SERVER-24883 cloner should not create _id index when original collection doesn't have one

1 files changed, 23 insertions, 0 deletions

diff --git a/jstests/core/copydatabase_no_id_index.js b/jstests/core/copydatabase_no_id_index.js
new file mode 100644
index 00000000000..2cd1225d78b
--- /dev/null
+++ b/jstests/core/copydatabase_no_id_index.js
@@ -0,0 +1,23 @@
+/**
+ * This test creates a collection with autoIndexId: false. It then copies the database and expects
+ * the new collection to not have an _id index either.
+ */
+
+(function() {
+    "use strict";
+    var db1 = db.getSiblingDB('copydatabase_no_id_index');
+    var db2 = db.getSiblingDB('copydatabase_no_id_index2');
+    db1.dropDatabase();
+    db2.dropDatabase();
+
+    assert.commandWorked(db1.runCommand({create: 'foo', autoIndexId: false}));
+    assert.writeOK(db1.foo.insert({a: 1}));
+    assert.eq(db1.foo.getIndexes().length, 0);
+
+    assert.commandWorked(db1.copyDatabase('copydatabase_no_id_index', 'copydatabase_no_id_index2'));
+
+    assert.eq(db1.foo.count(), 1);
+    assert.eq(db1.foo.getIndexes().length, 0);
+    assert.eq(db2.foo.count(), 1);
+    assert.eq(db2.foo.getIndexes().length, 0);
+})();
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