From 3b645fd3ed60c682b255bf31e7df08cfc6a37321 Mon Sep 17 00:00:00 2001
From: Matthew Draper <matthew@trebex.net>
Date: Thu, 19 Dec 2013 01:43:02 +1030
Subject: Terminate the backend ourselves on PG 9.2+

This should make it harder to accidentally break this test.
---
 .../cases/adapters/postgresql/connection_test.rb   | 48 +++++++++++++---------
 1 file changed, 29 insertions(+), 19 deletions(-)

diff --git a/activerecord/test/cases/adapters/postgresql/connection_test.rb b/activerecord/test/cases/adapters/postgresql/connection_test.rb
index 90cca7d3e6..4715fa002d 100644
--- a/activerecord/test/cases/adapters/postgresql/connection_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/connection_test.rb
@@ -91,40 +91,50 @@ module ActiveRecord
       assert_operator plan.length, :>, 0
     end
 
-    # Must have with_manual_interventions set to true for this
-    # test to run.
+    # Must have PostgreSQL >= 9.2, or with_manual_interventions set to
+    # true for this test to run.
+    #
     # When prompted, restart the PostgreSQL server with the
     # "-m fast" option or kill the individual connection assuming
     # you know the incantation to do that.
     # To restart PostgreSQL 9.1 on OS X, installed via MacPorts, ...
     # sudo su postgres -c "pg_ctl restart -D /opt/local/var/db/postgresql91/defaultdb/ -m fast"
-    if ARTest.config['with_manual_interventions']
-      def test_reconnection_after_actual_disconnection_with_verify
-        original_connection_pid = @connection.query('select pg_backend_pid()')
+    def test_reconnection_after_actual_disconnection_with_verify
+      original_connection_pid = @connection.query('select pg_backend_pid()')
 
-        # Sanity check.
-        assert @connection.active?
+      # Sanity check.
+      assert @connection.active?
 
+      if @connection.send(:postgresql_version) >= 90200
+        secondary_connection = ActiveRecord::Base.connection_pool.checkout
+        secondary_connection.query("select pg_terminate_backend(#{original_connection_pid.first.first})")
+        ActiveRecord::Base.connection_pool.checkin(secondary_connection)
+      elsif ARTest.config['with_manual_interventions']
         puts 'Kill the connection now (e.g. by restarting the PostgreSQL ' +
           'server with the "-m fast" option) and then press enter.'
         $stdin.gets
+      else
+        # We're not capable of terminating the backend ourselves, and
+        # we're not allowed to seek assistance; bail out without
+        # actually testing anything.
+        return
+      end
 
-        @connection.verify!
+      @connection.verify!
 
-        assert @connection.active?
+      assert @connection.active?
 
-        # If we get no exception here, then either we re-connected successfully, or
-        # we never actually got disconnected.
-        new_connection_pid = @connection.query('select pg_backend_pid()')
+      # If we get no exception here, then either we re-connected successfully, or
+      # we never actually got disconnected.
+      new_connection_pid = @connection.query('select pg_backend_pid()')
 
-        assert_not_equal original_connection_pid, new_connection_pid,
-          "umm -- looks like you didn't break the connection, because we're still " +
-          "successfully querying with the same connection pid."
+      assert_not_equal original_connection_pid, new_connection_pid,
+        "umm -- looks like you didn't break the connection, because we're still " +
+        "successfully querying with the same connection pid."
 
-        # Repair all fixture connections so other tests won't break.
-        @fixture_connections.each do |c|
-          c.verify!
-        end
+      # Repair all fixture connections so other tests won't break.
+      @fixture_connections.each do |c|
+        c.verify!
       end
     end
 
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