rock-paper-scissors/src/test/kotlin/rps/GameTest.kt

package rps

import rps.Move.*
import rps.Outcome.*
import kotlin.test.Test
import kotlin.test.assertEquals

class GameTest {
  @Test
  fun testOutcomeCalculation() {
    val games = listOf(
      Triple(PAPER, ROCK, WIN),
      Triple(ROCK, PAPER, LOSS),
      Triple(PAPER, SCISSORS, LOSS),
      Triple(ROCK, ROCK, DRAW),
      Triple(ROCK, LIZARD, WIN),
      Triple(LIZARD, SPOCK, WIN),
      Triple(SPOCK, PAPER, LOSS),
    )
    for ((first, second, expected) in games) {
      assertEquals(determineOutcome(first, second), expected)
    }
  }

  @Test
  fun `game summary should count outcomes`() {
    val gameLists = listOf(
      listOf(WIN, WIN, WIN) to GameSummary(3, 0, 0),
      listOf(WIN, DRAW, LOSS) to GameSummary(1, 1, 1),
      listOf(WIN, LOSS, WIN) to GameSummary(2, 0, 1),
      listOf(WIN, DRAW, DRAW, DRAW) to GameSummary(1, 3, 0),
    )
    for ((outcomes, expectedSummary) in gameLists) {
      assertEquals(outcomes.calculateGameSummary(), expectedSummary)
    }
  }

  // We can’t test the outcome because it’s random,
  // but at least we can verify that the total number is correct.
  @Test
  fun `game summary should have correct number of outcomes`() {
    val summary = playGame(50)
    assertEquals(summary.wins + summary.draws + summary.losses, 50)
  }
}