debug: simple view model tests.

src/vs/workbench/parts/debug/test/common/debugViewModel.test.ts

+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import assert = require('assert');
+import { ViewModel } from 'vs/workbench/parts/debug/common/debugViewModel';
+import { StackFrame, Expression } from 'vs/workbench/parts/debug/common/debugModel';
+
+suite('Debug - View Model', () => {
+	var model: ViewModel;
+
+	setup(() => {
+		model = new ViewModel();
+	});
+
+	teardown(() => {
+		model = null;
+	});
+
+	test('focused stack frame', () => {
+		assert.equal(model.getFocusedStackFrame(), null);
+		assert.equal(model.getFocusedThreadId(), 0);
+		const frame = new StackFrame(1, 1, null, 'app.js', 1, 1);
+		model.setFocusedStackFrame(frame);
+
+		assert.equal(model.getFocusedStackFrame(), frame);
+		assert.equal(model.getFocusedThreadId(), 1);
+	});
+
+	test('selected expression', () => {
+		assert.equal(model.getSelectedExpression(), null);
+		const expression = new Expression('my expression', false);
+		model.setSelectedExpression(expression);
+
+		assert.equal(model.getSelectedExpression(), expression);
+	});
+});