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. public class Fight { private State state = new State(); private Player player1, player2; public Fight(Player player1, Player player2) { this.player1 = player1; this.player2 = player2; } ... public void attack(Player attacker, Weapon weapon) { Player opponent = getOpponentOf(attacker); int damage = calculateDamage(opponent, weapon); opponent.setHp(opponent.getHp() - damage); Utility.updatePlayer(opponent); updateState(); } public State getState() { return state; } ... } 

. public class FightTest { @Test public void testAttack() { Player player1 = new Player(); Player player2 = new Player(); Weapon weapon = new Weapon(); Fight fight = new Fight(player1, player2); fight.attack(player1, weapon); fight.attack(player1, weapon); fight.attack(player1, weapon); State state = fight.getState(); assertThat(state.isFinished(), is(true)); } } 

  


public class Fight { private State state = new State(); private Player player1, player2; public Fight(Player player1, Player player2) { this.player1 = player1; this.player2 = player2; } ... public void attack(Player attacker, Weapon weapon) { Player opponent = getOpponentOf(attacker); int damage = calculateDamage(opponent, weapon); opponent.setHp(opponent.getHp() - damage); Utility.updatePlayer(opponent); updateState(); } public State getState() { return state; } ... } . 

B . D public class Fight { private State state = new State(); private Player player1, player2; public Fight(Player player1, Player player2) { this.player1 = player1; this.player2 = player2; } ... public void attack(Player attacker, Weapon weapon) { Player opponent = getOpponentOf(attacker); int damage = calculateDamage(opponent, weapon); opponent.setHp(opponent.getHp() - damage); Utility.updatePlayer(opponent); updateState(); } public State getState() { return state; } ... } . 

public class Fight { private State state = new State(); private Player player1, player2; public Fight(Player player1, Player player2) { this.player1 = player1; this.player2 = player2; } ... public void attack(Player attacker, Weapon weapon) { Player opponent = getOpponentOf(attacker); int damage = calculateDamage(opponent, weapon); opponent.setHp(opponent.getHp() - damage); Utility.updatePlayer(opponent); updateState(); } public State getState() { return state; } ... } . 

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F . interface PlayerUpdater { public void updatePlayer(Player player); } F 

public class PlayerUpdaterImpl implements PlayerUpdater { @Override public void updatePlayer(Player player) { Utility.updatePlayer(player); } } . 

B . public class Fight { private State state = new State(); private Player player1, player2; private final PlayerUpdater updater; public Fight(Player player1, Player player2) { this(player1, player2, new PlayerUpdaterImpl()); } protected Fight(Player player1, Player player2, PlayerUpdater updater) { this.player1 = player1; this.player2 = player2; this.updater = updater; } ... public void attack(Player attacker, Weapon weapon) { Player opponent = getOpponentOf(attacker); int damage = calculateDamage(opponent, weapon); opponent.setHealth(opponent.getHealth() - damage); updater.updatePlayer(opponent); updateState(); } } . P U . . .. . F 

P . ( ( public class Fight { private State state = new State(); private Player player1, player2; private final PlayerUpdater updater; public Fight(Player player1, Player player2) { this(player1, player2, new PlayerUpdaterImpl()); } protected Fight(Player player1, Player player2, PlayerUpdater updater) { this.player1 = player1; this.player2 = player2; this.updater = updater; } ... public void attack(Player attacker, Weapon weapon) { Player opponent = getOpponentOf(attacker); int damage = calculateDamage(opponent, weapon); opponent.setHealth(opponent.getHealth() - damage); updater.updatePlayer(opponent); updateState(); } } ) ) . I U B D ( I ( ( I F 

import static org.mockito.Mockito.*; public class FightTest { @Test public void testAttack() { Player player1 = new Player(); Player player2 = new Player(); Weapon weapon = new Weapon(); // PlayerUpdater    PlayerUpdater updater = mock(PlayerUpdater.class); // Fight  Fight fight = new Fight(player1, player2, updater); fight.registerHit(player1, weapon); fight.registerHit(player1, weapon); fight.registerHit(player1, weapon); State state = fight.getState(); assertThat(state.isFinished(), is(true)); // updatePlayer() 3 
  verify(updater, times(3)).updatePlayer(player2); } } M . F P U F 

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