Demo :: Test Isolation

1.java

FizzBuzz fizzBuzz = new FizzBuzz();

@Test
public void กรณีอื่นๆ() {
	assertEquals("1", fizzBuzz.say(1));
}

10.java

class MockCounter implements CounterPersistence {

	private int expectedNumber;
	private boolean done;
	
	public MockCounter(int expectedNumber) {
		this.expectedNumber = expectedNumber;
	}
	
	public void setNumber(int number) {
		assertEquals(expectedNumber, number);
		done = true;
	}
	
	public boolean verify(){
		return done;
	}
	
	public int getNumber(){
		return 0;
	}
	
}

11.java

@Test
public void checkBehaviorOfMockCounter() {
	int input = 1;
	MockCounter counter = new MockCounter(input);
	
	FizzBuzz fizzBuzz = new FizzBuzz(counter);
	fizzBuzz.say(input);
	
	assertTrue(counter.verify());
}

2.java

interface CounterPersistence {

}

3.java

class StubCounter implements CounterPersistence {
	
}

4.java

@Test
public void กรณีอื่นๆ() {
	CounterPersistence counter = new StubCounter();
	FizzBuzz fizzBuzz = new FizzBuzz(counter);
	
	assertEquals("1", fizzBuzz.say(1));
}

5.java

interface CounterPersistence {
	void setNumber(int number);
}

6.java

class StubCounter implements CounterPersistence {

	private int number;
	
	public void setNumber(int number) {
		this.number = number;
	}
	
}

7.java

@Test
public void กรณีอื่นๆ() {
	int input = 1;
	CounterPersistence counter = new StubCounter();
	
	FizzBuzz fizzBuzz = new FizzBuzz(counter);
	
	assertEquals("1", fizzBuzz.say(input));
}

class FizzBuzz {
       CounterPersistence counter;

       public String say(int number) {
          this.counter.setNumber(number);
          ...
   
       }
}

8.java

class StubCounter implements CounterPersistence {

	private int number;
	
	public void setNumber(int number) {
		this.number = number;
	}
	
	public int getNumber(){
		return this.number;
	}
	
}

9.java

@Test
public void checkNumberOfCounterPersistence() {
	int input = 1;
	CounterPersistence counter = new StubCounter();
	
	FizzBuzz fizzBuzz = new FizzBuzz(counter);
	fizzBuzz.say(input);
	
	assertEquals(input, counter.getNumber());
}