Tested all fruit mutations

src/store/index.js

@@ -1,13 +1,15 @@
 import Vue from "vue";
 import Vuex from "vuex";
+import mutations from "./mutations";
+
+export const state = {
+  fruits: [],
+  fruit: {}
+};
 
 Vue.use(Vuex);
 
 export default new Vuex.Store({
-  state: {
-    fruits: []
-  },
-  mutations: import("./mutations.js"),
-  actions: {},
-  modules: {}
+  state,
+  mutations
 });

src/store/mutations.js

@@ -1,5 +1,14 @@
 export default {
-  setFruits(state, fruits) {
+  setFruits: (state, fruits) => {
     state.fruits = fruits;
+  },
+  setFruit: (state, fruit) => {
+    state.fruit = fruit;
+  },
+  addFruit: (state, fruit) => {
+    state.fruits = [...state.fruits, fruit];
+  },
+  removeFruit: (state, id) => {
+    state.fruits = state.fruits.filter(item => item.id != id);
   }
 };