onOptionChange/onSpecificOptionChange tests

src/common/services/OptionsService.test.ts

@@ -5,6 +5,7 @@
 
 import { assert } from 'chai';
 import { OptionsService, DEFAULT_OPTIONS } from 'common/services/OptionsService';
+import { IDisposable } from 'common/Types';
 
 describe('OptionsService', () => {
   describe('constructor', () => {
@@ -71,4 +72,44 @@ describe('OptionsService', () => {
       assert.equal(service.options.fontWeight, DEFAULT_OPTIONS.fontWeight, 'Wrong string literals should be reset to default');
     });
   });
+  describe('onOptionChange', () => {
+    let service: OptionsService;
+    beforeEach(() => {
+      service = new OptionsService({});
+    });
+    it('should fire on any option change', async () => {
+      let disposable: IDisposable;
+      await new Promise<void>(r => {
+        disposable = service.onOptionChange(e => {
+          assert.strictEqual(e, 'cursorWidth');
+          r();
+        });
+        service.options.cursorWidth = 10;
+      });
+      disposable!.dispose();
+      await new Promise<void>(r => {
+        service.onOptionChange(e => {
+          assert.strictEqual(e, 'scrollback');
+          r();
+        });
+        service.options.scrollback = 20;
+      });
+    });
+  });
+  describe('onSpecificOptionChange', () => {
+    let service: OptionsService;
+    beforeEach(() => {
+      service = new OptionsService({});
+    });
+    it('should fire only on a specific option change', async () => {
+      await new Promise<void>(r => {
+        service.onSpecificOptionChange('scrollback', e => {
+          assert.strictEqual(e, 20);
+          r();
+        });
+        service.options.cursorWidth = 10;
+        service.options.scrollback = 20;
+      });
+    });
+  });
 });