Add test & documentation for replicationStart message

Author: brianc

CHANGELOG.md

@@ -4,6 +4,10 @@ For richer information consult the commit log on github with referenced pull req
 
 We do not include break-fix version release in this file.
 
+### v6.2.0
+
+- Add support for [parsing `replicationStart` messages](https://github.com/brianc/node-postgres/pull/1271/files).
+
 ### v6.1.0
 
 - Add optional callback parameter to the pure JavaScript `client.end` method.  The native client already supported this.

test/unit/connection/inbound-parser-tests.js

@@ -347,6 +347,13 @@ test('Connection', function() {
       name: 'portalSuspended'
     });
   });
+
+  test('parses replication start message', function() {
+    testForMessage(new Buffer([0x57, 0x00, 0x00, 0x00, 0x04]), {
+      name: 'replicationStart',
+      length: 4
+    });
+  });
 });
 
 //since the data message on a stream can randomly divide the incomming
@@ -465,5 +472,4 @@ test('split buffer, multiple message parsing', function() {
       splitAndVerifyTwoMessages(1);
     });
   });
-
 });