chore: Add inbox id in get campaigns API (#2278)

app/javascript/dashboard/api/inboxes.js

@@ -9,6 +9,10 @@ class Inboxes extends ApiClient {
   getAssignableAgents(inboxId) {
     return axios.get(`${this.url}/${inboxId}/assignable_agents`);
   }
+
+  getCampaigns(inboxId) {
+    return axios.get(`${this.url}/${inboxId}/campaigns`);
+  }
 }
 
 export default new Inboxes();

app/javascript/dashboard/api/specs/campaign.spec.js

@@ -0,0 +1,13 @@
+import campaigns from '../campaigns';
+import ApiClient from '../ApiClient';
+
+describe('#CampaignAPI', () => {
+  it('creates correct instance', () => {
+    expect(campaigns).toBeInstanceOf(ApiClient);
+    expect(campaigns).toHaveProperty('get');
+    expect(campaigns).toHaveProperty('show');
+    expect(campaigns).toHaveProperty('create');
+    expect(campaigns).toHaveProperty('update');
+    expect(campaigns).toHaveProperty('delete');
+  });
+});