Add some OscLinkService unit tests

src/common/services/OscLinkService.test.ts

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2020 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { assert } from 'chai';
+import { AttributeData } from 'common/buffer/AttributeData';
+import { BufferService } from 'common/services/BufferService';
+import { OptionsService } from 'common/services/OptionsService';
+import { OscLinkService } from 'common/services/OscLinkService';
+import { IBufferService, IOptionsService, IOscLinkService } from 'common/services/Services';
+
+describe('OscLinkService', () => {
+  describe('constructor', () => {
+    let bufferService: IBufferService;
+    let optionsService: IOptionsService;
+    let oscLinkService: IOscLinkService;
+    beforeEach(() => {
+      optionsService = new OptionsService({ rows: 3, cols: 10 });
+      bufferService = new BufferService(optionsService);
+      oscLinkService = new OscLinkService(bufferService);
+    });
+
+    it('link IDs are created and fetched consistently', () => {
+      const linkId = oscLinkService.registerLink({ id: 'foo', uri: 'bar' });
+      assert.ok(linkId);
+      assert.equal(oscLinkService.registerLink({ id: 'foo', uri: 'bar' }), linkId);
+    });
+
+    it('should dispose the link ID when the last marker is trimmed from the buffer', () => {
+      // Activate the alt buffer to get 0 scrollback
+      bufferService.buffers.activateAltBuffer();
+      const linkId = oscLinkService.registerLink({ id: 'foo', uri: 'bar' });
+      assert.ok(linkId);
+      bufferService.scroll(new AttributeData());
+      assert.notStrictEqual(oscLinkService.registerLink({ id: 'foo', uri: 'bar' }), linkId);
+    });
+
+    it('should fetch link data from link id', () => {
+      const linkId = oscLinkService.registerLink({ id: 'foo', uri: 'bar' });
+      assert.deepStrictEqual(oscLinkService.getLinkData(linkId), { id: 'foo', uri: 'bar' });
+    });
+  });
+});