Fixed removing tasks from challenges (#11254)

* fixed missing event handler for removing tasks in challenges

* renamed test

* simplified challengeDetail test

test/client/unit/specs/components/challenges/challengeDetail.js

@@ -0,0 +1,61 @@
+import { shallowMount, createLocalVue } from '@vue/test-utils';
+import ChallengeDetailComponent from 'client/components/challenges/challengeDetail.vue';
+import Store from 'client/libs/store';
+
+const localVue = createLocalVue();
+localVue.use(Store);
+
+describe('Challenge Detail', () => {
+  let store;
+  let wrapper;
+
+  beforeEach(() => {
+    store = new Store({
+      state: {
+        user: {
+          data: {
+            contributor: {
+              admin: false,
+            },
+            challenges: [],
+            stats: {
+            },
+            flags: {},
+            preferences: {},
+            party: {
+              quest: {
+              },
+            },
+          },
+        },
+      },
+      actions: {
+        'members:getChallengeMembers': () => {},
+        'challenges:getChallenge': () => [
+          {_id: '1', group: { name: '', type: ''}, memberCount: 1, name: '', summary: '', description: '', leader: '', price: 1},
+        ],
+        'tasks:getChallengeTasks': () => [
+          {_id: '1', type: 'habit'},
+          {_id: '2', type: 'daily'},
+          {_id: '3', type: 'reward'},
+          {_id: '4', type: 'todo'},
+        ],
+      },
+      getters: {
+      },
+    });
+    wrapper = shallowMount(ChallengeDetailComponent, {
+      store,
+      localVue,
+      mocks: {
+        $t: (string) => string,
+      },
+    });
+  });
+
+  it('removes a destroyed task from task list', () => {
+    let taskToRemove = {_id: '1', type: 'habit'};
+    wrapper.vm.taskDestroyed(taskToRemove);
+    expect(wrapper.vm.tasksByType[taskToRemove.type].length).to.eq(0);
+  });
+});