chore(tools): test intro file structure (#50175)

client/i18n/locales.test.ts

@@ -1,9 +1,24 @@
 import fs from 'fs';
 import { setup } from 'jest-json-schema-extended';
 import { availableLangs, LangNames, LangCodes } from '../../config/i18n';
+import { SuperBlocks } from '../../config/certification-settings';
+import intro from './locales/english/intro.json';
 
 setup();
 
+interface Intro {
+  [key: string]: {
+    title: string;
+    intro: string[];
+    blocks: {
+      [block: string]: {
+        title: string;
+        intro: string[];
+      };
+    };
+  };
+}
+
 const filesThatShouldExist = [
   {
     name: 'translations.json'
@@ -53,3 +68,18 @@ describe('Locale tests:', () => {
     });
   });
 });
+
+describe('Intro file structure tests:', () => {
+  const typedIntro = intro as unknown as Intro;
+  const superblocks = Object.values(SuperBlocks);
+  for (const superBlock of superblocks) {
+    expect(typeof typedIntro[superBlock].title).toBe('string');
+    expect(typedIntro[superBlock].intro).toBeInstanceOf(Array);
+    expect(typedIntro[superBlock].blocks).toBeInstanceOf(Object);
+    const blocks = Object.keys(typedIntro[superBlock].blocks);
+    blocks.forEach(block => {
+      expect(typeof typedIntro[superBlock].blocks[block].title).toBe('string');
+      expect(typedIntro[superBlock].blocks[block].intro).toBeInstanceOf(Array);
+    });
+  }
+});