Want to code faster? try TDD

public class Car {

private final Engine = new Engine();

  private void start(){
    putOnNeutral();
    applyBrakes():
    this.engine.start();
  }
    
  private void putOnBrakes(){
  	//business logic
  }
    
  private void applyBrakes(){
   	//business logic
  }

}

# PRESENTING CODE

Code Transitions

public class Car {

  private final Engine;
  
  public Car(Engine engine){
    this.engine= engine;
  }

  private void start(){
    putOnNeutral();
    applyBrakes():
    this.engine.start();
  }

}

# TDD

Code Transitions


public class CarShould {
  
  @Test
  public void startCarEngine(){
    Car car = new Car();
    car.start();
    //nothing to assert!!
  }
}

# PRESENTING CODE

Testable Code


public class CarShould {
  
  @Test
  public void startCarEngine(){
    Engine engine = new FakeEngine();
    Car car = new Car(engine);
    car.start();
    
    assertThat(engine.isOn()).IsTrue();
  }
}

# PRESENTING CODE

Testable Code

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// Measure the distance between two points
const distanceBetween = ( p1, p2 ) => {
  const dx = p1[0]-p2[0];
  const dy = p1[1]-p2[1];

  return Math.sqrt( dx*dx + dy*dy );
}

distanceBetween([10,10], [50,50])

# PRESENTING CODE