[Testing] Fixes console errors while running npm test (#3593)

* ERROR: Error: [$injector:unpr] Unknown provider: exportImageServiceProvider <- exportImageService
* [Vue warn]: Injection "stylesManager" not found
* [Vue warn]: Error in mounted hook: "TypeError: identifier is undefined"

src/plugins/condition/pluginSpec.js

@@ -22,6 +22,7 @@
 
 import { createOpenMct, resetApplicationState } from "utils/testing";
 import ConditionPlugin from "./plugin";
+import stylesManager from '@/ui/inspector/styles/StylesManager';
 import StylesView from "./components/inspector/StylesView.vue";
 import Vue from 'vue';
 import {getApplicableStylesForItem} from "./utils/styleUtils";
@@ -402,7 +403,8 @@ describe('the plugin', function () {
             component = new Vue({
                 provide: {
                     openmct: openmct,
-                    selection: selection
+                    selection: selection,
+                    stylesManager
                 },
                 el: viewContainer,
                 components: {

src/plugins/notebook/snapshot.js

@@ -7,15 +7,14 @@ export default class Snapshot {
     constructor(openmct) {
         this.openmct = openmct;
         this.snapshotContainer = new SnapshotContainer(openmct);
-        this.exportImageService = openmct.$injector.get('exportImageService');
-        this.dialogService = openmct.$injector.get('dialogService');
 
         this.capture = this.capture.bind(this);
         this._saveSnapShot = this._saveSnapShot.bind(this);
     }
 
     capture(snapshotMeta, notebookType, domElement) {
-        this.exportImageService.exportPNGtoSRC(domElement, 's-status-taking-snapshot')
+        const exportImageService = this.openmct.$injector.get('exportImageService');
+        exportImageService.exportPNGtoSRC(domElement, 's-status-taking-snapshot')
             .then(function (blob) {
                 const reader = new window.FileReader();
                 reader.readAsDataURL(blob);

src/plugins/timeline/pluginSpec.js

@@ -98,6 +98,10 @@ describe('the plugin', function () {
 
         beforeEach((done) => {
             planDomainObject = {
+                identifier: {
+                    key: 'test-object',
+                    namespace: ''
+                },
                 type: 'plan',
                 id: "test-object",
                 selectFile: {