Update tests to use the imported icon, not display labels

__tests__/src/components/CompanionArea.test.js

 import React from 'react';
 import { shallow } from 'enzyme';
 import Slide from '@material-ui/core/Slide';
+import ArrowLeftIcon from '@material-ui/icons/ArrowLeftSharp';
+import ArrowRightIcon from '@material-ui/icons/ArrowRightSharp';
 import MiradorMenuButton from '../../../src/containers/MiradorMenuButton';
 import { CompanionArea } from '../../../src/components/CompanionArea';
 import CompanionWindowFactory from '../../../src/containers/CompanionWindowFactory';
@@ -69,7 +71,7 @@ describe('CompanionArea', () => {
     });
 
     expect(wrapper.find(MiradorMenuButton).length).toBe(1);
-    expect(wrapper.find(MiradorMenuButton).first().children('ArrowRightSharpIcon').length).toBe(1);
+    expect(wrapper.find(MiradorMenuButton).first().children(ArrowRightIcon).length).toBe(1);
     expect(wrapper.find(Slide).prop('direction')).toBe('right');
     expect(wrapper.find(MiradorMenuButton).prop('aria-expanded')).toBe(false);
     expect(wrapper.find('div.mirador-companion-windows').length).toBe(1);
@@ -91,7 +93,7 @@ describe('CompanionArea', () => {
     });
 
     expect(wrapper.find(MiradorMenuButton).length).toBe(1);
-    expect(wrapper.find(MiradorMenuButton).first().children('ArrowLeftSharpIcon').length).toBe(1);
+    expect(wrapper.find(MiradorMenuButton).first().children(ArrowLeftIcon).length).toBe(1);
     expect(wrapper.find(MiradorMenuButton).prop('aria-expanded')).toBe(true);
 
     expect(wrapper.find('div.mirador-companion-windows').length).toBe(1);

__tests__/src/components/FullScreenButton.test.js

 import React from 'react';
 import { shallow } from 'enzyme';
+import FullscreenIcon from '@material-ui/icons/FullscreenSharp';
+import FullscreenExitIcon from '@material-ui/icons/FullscreenExitSharp';
 import MiradorMenuButton from '../../../src/containers/MiradorMenuButton';
 import { FullScreenButton } from '../../../src/components/FullScreenButton';
 
@@ -36,7 +38,7 @@ describe('FullScreenButton', () => {
     });
 
     it('has the FullscreenIcon', () => {
-      expect(menuButton.children('FullscreenSharpIcon').length).toBe(1);
+      expect(menuButton.children(FullscreenIcon).length).toBe(1);
     });
 
     it('has the proper aria-label i18n key', () => {
@@ -58,7 +60,7 @@ describe('FullScreenButton', () => {
     });
 
     it('has the FullscreenExitIcon', () => {
-      expect(menuButton.children('FullscreenExitSharpIcon').length).toBe(1);
+      expect(menuButton.children(FullscreenExitIcon).length).toBe(1);
     });
 
     it('has the proper aria-label', () => {

__tests__/src/components/LanguageSettings.test.js

@@ -2,6 +2,7 @@ import React from 'react';
 import { shallow } from 'enzyme';
 import ListItemText from '@material-ui/core/ListItemText';
 import MenuItem from '@material-ui/core/MenuItem';
+import CheckIcon from '@material-ui/icons/CheckSharp';
 import { LanguageSettings } from '../../../src/components/LanguageSettings';
 
 /**
@@ -63,7 +64,7 @@ describe('LanguageSettings', () => {
       wrapper
         .find(MenuItem)
         .first()
-        .find('CheckSharpIcon')
+        .find(CheckIcon)
         .length,
     ).toBe(1);
   });

__tests__/src/components/NestedMenu.test.js

@@ -2,6 +2,8 @@ import React from 'react';
 import { shallow } from 'enzyme';
 import ListItemIcon from '@material-ui/core/ListItemIcon';
 import ListItemText from '@material-ui/core/ListItemText';
+import ExpandLessIcon from '@material-ui/icons/ExpandLessSharp';
+import ExpandMoreIcon from '@material-ui/icons/ExpandMoreSharp';
 import MenuItem from '@material-ui/core/MenuItem';
 import { NestedMenu } from '../../../src/components/NestedMenu';
 
@@ -61,11 +63,11 @@ describe('NestedMenu', () => {
     wrapper = createWrapper();
 
     expect(wrapper.state().nestedMenuIsOpen).toBe(false);
-    expect(wrapper.find('ExpandMoreSharpIcon').length).toBe(1);
-    expect(wrapper.find('ExpandLessSharpIcon').length).toBe(0);
+    expect(wrapper.find(ExpandMoreIcon).length).toBe(1);
+    expect(wrapper.find(ExpandLessIcon).length).toBe(0);
     wrapper.setState({ nestedMenuIsOpen: true });
-    expect(wrapper.find('ExpandMoreSharpIcon').length).toBe(0);
-    expect(wrapper.find('ExpandLessSharpIcon').length).toBe(1);
+    expect(wrapper.find(ExpandMoreIcon).length).toBe(0);
+    expect(wrapper.find(ExpandLessIcon).length).toBe(1);
   });
 
   it("renders the component's children based on the nestedMenuIsOpen state", () => {

__tests__/src/components/SearchPanelControls.test.js

@@ -4,6 +4,7 @@ import Autocomplete from '@material-ui/lab/Autocomplete';
 import CircularProgress from '@material-ui/core/CircularProgress';
 import Input from '@material-ui/core/Input';
 import TextField from '@material-ui/core/TextField';
+import SearchIcon from '@material-ui/icons/SearchSharp';
 import { SearchPanelControls } from '../../../src/components/SearchPanelControls';
 
 /**
@@ -56,7 +57,7 @@ describe('SearchPanelControls', () => {
       .dive()
       .dive();
     expect(divedInput.find(CircularProgress).length).toEqual(0);
-    expect(divedInput.find('SearchSharpIcon').length).toEqual(1);
+    expect(divedInput.find(SearchIcon).length).toEqual(1);
     expect(divedInput.find('Connect(WithPlugins(MiradorMenuButton))[type="submit"]').length).toEqual(1);
   });
 

__tests__/src/components/ViewerNavigation.test.js

 import React from 'react';
 import { shallow } from 'enzyme';
+import NavigationIcon from '@material-ui/icons/PlayCircleOutlineSharp';
 import MiradorMenuButton from '../../../src/containers/MiradorMenuButton';
 import { ViewerNavigation } from '../../../src/components/ViewerNavigation';
 
@@ -89,8 +90,8 @@ describe('ViewerNavigation', () => {
     });
 
     it('changes the arrow styles', () => {
-      const previous = wrapper.find(MiradorMenuButton).first().children('PlayCircleOutlineSharpIcon').props();
-      const next = wrapper.find(MiradorMenuButton).last().children('PlayCircleOutlineSharpIcon').props();
+      const previous = wrapper.find(MiradorMenuButton).first().children(NavigationIcon).props();
+      const next = wrapper.find(MiradorMenuButton).last().children(NavigationIcon).props();
       expect(previous.style).toEqual({});
       expect(next.style).toEqual({ transform: 'rotate(180deg)' });
     });
@@ -112,8 +113,8 @@ describe('ViewerNavigation', () => {
     });
 
     it('changes the arrow styles', () => {
-      const previous = wrapper.find(MiradorMenuButton).first().children('PlayCircleOutlineSharpIcon').props();
-      const next = wrapper.find(MiradorMenuButton).last().children('PlayCircleOutlineSharpIcon').props();
+      const previous = wrapper.find(MiradorMenuButton).first().children(NavigationIcon).props();
+      const next = wrapper.find(MiradorMenuButton).last().children(NavigationIcon).props();
       expect(previous.style).toEqual({ transform: 'rotate(270deg)' });
       expect(next.style).toEqual({ transform: 'rotate(90deg)' });
     });
@@ -131,8 +132,8 @@ describe('ViewerNavigation', () => {
     });
 
     it('changes the arrow styles', () => {
-      const previous = wrapper.find(MiradorMenuButton).first().children('PlayCircleOutlineSharpIcon').props();
-      const next = wrapper.find(MiradorMenuButton).last().children('PlayCircleOutlineSharpIcon').props();
+      const previous = wrapper.find(MiradorMenuButton).first().children(NavigationIcon).props();
+      const next = wrapper.find(MiradorMenuButton).last().children(NavigationIcon).props();
       expect(previous.style).toEqual({ transform: 'rotate(90deg)' });
       expect(next.style).toEqual({ transform: 'rotate(270deg)' });
     });