Revamp VendingMachine.scala as cookbook example

* Move to cookbook
* Change FSM implementation to use switch & is
* Add non-FSM implementation
* Add execution-driven test

1 files changed, 39 insertions, 0 deletions

diff --git a/src/test/scala/examples/VendingMachineUtils.scala b/src/test/scala/examples/VendingMachineUtils.scala
new file mode 100644
index 00000000..e229dab5
--- /dev/null
+++ b/src/test/scala/examples/VendingMachineUtils.scala
@@ -0,0 +1,39 @@
+// See LICENSE for license details.
+
+package examples
+
+import scala.collection.mutable
+
+/* Useful utilities for testing vending machines */
+object VendingMachineUtils {
+  abstract class Coin(val name: String, val value: Int)
+  // US Coins
+  case object Penny extends Coin("penny", 1)
+  case object Nickel extends Coin("nickel", 5)
+  case object Dime extends Coin("dime", 10)
+  case object Quarter extends Coin("quarter", 25)
+
+  // Harry Potter Coins
+  case object Knut extends Coin("knut", Penny.value * 2) // Assuming 1 Knut is worth $0.02
+  case object Sickle extends Coin("sickle", Knut.value * 29)
+  case object Galleon extends Coin("galleon", Sickle.value * 17)
+
+  def getExpectedResults(inputs: Seq[Option[Coin]], sodaCost: Int): Seq[Boolean] = {
+    var value = 0
+    val outputs = mutable.ArrayBuffer.empty[Boolean]
+    for (input <- inputs) {
+      val incValue = input match {
+        case Some(coin) => coin.value
+        case None => 0
+      }
+      if (value >= sodaCost) {
+        outputs.append(true)
+        value = 0
+      } else {
+        outputs.append(false)
+        value += incValue
+      }
+    }
+    outputs
+  }
+}