Extract `FakeKlass` in `relation_test.rb` and `relation/mutation_test.rb`

`FakeKlass` in `relation_test.rb` and `relation/mutation_test.rb` are
almost the same.

1 files changed, 32 insertions, 0 deletions

diff --git a/activerecord/test/models/post.rb b/activerecord/test/models/post.rb
index ed64e0ee52..a99ab12b19 100644
--- a/activerecord/test/models/post.rb
+++ b/activerecord/test/models/post.rb
@@ -276,3 +276,35 @@ end
 
 class SubConditionalStiPost < ConditionalStiPost
 end
+
+class FakeKlass
+  extend ActiveRecord::Delegation::DelegateCache
+
+  inherited self
+
+  class << self
+    def connection
+      Post.connection
+    end
+
+    def table_name
+      "posts"
+    end
+
+    def attribute_alias?(name)
+      false
+    end
+
+    def sanitize_sql(sql)
+      sql
+    end
+
+    def sanitize_sql_for_order(sql)
+      sql
+    end
+
+    def arel_attribute(name, table)
+      table[name]
+    end
+  end
+end