dkurschner1 tdd excercise

src/Car.java

@@ -44,13 +44,22 @@ public void accelerate(int amount){
 		}
 	}
 
+	public void decelerate(int amount){
+		int reducedSpeed = speed - amount;
+		if(amount <= speed){
+			speed = reducedSpeed;
+		}else{
+			speed = 0;
+		}
+	}
+
 	/**
 	 * Displays the object as a string in the format
 	 * "Color: red, Speed: 100"
 	 * @return string representation of object. 
 	 */
 	public String toString(){
 		// not implemented!
-		return("");
+		return("Color: " + color + ", Speed: " + speed + "");
 	}
 }

test/CarTest.java

@@ -32,7 +32,21 @@ public void canDoToString(){
 	}
 
 	// Create and pass test for deceleration.
-
+	@Test 
+	public void canDecelerate(){
+		Car car1 = new Car("Red", 100);
+		car1.accelerate(50);
+		car1.decelerate(20);
+		assertThat(car1.getSpeed(), is(30));
+	}
 	// Create and pass test for no deceleration below 0.
 
+	@Test 
+	public void noDecelerateBelowZero(){
+		Car car1 = new Car("Red", 100);
+		car1.accelerate(20);
+		car1.decelerate(30);
+		assertThat(car1.getSpeed(), is(0));
+	}
+
 }