SERVER-45143 use default value for 'protocolVersion' field during reconfigs

1 files changed, 23 insertions, 0 deletions

diff --git a/jstests/replsets/reconfig_uses_default_protocolVersion.js b/jstests/replsets/reconfig_uses_default_protocolVersion.js
new file mode 100644
index 00000000000..706872b9522
--- /dev/null
+++ b/jstests/replsets/reconfig_uses_default_protocolVersion.js
@@ -0,0 +1,23 @@
+/**
+ * Test that protocolVersion defaults to 1 even during a replSetReconfig.
+ */
+(function() {
+"use strict";
+
+var rst = new ReplSetTest({nodes: 2});
+rst.startSet();
+rst.initiate();
+
+const primary = rst.getPrimary();
+var config = primary.getDB("local").system.replset.findOne();
+config.version++;
+delete config.protocolVersion;
+
+assert.commandWorked(primary.adminCommand({replSetReconfig: config}));
+
+// Make sure that the config still has the proper protocolVersion.
+config = primary.getDB("local").system.replset.findOne();
+assert.eq(config.protocolVersion, 1);
+
+rst.stopSet();
+})();
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