1 files changed, 63 insertions, 0 deletions
diff --git a/jstests/noPassthrough/collmod_disallow_duplicates_step_up.js b/jstests/noPassthrough/collmod_disallow_duplicates_step_up.js
new file mode 100644
index 00000000000..9d6908e3590
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+++ b/jstests/noPassthrough/collmod_disallow_duplicates_step_up.js
@@ -0,0 +1,63 @@
+/**
+ * Tests that the collMod command disallows writes that introduce new duplicate keys and the option
+ * is persisted on all nodes in the replica set.
+ *
+ * @tags: [
+ *  # TODO(SERVER-61181): Fix validation errors under ephemeralForTest.
+ *  incompatible_with_eft,
+ *  # TODO(SERVER-61182): Fix WiredTigerKVEngine::alterIdentMetadata() under inMemory.
+ *  requires_persistence,
+ *  # Replication requires journaling support so this tag also implies exclusion from
+ *  # --nojournal test configurations.
+ *  requires_replication,
+ * ]
+ */
+
+(function() {
+'use strict';
+
+const rst = new ReplSetTest({nodes: 3});
+rst.startSet();
+rst.initiate();
+
+const primary = rst.getPrimary();
+const [secondary, _] = rst.getSecondaries();
+const collModIndexUniqueEnabled =
+    assert.commandWorked(primary.adminCommand({getParameter: 1, featureFlagCollModIndexUnique: 1}))
+        .featureFlagCollModIndexUnique.value;
+
+if (!collModIndexUniqueEnabled) {
+    jsTestLog('Skipping test because the collMod unique index feature flag is disabled');
+    rst.stopSet();
+    return;
+}
+
+const collName = 'collmod_disallow_duplicates_step_up';
+const db_primary = primary.getDB('test');
+const coll_primary = db_primary.getCollection(collName);
+const db_secondary = secondary.getDB('test');
+const coll_secondary = db_secondary.getCollection(collName);
+
+// Sets 'disallowNewDuplicateKeys' on the old primary and checks that the index rejects duplicates.
+coll_primary.drop();
+assert.commandWorked(coll_primary.createIndex({a: 1}));
+assert.commandWorked(coll_primary.insert({_id: 0, a: 1}));
+assert.commandWorked(db_primary.runCommand(
+    {collMod: collName, index: {keyPattern: {a: 1}, disallowNewDuplicateKeys: true}}));
+assert.commandFailedWithCode(coll_primary.insert({_id: 1, a: 1}), ErrorCodes.DuplicateKey);
+
+// Steps up a new primary and checks the index spec is replicated.
+rst.stepUp(secondary);
+assert.commandFailedWithCode(coll_secondary.insert({_id: 1, a: 1}), ErrorCodes.DuplicateKey);
+
+// Converts the index to unique on the new primary.
+assert.commandWorked(
+    db_secondary.runCommand({collMod: collName, index: {keyPattern: {a: 1}, unique: true}}));
+
+const uniqueIndexes = coll_secondary.getIndexes().filter(function(doc) {
+    return doc.unique && friendlyEqual(doc.key, {a: 1});
+});
+assert.eq(1, uniqueIndexes.length);
+
+rst.stopSet();
+})();
+\ No newline at end of file