test('lookup with null', async () => {
		const configurationRegistry = Registry.as<IConfigurationRegistry>(ConfigurationExtensions.Configuration);
		configurationRegistry.registerConfiguration({
			'id': '_testNull',
			'type': 'object',
			'properties': {
				'lookup.service.testNullSetting': {
					'type': 'null',
				}
			}
		});

		const r = await testFile('config', 'config.json');
		const service = new ConfigurationService(new SettingsTestEnvironmentService(parseArgs(process.argv), process.execPath, r.testFile));
		let res = service.inspect('lookup.service.testNullSetting');
		assert.strictEqual(res.default, null);
		assert.strictEqual(res.value, null);
		assert.strictEqual(res.user, undefined);

		fs.writeFileSync(r.testFile, '{ "lookup.service.testNullSetting": null }');

		await service.reloadConfiguration();

		res = service.inspect('lookup.service.testNullSetting');
		assert.strictEqual(res.default, null);
		assert.strictEqual(res.value, null);
		assert.strictEqual(res.user, null);

		service.dispose();
		return r.cleanUp();
	});

		return testFile('config', 'config.json').then(r => {
			const service = new ConfigurationService(new SettingsTestEnvironmentService(parseArgs(process.argv), process.execPath, r.testFile));

			let res = service.inspect('something.missing');
			assert.strictEqual(res.value, void 0);
			assert.strictEqual(res.default, void 0);
			assert.strictEqual(res.user, void 0);

			res = service.inspect('lookup.service.testSetting');
			assert.strictEqual(res.default, 'isSet');
			assert.strictEqual(res.value, 'isSet');
			assert.strictEqual(res.user, void 0);

			fs.writeFileSync(r.testFile, '{ "lookup.service.testSetting": "bar" }');

			return service.reloadConfiguration().then(() => {
				res = service.inspect('lookup.service.testSetting');
				assert.strictEqual(res.default, 'isSet');
				assert.strictEqual(res.user, 'bar');
				assert.strictEqual(res.value, 'bar');

				service.dispose();

				return r.cleanUp();
			});
		});

function main(server: Server): void {
	const services = new ServiceCollection();

	services.set(IEventService, new SyncDescriptor(EventService));
	services.set(IEnvironmentService, new SyncDescriptor(EnvironmentService, parseArgs(process.argv), process.execPath));
	services.set(IConfigurationService, new SyncDescriptor(ConfigurationService));
	services.set(IRequestService, new SyncDescriptor(RequestService));

	const instantiationService = new InstantiationService(services);

	instantiationService.invokeFunction(accessor => {
		const appenders: AppInsightsAppender[] = [];

		if (product.aiConfig && product.aiConfig.key) {
			appenders.push(new AppInsightsAppender(eventPrefix, null, product.aiConfig.key));
		}

		if (product.aiConfig && product.aiConfig.asimovKey) {
			appenders.push(new AppInsightsAppender(eventPrefix, null, product.aiConfig.asimovKey));
		}

		// It is important to dispose the AI adapter properly because
		// only then they flush remaining data.
		process.once('exit', () => appenders.forEach(a => a.dispose()));

		const appender = combinedAppender(...appenders);
		server.registerChannel('telemetryAppender', new TelemetryAppenderChannel(appender));

		const services = new ServiceCollection();
		const { appRoot, extensionsPath, extensionDevelopmentPath, isBuilt } = accessor.get(IEnvironmentService);

		if (isBuilt && !extensionDevelopmentPath && product.enableTelemetry) {
			const config: ITelemetryServiceConfig = {
				appender,
				commonProperties: resolveCommonProperties(product.commit, pkg.version),
				piiPaths: [appRoot, extensionsPath]
			};

			services.set(ITelemetryService, new SyncDescriptor(TelemetryService, config));
		} else {
			services.set(ITelemetryService, NullTelemetryService);
		}

		services.set(IExtensionManagementService, new SyncDescriptor(ExtensionManagementService));
		services.set(IExtensionGalleryService, new SyncDescriptor(ExtensionGalleryService));

		const instantiationService2 = instantiationService.createChild(services);

		instantiationService2.invokeFunction(accessor => {
			const extensionManagementService = accessor.get(IExtensionManagementService);
			const channel = new ExtensionManagementChannel(extensionManagementService);
			server.registerChannel('extensions', channel);

			// eventually clean up old extensions
			setTimeout(() => (extensionManagementService as ExtensionManagementService).removeDeprecatedExtensions(), 100);
		});
	});
}

export function parseCLIProcessArgv(processArgv: string[]): ParsedArgs {
	let [, , ...args] = processArgv;

	if (process.env['VSCODE_DEV']) {
		args = stripAppPath(args) || [];
	}

	return validate(parseArgs(args));
}

export function parseMainProcessArgv(processArgv: string[]): ParsedArgs {
	let [, ...args] = processArgv;

	// If dev, remove the first non-option argument: it's the app location
	if (process.env['VSCODE_DEV']) {
		args = stripAppPath(args) || [];
	}

	return validate(parseArgs(args));
}

	test('marketplace machine id', () => {
		const args = ['--user-data-dir', marketplaceHome];
		const environmentService = new EnvironmentService(parseArgs(args), process.execPath);

		return resolveMarketplaceHeaders(environmentService).then(headers => {
			assert.ok(isUUID(headers['X-Market-User-Id']));

			return resolveMarketplaceHeaders(environmentService).then(headers2 => {
				assert.equal(headers['X-Market-User-Id'], headers2['X-Market-User-Id']);
			});
		});
	});