1 files changed, 27 insertions, 0 deletions
diff --git a/jstests/libs/check_uuids.js b/jstests/libs/check_uuids.js
new file mode 100644
index 00000000000..1eb5f748834
--- /dev/null
+++ b/jstests/libs/check_uuids.js
@@ -0,0 +1,27 @@
+// Contains helpers for checking UUIDs on collections.
+
+/**
+ * Verifies that all collections on all databases on the server with admin database adminDB have
+ * UUIDs if isDowngrade is false and don't have UUIDs if isDowngrade is true.
+ */
+function checkCollectionUUIDs(adminDB, isDowngrade) {
+    let databaseList = adminDB.runCommand({"listDatabases": 1}).databases;
+
+    databaseList.forEach(function(database) {
+        let currentDatabase = adminDB.getSiblingDB(database.name);
+        let collectionInfos = currentDatabase.getCollectionInfos();
+        for (let i = 0; i < collectionInfos.length; i++) {
+            // Always skip system.indexes due to SERVER-30500.
+            if (collectionInfos[i].name == "system.indexes") {
+                continue;
+            }
+            if (isDowngrade) {
+                assert(!collectionInfos[i].info.uuid,
+                       "Unexpected uuid for collection: " + tojson(collectionInfos[i]));
+            } else {
+                assert(collectionInfos[i].info.uuid,
+                       "Expect uuid for collection: " + tojson(collectionInfos[i]));
+            }
+        }
+    });
+}