UnicodeService & provider

src/common/services/UnicodeService.test.ts

@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { assert } from 'chai';
+import { UnicodeService } from 'common/services/UnicodeService';
+import { IUnicodeVersionProvider } from 'common/services/Services';
+
+class DummyProvider implements IUnicodeVersionProvider {
+  version = '123';
+  wcwidth(n: number): number {
+    return 123;
+  }
+}
+
+describe('unicode provider', () => {
+  let us: UnicodeService;
+  beforeEach(() => {
+    us = new UnicodeService();
+  });
+  it('default to V6', () => {
+    assert.equal(us.activeVersion, '6');
+    assert.deepEqual(us.versions, ['6']);
+    assert.doesNotThrow(() => { us.activeVersion = '6'; }, `unknown Unicode version "6"`);
+    assert.equal(us.getStringCellWidth('hello'), 5);
+  });
+  it('activate should throw for unknown version', () => {
+    assert.throws(() => { us.activeVersion = '55'; }, 'unknown Unicode version "55"');
+  });
+  it('should notify about version change', () => {
+    const notes: string[] = [];
+    us.onChange(version => notes.push(version));
+    const dummyProvider = new DummyProvider();
+    us.register(dummyProvider);
+    us.activeVersion = dummyProvider.version;
+    assert.deepEqual(notes, [dummyProvider.version]);
+  });
+  it('correctly changes provider impl', () => {
+    assert.equal(us.getStringCellWidth('hello'), 5);
+    const dummyProvider = new DummyProvider();
+    us.register(dummyProvider);
+    us.activeVersion = dummyProvider.version;
+    assert.equal(us.getStringCellWidth('hello'), 123 * 5);
+  });
+  it('wcwidth V6 emoji test', () => {
+    const widthV6 = us.getStringCellWidth('🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣');
+    assert.equal(widthV6, 10);
+  });
+});