Fix broken tests and added npm run test-watch to have jest run everytime a change is made

src/redux/highscore.spec.js

@@ -30,7 +30,11 @@ const highscores = [
 
 test("Register highscore where there is only 1 out 10 scores stored", () => {
   const result1 = reducers(undefined, registerHighscore({ name: "test", score: 10, gameId: 2 }));
-  expect(result1).toStrictEqual({ highscores: [{ name: "test", score: 10, gameId: 2 }], lastGameId: 2 });
+  expect(result1).toStrictEqual({
+    highscores: [{ name: "test", score: 10, gameId: 2 }],
+    lastGameId: 2,
+    lastUsername: "test"
+  });
 });
 
 test("Register highscore when there are more than 10 scores stored and the new score is not in the top 10", () => {
@@ -50,7 +54,8 @@ test("Register highscore when there are more than 10 scores stored and the new s
       { name: "mock80", score: 80, gameId: 12 },
       { name: "mock70", score: 70, gameId: 20 }
     ],
-    lastGameId: 8
+    lastGameId: 8,
+    lastUsername: "test"
   });
 });
 
@@ -69,7 +74,8 @@ test("Register highscore when there are more than 10 scores stored and the new s
       { name: "mock90", score: 90, gameId: 2 },
       { name: "mock80", score: 80, gameId: 12 }
     ],
-    lastGameId: 3
+    lastGameId: 3,
+    lastUsername: "test"
   });
 });
 
@@ -88,7 +94,8 @@ test("Register highscore when there are more than 10 scores stored and the new s
       { name: "mock80", score: 80, gameId: 12 },
       { name: "mock70", score: 70, gameId: 20 }
     ],
-    lastGameId: 99
+    lastGameId: 99,
+    lastUsername: "test"
   });
 });