bug with test length checks

Author: BLANC Etienne DISU/UOM

src/katas/christmasDelivery/christmasDelivery.test.ts

@@ -0,0 +1,40 @@
+import { ToyMachine, SantaSleigh, Present } from "./christmasDelivery";
+
+const toyMachine = new ToyMachine();
+const santaSleigh = new SantaSleigh();
+
+describe("ToyMachine object...", () => {
+  describe("makePresent() method:", () => {
+    // Reinit present stock:
+    toyMachine.presentStock = [];
+    // Make present in stock:
+    toyMachine.makePresent();
+    // Check:
+    test("should presentStock have a length of 1 after make", () => {
+      expect(toyMachine.presentStock).toHaveLength(1);
+    });
+    describe("givePresent() method:", () => {
+      toyMachine.makePresent();
+      const stockBefore = toyMachine.presentStock.length;
+      // Do method:
+      toyMachine.givePresent();
+      // Check:
+      test("should presentStock have a length of 1 after make", () => {
+        expect(toyMachine.presentStock).toHaveLength(stockBefore - 1);
+      });
+    });
+  });
+});
+
+describe("SantaSleigh object...", () => {
+  describe("putPresentOnBoard() method:", () => {
+    test("should output a Present object", () => {
+      // Reinit presents on sleigh:
+      santaSleigh.presents = [];
+      // Put a present on board:
+      santaSleigh.putPresentOnBoard(new Present());
+      // Check:
+      expect(santaSleigh.presents).toHaveLength(1);
+    });
+  });
+});

src/katas/christmasDelivery/christmasDelivery.ts

@@ -1,3 +1,25 @@
+export class Present {}
+
+export class ToyMachine {
+  presentStock: Array<Present> = [];
+  makePresent = () => {
+    this.presentStock.push(new Present());
+  };
+  givePresent = () => {
+    const presentToDeliver = this.presentStock.slice(0, 1);
+    return presentToDeliver;
+  };
+}
+
+export class Elf {}
+
+export class SantaSleigh {
+  presents: Array<Present> = [];
+  putPresentOnBoard = (present: Present) => {
+    this.presents.push(present);
+  };
+}
+
 // == MAIN ==
 if (require.main === module) {
 }