build: Allow specifying a single file to validate (#2369)

CONTRIBUTING.md

@@ -56,7 +56,7 @@ To make sure that files are validated against your schema correctly (we strongly
 
 1. Create a subfolder in [`src/test`](src/test) named as your schema file
 2. Create one or more `.json, .yml or .yaml` files in that folder
-3. Run `npm run build`
+3. Run `npm run build` (to test a single schema, use `npm run build -- --SchemaName=<jsonFileName.json> default`)
 
 If the build succeeds, your changes are valid and you can safely create a PR.
 

src/Gruntfile.cjs

@@ -119,6 +119,11 @@ module.exports = function (grunt) {
       skipReadFile = true,
       processOnlyThisOneSchemaFile = undefined
     } = {}) {
+    const schemaNameOption = grunt.option('SchemaName')
+    if (processOnlyThisOneSchemaFile === undefined && schemaNameOption) {
+      processOnlyThisOneSchemaFile = schemaNameOption
+    }
+
     /**
      * @summary Check if the present json schema file must be tested or not
      * @param {string} jsonFilename