1 files changed, 50 insertions, 0 deletions
diff --git a/jstests/sharding/out_to_non_existing.js b/jstests/sharding/out_to_non_existing.js
new file mode 100644
index 00000000000..d3aab05e112
--- /dev/null
+++ b/jstests/sharding/out_to_non_existing.js
@@ -0,0 +1,50 @@
+// Tests for $out with a non-existing target collection.
+(function() {
+    "use strict";
+
+    const st = new ShardingTest({shards: 2, rs: {nodes: 1}});
+
+    const mongosDB = st.s0.getDB(jsTestName());
+    const mongosColl = mongosDB[jsTestName()];
+    const mongosTargetColl = mongosDB[jsTestName() + "_out"];
+
+    function testOut(sourceColl, targetColl, shardedSource) {
+        jsTestLog("Testing $out to non-existent target collection (source collection sharded : " +
+                  shardedSource + ").");
+        sourceColl.drop();
+        targetColl.drop();
+
+        if (shardedSource) {
+            st.shardColl(sourceColl, {_id: 1}, {_id: 0}, {_id: 1}, mongosDB.getName());
+        }
+
+        for (let i = 0; i < 10; i++) {
+            assert.commandWorked(sourceColl.insert({_id: i}));
+        }
+
+        // Test the behavior for each of the $out modes. Since the target collection does not exist,
+        // the behavior should be identical.
+        ["insertDocuments", "replaceDocuments", "replaceCollection"].forEach(mode => {
+            targetColl.drop();
+            sourceColl.aggregate([{$out: {to: targetColl.getName(), mode: mode}}]);
+            assert.eq(10, targetColl.find().itcount());
+        });
+
+        // Test with legacy syntax, which should behave identical to mode "replaceCollection".
+        targetColl.drop();
+        sourceColl.aggregate([{$out: targetColl.getName()}]);
+        assert.eq(10, targetColl.find().itcount());
+    }
+
+    //
+    // Test with unsharded source collection to a non-existent target collection.
+    //
+    testOut(mongosColl, mongosTargetColl, false);
+
+    //
+    // Test with sharded source collection to a non-existent target collection.
+    //
+    testOut(mongosColl, mongosTargetColl, true);
+
+    st.stop();
+}());