test that we allow nil to be passed into table_exists? (details at #460)

Author: kares

lib/arjdbc/db2/as400.rb

@@ -91,9 +91,8 @@ def execute_and_auto_confirm(sql, name = nil)
 
     # disable all schemas browsing when default schema is specified
     def table_exists?(name)
-      schema ?
-        @connection.table_exists?(name, schema) :
-          @connection.table_exists?(name)
+      return false unless name
+      schema ? @connection.table_exists?(name, schema) : @connection.table_exists?(name)
     end
 
     DRIVER_NAME = 'com.ibm.as400.access.AS400JDBCDriver'.freeze

test/simple.rb

@@ -195,6 +195,7 @@ def test_tables
   def test_table_exists?
     assert_true  ActiveRecord::Base.connection.table_exists? 'entries'
     assert_false ActiveRecord::Base.connection.table_exists? 'blahbls'
+    assert ! ActiveRecord::Base.connection.table_exists?(nil)
   end
 
   def test_entries_empty