Allow database specific locking clauses to be used

2 files changed, 23 insertions, 9 deletions

diff --git a/test/visitors/test_mysql.rb b/test/visitors/test_mysql.rb
index c3b79ca667..c22cbaff19 100644
--- a/test/visitors/test_mysql.rb
+++ b/test/visitors/test_mysql.rb
@@ -29,11 +29,16 @@ module Arel
         sql.must_be_like "SELECT FROM DUAL"
       end
 
-      it 'uses FOR UPDATE when locking' do
-        stmt = Nodes::SelectStatement.new
-        stmt.lock = Nodes::Lock.new
-        sql = @visitor.accept(stmt)
-        sql.must_be_like "SELECT FROM DUAL FOR UPDATE"
+      describe 'locking' do
+        it 'defaults to FOR UPDATE when locking' do
+          node = Nodes::Lock.new
+          @visitor.accept(node).must_be_like "FOR UPDATE"
+        end
+
+        it 'allows a custom string to be used as a lock' do
+          node = Nodes::Lock.new('LOCK IN SHARE MODE')
+          @visitor.accept(node).must_be_like "LOCK IN SHARE MODE"
+        end
       end
     end
   end
diff --git a/test/visitors/test_postgres.rb b/test/visitors/test_postgres.rb
index 6e8f399b6b..ec55e555a6 100644
--- a/test/visitors/test_postgres.rb
+++ b/test/visitors/test_postgres.rb
@@ -7,10 +7,19 @@ module Arel
         @visitor = PostgreSQL.new Table.engine
       end
 
-      it 'should produce a lock value' do
-        @visitor.accept(Nodes::Lock.new).must_be_like %{
-          FOR UPDATE
-        }
+      describe 'locking' do
+        it 'defaults to FOR UPDATE' do
+          @visitor.accept(Nodes::Lock.new).must_be_like %{
+            FOR UPDATE
+          }
+        end
+
+        it 'allows a custom string to be used as a lock' do
+          node = Nodes::Lock.new('FOR SHARE')
+          @visitor.accept(node).must_be_like %{
+            FOR SHARE
+          }
+        end
       end
 
       it "should escape LIMIT" do