Make method name more consistent

lib/command.js

@@ -1095,13 +1095,15 @@ Expecting one of '${allowedValues.join("', '")}'`);
   }
 
   /**
-   * Note: masked in some unit tests.
+   * Throw if expected executable is missing. Add lots of help for author.
+   *
    * @param {string} executableFile
    * @param {string} executableDir
    * @param {string} subcommandName
    */
-  _throwForMissingExecutable(executableFile, executableDir, subcommandName) {
+  _checkForMissingExecutable(executableFile, executableDir, subcommandName) {
     if (fs.existsSync(executableFile)) return;
+
     const executableDirMessage = executableDir
       ? `searched for local subcommand relative to directory '${executableDir}'`
       : 'no directory for search for local subcommand, use .executableDir() to supply a custom directory';
@@ -1195,7 +1197,7 @@ Expecting one of '${allowedValues.join("', '")}'`);
         proc = childProcess.spawn(executableFile, args, { stdio: 'inherit' });
       }
     } else {
-      this._throwForMissingExecutable(
+      this._checkForMissingExecutable(
         executableFile,
         executableDir,
         subcommand._name,
@@ -1238,7 +1240,7 @@ Expecting one of '${allowedValues.join("', '")}'`);
     proc.on('error', (err) => {
       // @ts-ignore: because err.code is an unknown property
       if (err.code === 'ENOENT') {
-        this._throwForMissingExecutable(
+        this._checkForMissingExecutable(
           executableFile,
           executableDir,
           subcommand._name,