Tests from college scala test presentation

Scala test presentation

//
// Presentation: https://goo.gl/GhYvKy
// Dependency: libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.5" % "test"
//


import org.scalatest.{FunSpec, FunSuite}

object Calculator {
  def sum(a: Int, b: Int): Int = {
    a + b
  }

  def divide(a: Int, b: Int): Int = {
    a / b
  }
}

/**
  * Created by Marcin Szalek on 13.03.18.
  */
class CalculatorTest extends FunSuite {
  test("Calculator should sum 2 ints") {
    var result = Calculator.sum(5, 7);
    assert(result == 12)
  }

  test("Division wokrs") {
    val res = Calculator.divide(10, 5)
    assert(res == 2)
  }

  test("Division by 0") {
    assertThrows[ArithmeticException] {
      Calculator.divide(10, 0)
    }
  }

}

import org.scalatest.FlatSpec

class SetSpec extends FlatSpec {

  "An empty Set" should "have size 0" in {
    assert(Set.empty.size == 0)
  }

  it should "produce NoSuchElementException when head is invoked" in {
    assertThrows[NoSuchElementException] {
      Set.empty.head
    }
  }
}

class SetSpec2 extends FunSpec {

  describe("A Set") {
    describe("when empty") {
      var set: Set[Int] = Set.empty

      it("should have size 0") {
        assert(set.size == 0)
      }

      it("should produce NoSuchElementException when head is invoked") {
        assertThrows[NoSuchElementException] {
          set.head
        }
      }
    }

    describe("when not empty") {
      var set: Set[Int] = Set.empty
      set += 5

      it("should have size 1") {
        assert(set.size == 1)
      }
    }
  }
}

import org.scalatest._

class TVSet {
  private var on: Boolean = false

  def isOn: Boolean = on

  def pressPowerButton() {
    on = !on
  }
}

class TVSetSpec extends FeatureSpec with GivenWhenThen {

  info("As a TV set owner")
  info("I want to be able to turn the TV on and off")
  info("So I can watch TV when I want")
  info("And save energy when I'm not watching TV")

  feature("TV power button") {
    scenario("User presses power button when TV is off") {

      Given("a TV set that is switched off")
      val tv = new TVSet
      assert(!tv.isOn)

      When("the power button is pressed")
      tv.pressPowerButton()

      Then("the TV should switch on")
      assert(tv.isOn)
    }

    scenario("User presses power button when TV is on") {

      Given("a TV set that is switched on")
      val tv = new TVSet
      tv.pressPowerButton()
      assert(tv.isOn)

      When("the power button is pressed")
      tv.pressPowerButton()

      Then("the TV should switch off")
      assert(!tv.isOn)
    }
  }
}