3 files changed, 42 insertions, 0 deletions
diff --git a/activerecord/test/support/connection_helper.rb b/activerecord/test/support/connection_helper.rb
new file mode 100644
index 0000000000..4a19e5df44
--- /dev/null
+++ b/activerecord/test/support/connection_helper.rb
@@ -0,0 +1,14 @@
+module ConnectionHelper
+  def run_without_connection
+    original_connection = ActiveRecord::Base.remove_connection
+    yield original_connection
+  ensure
+    ActiveRecord::Base.establish_connection(original_connection)
+  end
+
+  # Used to drop all cache query plans in tests.
+  def reset_connection
+    original_connection = ActiveRecord::Base.remove_connection
+    ActiveRecord::Base.establish_connection(original_connection)
+  end
+end
diff --git a/activerecord/test/support/ddl_helper.rb b/activerecord/test/support/ddl_helper.rb
new file mode 100644
index 0000000000..43cb235e01
--- /dev/null
+++ b/activerecord/test/support/ddl_helper.rb
@@ -0,0 +1,8 @@
+module DdlHelper
+  def with_example_table(connection, table_name, definition = nil)
+    connection.execute("CREATE TABLE #{table_name}(#{definition})")
+    yield
+  ensure
+    connection.execute("DROP TABLE #{table_name}")
+  end
+end
diff --git a/activerecord/test/support/schema_dumping_helper.rb b/activerecord/test/support/schema_dumping_helper.rb
new file mode 100644
index 0000000000..2d1651454d
--- /dev/null
+++ b/activerecord/test/support/schema_dumping_helper.rb
@@ -0,0 +1,20 @@
+module SchemaDumpingHelper
+  def dump_table_schema(table, connection = ActiveRecord::Base.connection)
+    old_ignore_tables = ActiveRecord::SchemaDumper.ignore_tables
+    ActiveRecord::SchemaDumper.ignore_tables = connection.tables - [table]
+    stream = StringIO.new
+    ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
+    stream.string
+  ensure
+    ActiveRecord::SchemaDumper.ignore_tables = old_ignore_tables
+  end
+
+  def dump_all_table_schema(ignore_tables)
+    old_ignore_tables, ActiveRecord::SchemaDumper.ignore_tables = ActiveRecord::SchemaDumper.ignore_tables, ignore_tables
+    stream = StringIO.new
+    ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
+    stream.string
+  ensure
+    ActiveRecord::SchemaDumper.ignore_tables = old_ignore_tables
+  end
+end