SERVER-42484 Add test to ensure we are inside a WriteUnitOfWork when writing index keys during initial sync collection cloning

(cherry picked from commit c41af3e315a115b04a53706837d36a729d174fc3)

1 files changed, 35 insertions, 0 deletions

diff --git a/jstests/replsets/initial_sync_clone_multikey.js b/jstests/replsets/initial_sync_clone_multikey.js
new file mode 100644
index 00000000000..8353780ccba
--- /dev/null
+++ b/jstests/replsets/initial_sync_clone_multikey.js
@@ -0,0 +1,35 @@
+/**
+ * Test initial sync cloning of a collection that contains a multikey index.
+ */
+(function() {
+    "use strict";
+
+    const replTest = new ReplSetTest({nodes: 1});
+    replTest.startSet();
+    replTest.initiate();
+
+    const dbName = jsTest.name();
+    const collName = "test";
+
+    const primary = replTest.getPrimary();
+    const primaryDB = primary.getDB(dbName);
+
+    jsTestLog("Creating the collection and an index.");
+    assert.commandWorked(primaryDB.createCollection(collName));
+    assert.commandWorked(primaryDB[collName].createIndex({"x": 1}, {background: true}));
+
+    // Make the index multikey.
+    primaryDB[collName].insert({x: [1, 2]});
+
+    jsTestLog("Adding a secondary node to do the initial sync.");
+    replTest.add();
+
+    jsTestLog("Re-initiating replica set with the new secondary.");
+    replTest.reInitiate();
+
+    // Wait until initial sync completes.
+    jsTestLog("Waiting until initial sync completes.");
+    replTest.awaitSecondaryNodes();
+    replTest.awaitReplication();
+    replTest.stopSet();
+})();