In [1]:

import $ivy.`org.scalatest::scalatest:3.0.5`

Out[1]:

import $ivy.$

Exercises¶

Part 1¶

Add a new non-implemented method to trait Fruit, that doesn't have any argument and returns a Double. Take method color as a reference

In [1]:

trait Fruit {
  def color: String
  ???
}

Out[1]:

defined trait Fruit

Part 2¶

Next, we have the Companion Object for trait Fruit that we created in PART I. Implement method create, that creates a Fruit, using the argument _color, and setting the price to "3.0".

TIP: Remember that a trait has no constructors, so you'll have to use anonymous class syntax to create an instance. (new Fruit {...})

In [2]:

object Fruit {
  def create(_color: String): Fruit = ???
}

Out[2]:

defined object Fruit

Part 3¶

Make class Banana extend from trait Fruit, setting the method color to "yellow" and receiving the price in the constructor.

In [3]:

class Banana {
  def color: String = ???
}

Out[3]:

defined class Banana

Part 4¶

Create a fruit with any color using Fruit.create and a banana of any price using Banana class' constructor.

In [ ]:

import org.scalatest._
class Test(fruit:Fruit, banana:Banana) extends FunSpec with Matchers {
    describe("The fruit") {
    it("should cost 3.0") {
      // Uncomment next line once the exercise is done
      // fruit.price shouldBe 3.0
    }
  }

  describe("The banana") {
    ignore("should be \"yellow\"") {
      banana.color shouldBe "yellow"
    }
  }
}

In [ ]:

val fruit: Fruit = ???
val banana: Banana = ???

run(new Test(fruit, banana))