added unit testing, and started implementing unit tests...phew

node_modules/mocha/lib/cli/node-flags.js

@@ -0,0 +1,85 @@
+'use strict';
+
+/**
+ * Some settings and code related to Mocha's handling of Node.js/V8 flags.
+ * @private
+ * @module
+ */
+
+const nodeFlags = require('node-environment-flags');
+const unparse = require('yargs-unparser');
+
+/**
+ * These flags are considered "debug" flags.
+ * @see {@link impliesNoTimeouts}
+ * @private
+ */
+const debugFlags = new Set(['debug', 'debug-brk', 'inspect', 'inspect-brk']);
+
+/**
+ * Mocha has historical support for various `node` and V8 flags which might not
+ * appear in `process.allowedNodeEnvironmentFlags`.
+ * These include:
+ *   - `--preserve-symlinks`
+ *   - `--harmony-*`
+ *   - `--gc-global`
+ *   - `--trace-*`
+ *   - `--es-staging`
+ *   - `--use-strict`
+ *   - `--v8-*` (but *not* `--v8-options`)
+ * @summary Whether or not to pass a flag along to the `node` executable.
+ * @param {string} flag - Flag to test
+ * @param {boolean} [bareword=true] - If `false`, we expect `flag` to have one or two leading dashes.
+ * @returns {boolean} If the flag is considered a "Node" flag.
+ * @private
+ */
+exports.isNodeFlag = (flag, bareword = true) => {
+  if (!bareword) {
+    // check if the flag begins with dashes; if not, not a node flag.
+    if (!/^--?/.test(flag)) {
+      return false;
+    }
+    // strip the leading dashes to match against subsequent checks
+    flag = flag.replace(/^--?/, '');
+  }
+  return (
+    // treat --require/-r as Mocha flag even though it's also a node flag
+    !(flag === 'require' || flag === 'r') &&
+    // check actual node flags from `process.allowedNodeEnvironmentFlags`,
+    // then historical support for various V8 and non-`NODE_OPTIONS` flags
+    // and also any V8 flags with `--v8-` prefix
+    (nodeFlags.has(flag) ||
+      debugFlags.has(flag) ||
+      /(?:preserve-symlinks(?:-main)?|harmony(?:[_-]|$)|(?:trace[_-].+$)|gc(?:[_-]global)?$|es[_-]staging$|use[_-]strict$|v8[_-](?!options).+?$)/.test(
+        flag
+      ))
+  );
+};
+
+/**
+ * Returns `true` if the flag is a "debug-like" flag.  These require timeouts
+ * to be suppressed, or pausing the debugger on breakpoints will cause test failures.
+ * @param {string} flag - Flag to test
+ * @returns {boolean}
+ * @private
+ */
+exports.impliesNoTimeouts = flag => debugFlags.has(flag);
+
+/**
+ * All non-strictly-boolean arguments to node--those with values--must specify those values using `=`, e.g., `--inspect=0.0.0.0`.
+ * Unparse these arguments using `yargs-unparser` (which would result in `--inspect 0.0.0.0`), then supply `=` where we have values.
+ * There's probably an easier or more robust way to do this; fixes welcome
+ * @param {Object} opts - Arguments object
+ * @returns {string[]} Unparsed arguments using `=` to specify values
+ * @private
+ */
+exports.unparseNodeFlags = opts => {
+  var args = unparse(opts);
+  return args.length
+    ? args
+        .join(' ')
+        .split(/\b/)
+        .map(arg => (arg === ' ' ? '=' : arg))
+        .join('')
+    : [];
+};