Use NODE_ENV to test for test environment; improve scripts

jest.config.integ.cjs

@@ -1,19 +1,5 @@
 console.log("Jest config file read.");
 
-// const { spawn } = require("child_process");
-
-// const ls = spawn('ls', ['-lh', './test']);
-
-// ls.stdout.on('data', (data) => { console.log(`stdout: ${data}`); });
-
-// ls.stderr.on('data', (data) => {
-//   console.error(`stderr: ${data}`);
-// });
-
-// ls.on('close', (code) => {
-//   console.log(`child process exited with code ${code}`);
-// });
-
 module.exports = {
   globalSetup: "./test/integration/setup.cjs",
   globalTeardown: "./test/integration/teardown.cjs",