1 files changed, 51 insertions, 0 deletions
diff --git a/activerecord/test/active_record/connection_adapters/fake_adapter.rb b/activerecord/test/active_record/connection_adapters/fake_adapter.rb
new file mode 100644
index 0000000000..f977b2997b
--- /dev/null
+++ b/activerecord/test/active_record/connection_adapters/fake_adapter.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+module ActiveRecord
+  module ConnectionHandling
+    def fake_connection(config)
+      ConnectionAdapters::FakeAdapter.new nil, logger
+    end
+  end
+
+  module ConnectionAdapters
+    class FakeAdapter < AbstractAdapter
+      attr_accessor :data_sources, :primary_keys
+
+      @columns = Hash.new { |h, k| h[k] = [] }
+      class << self
+        attr_reader :columns
+      end
+
+      def initialize(connection, logger)
+        super
+        @data_sources = []
+        @primary_keys = {}
+        @columns      = self.class.columns
+      end
+
+      def primary_key(table)
+        @primary_keys[table] || "id"
+      end
+
+      def merge_column(table_name, name, sql_type = nil, options = {})
+        @columns[table_name] << ActiveRecord::ConnectionAdapters::Column.new(
+          name.to_s,
+          options[:default],
+          fetch_type_metadata(sql_type),
+          options[:null])
+      end
+
+      def columns(table_name)
+        @columns[table_name]
+      end
+
+      def data_source_exists?(*)
+        true
+      end
+
+      def active?
+        true
+      end
+    end
+  end
+end