1 files changed, 25 insertions, 0 deletions
diff --git a/activerecord/test/cases/adapters/postgresql/explain_test.rb b/activerecord/test/cases/adapters/postgresql/explain_test.rb
new file mode 100644
index 0000000000..0d599ed37f
--- /dev/null
+++ b/activerecord/test/cases/adapters/postgresql/explain_test.rb
@@ -0,0 +1,25 @@
+require "cases/helper"
+require 'models/developer'
+
+module ActiveRecord
+  module ConnectionAdapters
+    class PostgreSQLAdapter
+      class ExplainTest < ActiveRecord::TestCase
+        fixtures :developers
+
+        def test_explain_for_one_query
+          explain = Developer.where(:id => 1).explain
+          assert_match %(QUERY PLAN), explain
+          assert_match %(Index Scan using developers_pkey on developers), explain
+        end
+
+        def test_explain_with_eager_loading
+          explain = Developer.where(:id => 1).includes(:audit_logs).explain
+          assert_match %(QUERY PLAN), explain
+          assert_match %(Index Scan using developers_pkey on developers), explain
+          assert_match %(Seq Scan on audit_logs), explain
+        end
+      end
+    end
+  end
+end