extension/test/runTest.ts: disable D-Bus comm for test execution

This suppresses the "Failed to connect to the bus" error.

Change-Id: Ie193b92085906121ba337bcf4a3af4428c87b31e
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/619716
kokoro-CI: kokoro <[email protected]>
Commit-Queue: Hyang-Ah Hana Kim <[email protected]>
Reviewed-by: Hongxiang Jiang <[email protected]>

Author: hyangah

extension/test/runTest.ts

@@ -4,6 +4,9 @@ import * as path from 'path';
 import { SilentReporter, runTests } from '@vscode/test-electron';
 
 async function main() {
+	// Disable chatty electron's DBUS errors by unsetting this env var.
+	// DBUS is not required. https://github.com/microsoft/vscode-test/issues/127
+	process.env['DBUS_SESSION_BUS_ADDRESS'] = '';
 	// Use the local toolchain by default
 	// instead of getting affected by the extension/go.mod go or toolchain directives.
 	process.env['GOTOOLCHAIN'] = 'local';