Updates for build to suit VSTS automation

- extend IS_CI_SERVER to include TF_BUILD env var (present on VSTS)
- update 'useColor' parameter to mocha to take into account VSTS.

Author: d3r3kk

src/test/constants.ts

@@ -1,16 +1,16 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-// tslint:disable:no-string-literal
 import { workspace } from 'vscode';
 import { PythonSettings } from '../client/common/configSettings';
 
-export const IS_APPVEYOR = process.env['APPVEYOR'] === 'true';
-export const IS_TRAVIS = process.env['TRAVIS'] === 'true';
-export const IS_CI_SERVER = IS_TRAVIS || IS_APPVEYOR;
+export const IS_APPVEYOR = process.env.APPVEYOR === 'true';
+export const IS_TRAVIS = process.env.TRAVIS === 'true';
+export const IS_VSTS = process.env.TF_BUILD === 'true';
+export const IS_CI_SERVER = IS_TRAVIS || IS_APPVEYOR || IS_VSTS;
 export const TEST_TIMEOUT = 25000;
 export const IS_MULTI_ROOT_TEST = isMultitrootTest();
-export const IS_CI_SERVER_TEST_DEBUGGER = process.env['IS_CI_SERVER_TEST_DEBUGGER'] === '1';
+export const IS_CI_SERVER_TEST_DEBUGGER = process.env.IS_CI_SERVER_TEST_DEBUGGER === '1';
 // If running on CI server, then run debugger tests ONLY if the corresponding flag is enabled.
 export const TEST_DEBUGGER = IS_CI_SERVER ? IS_CI_SERVER_TEST_DEBUGGER : true;
 
@@ -19,4 +19,4 @@ function isMultitrootTest() {
 }
 
 export const IS_ANALYSIS_ENGINE_TEST =
-    !IS_TRAVIS && (process.env['VSC_PYTHON_ANALYSIS'] === '1' || !PythonSettings.getInstance().jediEnabled);
+    !IS_TRAVIS && (process.env.VSC_PYTHON_ANALYSIS === '1' || !PythonSettings.getInstance().jediEnabled);

src/test/index.ts

@@ -4,7 +4,8 @@ if ((Reflect as any).metadata === undefined) {
     require('reflect-metadata');
 }
 import { MochaSetupOptions } from 'vscode/lib/testrunner';
-import { IS_CI_SERVER, IS_CI_SERVER_TEST_DEBUGGER, IS_MULTI_ROOT_TEST } from './constants';
+import { IS_CI_SERVER, IS_CI_SERVER_TEST_DEBUGGER,
+         IS_MULTI_ROOT_TEST, IS_VSTS } from './constants';
 import * as testRunner from './testRunner';
 
 process.env.VSC_PYTHON_CI_TEST = '1';
@@ -20,7 +21,7 @@ const grep = IS_CI_SERVER && IS_CI_SERVER_TEST_DEBUGGER ? 'Debug' : undefined;
 // Hack, as retries is not supported as setting in tsd.
 const options: MochaSetupOptions & { retries: number } = {
     ui: 'tdd',
-    useColors: true,
+    useColors: !IS_VSTS,
     timeout: 25000,
     retries: 3,
     grep