Add a basic test

src/public/Terminal.api.ts

@@ -475,6 +475,15 @@ describe('API Integration Tests', () => {
       });
     });
   });
+
+  describe('WebGL Renderer', () => {
+    it('load doesn\'t throw', async function(): Promise<any> {
+      this.timeout(10000);
+      await openTerminal({ rendererType: 'dom' });
+      await page.waitForSelector('.xterm style');
+      await page.evaluate(`window.term.loadWebgl();`);
+    });
+  });
 });
 
 async function openTerminal(options: ITerminalOptions = {}): Promise<void> {

src/renderer/dom/DomRenderer.ts

@@ -69,6 +69,7 @@ export class DomRenderer extends Disposable implements IRenderer {
       actualCellHeight: null
     };
     this._updateDimensions();
+    this._injectCss();
 
     this._rowFactory = new DomRendererRowFactory(_terminal.options, document);
 

src/renderer/webgl/WebglRenderer.ts

@@ -4,7 +4,7 @@
  */
 
 import { FLAGS } from '../Types';
-import { CharacterJoinerHandler, ITerminal } from '../../Types';
+import { ITerminal } from '../../Types';
 import { GlyphRenderer } from './GlyphRenderer';
 import { LinkRenderLayer } from './renderLayer/LinkRenderLayer';
 import { CursorRenderLayer } from './renderLayer/CursorRenderLayer';
@@ -208,7 +208,7 @@ export class WebglRenderer extends Disposable implements IRenderer {
     this._renderLayers.forEach(l => l.reset(this._terminal));
   }
 
-  public registerCharacterJoiner(handler: CharacterJoinerHandler): number {
+  public registerCharacterJoiner(handler: (text: string) => [number, number][]): number {
     return -1;
   }
 

src/renderer/webgl/renderLayer/Types.ts

@@ -4,7 +4,6 @@
  */
 
 import { IDisposable, IRenderDimensions, IColorSet, Terminal } from 'xterm';
-import { ICharacterJoiner } from '../../Types';
 
 export interface IRenderLayer extends IDisposable {
   /**
@@ -46,7 +45,7 @@ export interface IRenderLayer extends IDisposable {
   /**
    * Registers a handler to join characters to render as a group
    */
-  registerCharacterJoiner?(joiner: ICharacterJoiner): void;
+  registerCharacterJoiner?(handler: (text: string) => [number, number][]): void;
 
   /**
    * Deregisters the specified character joiner handler