PainterTest, CanDrawSomething) {
  MockTurtle turtle;
  EXPECT_CALL(turtle, PenDown())
      .Times(AtLeast(1));

  Painter painter(&turtle);

  EXPECT_TRUE(painter.DrawCircle(0, 0, 10));
}