From 0afd789761b6d27e1aae3a96616ad16c49f25486 Mon Sep 17 00:00:00 2001
From: David Bruant <davidbruant@protonmail.com>
Date: Tue, 7 Apr 2020 10:58:17 +0200
Subject: [PATCH] fix(zoe): improve assertSubset error message

---
 packages/zoe/src/objArrayConversion.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/zoe/src/objArrayConversion.js b/packages/zoe/src/objArrayConversion.js
index fd5cd31dba8..d69b6a43e5f 100644
--- a/packages/zoe/src/objArrayConversion.js
+++ b/packages/zoe/src/objArrayConversion.js
@@ -22,7 +22,12 @@ export const objToArray = (obj, keywords) => {
 export const assertSubset = (whole, part) => {
   part.forEach(key => {
     assert.typeof(key, 'string');
-    assert(whole.includes(key), details`key ${key} was not an expected key`);
+    assert(
+      whole.includes(key),
+      details`key ${key} was not one of the expected keys (${whole.join(
+        ', ',
+      )})`,
+    );
   });
 };