message: test: add test for env variable startup of apprunner
diff: @@ -290,6 +290,43 @@ describe('AppRunner', (): void => {
  expect(app.start).toHaveBeenLastCalledWith();
  });
  + it('runs the server honoring env variables.', async(): Promise<void> => {
  + // Set logging level to debug
  + const { env } = process;
  + const OLD_STATE = env.CSS_LOGGING_LEVEL;
  + env.CSS_LOGGING_LEVEL = 'debug';
  + await expect(new AppRunner().runCli([ 'node', 'script' ])).resolves.toBeUndefined();
  +
  + expect(ComponentsManager.build).toHaveBeenCalledTimes(1);
  + // Check logLevel to be set to debug instead of default `info`
  + expect(ComponentsManager.build).toHaveBeenCalledWith({
  + dumpErrorState: true,
  + logLevel: 'debug',
  + mainModulePath: joinFilePath(__dirname, '../../../'),
  + });
  + expect(manager.configRegistry.register).toHaveBeenCalledTimes(1);
  + expect(manager.configRegistry.register)
  + .toHaveBeenCalledWith(joinFilePath(__dirname, '/../../../config/default.json'));
  + expect(manager.instantiate).toHaveBeenCalledTimes(2);
  + expect(manager.instantiate).toHaveBeenNthCalledWith(1, 'urn:solid-server-app-setup:default:CliResolver', {});
  + expect(cliExtractor.handleSafe).toHaveBeenCalledTimes(1);
  + expect(cliExtractor.handleSafe).toHaveBeenCalledWith([ 'node', 'script' ]);
  + expect(settingsResolver.handleSafe).toHaveBeenCalledTimes(1);
  + expect(settingsResolver.handleSafe).toHaveBeenCalledWith(defaultParameters);
  + expect(manager.instantiate).toHaveBeenNthCalledWith(2,
  + 'urn:solid-server:default:App',
  + { variables: defaultVariables });
  + expect(app.start).toHaveBeenCalledTimes(1);
  + expect(app.start).toHaveBeenLastCalledWith();
  +
  + // Reset env
  + if (OLD_STATE) {
  + env.CSS_LOGGING_LEVEL = OLD_STATE;
  + } else {
  + delete env.CSS_LOGGING_LEVEL;
  + }
  + });
  +
  it('throws an error if the server could not start.', async(): Promise<void> => {
  app.start.mockRejectedValueOnce(new Error('Fatal'));
  