From 7630389829e2480db00c6ec356efdb98d9f23e95 Mon Sep 17 00:00:00 2001
From: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Date: Wed, 20 Dec 2023 08:53:22 +0100
Subject: [PATCH] fix: helpful error if solution missing (#52603)

---
 curriculum/test/test-challenges.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/curriculum/test/test-challenges.js b/curriculum/test/test-challenges.js
index 60549326a24..29e65636f69 100644
--- a/curriculum/test/test-challenges.js
+++ b/curriculum/test/test-challenges.js
@@ -466,6 +466,22 @@ function populateTestsForLang({ lang, challenges, meta }) {
 
             if (nextChallenge) {
               const solutionFiles = cloneDeep(nextChallenge.challengeFiles);
+              if (!solutionFiles) {
+                throw Error(
+                  `No solution found. 
+Check the next challenge (${nextChallenge.title}): it should have a seed which solves the current challenge.
+For example:
+
+# --seed--
+
+## --seed-contents--
+
+\`\`\`js
+seed goes here
+\`\`\`
+                  `
+                );
+              }
               const solutionFilesWithEditableContents = solutionFiles.map(
                 file => ({
                   ...file,