1 files changed, 39 insertions, 0 deletions
diff --git a/activerecord/test/cases/adapters/mysql2/schema_migrations_test.rb b/activerecord/test/cases/adapters/mysql2/schema_migrations_test.rb
new file mode 100644
index 0000000000..9c49599d34
--- /dev/null
+++ b/activerecord/test/cases/adapters/mysql2/schema_migrations_test.rb
@@ -0,0 +1,39 @@
+require "cases/helper"
+
+module ActiveRecord
+  module ConnectionAdapters
+    class Mysql2Adapter
+      class SchemaMigrationsTest < ActiveRecord::TestCase
+        def test_renaming_index_on_foreign_key
+          connection.add_index "engines", "car_id"
+          connection.add_foreign_key :engines, :cars, name: "fk_engines_cars"
+
+          connection.rename_index("engines", "index_engines_on_car_id", "idx_renamed")
+          assert_equal ["idx_renamed"], connection.indexes("engines").map(&:name)
+        ensure
+          connection.remove_foreign_key :engines, name: "fk_engines_cars"
+        end
+
+        def test_initializes_schema_migrations_for_encoding_utf8mb4
+          smtn = ActiveRecord::Migrator.schema_migrations_table_name
+          connection.drop_table(smtn) if connection.table_exists?(smtn)
+
+          config = connection.instance_variable_get(:@config)
+          original_encoding = config[:encoding]
+
+          config[:encoding] = 'utf8mb4'
+          connection.initialize_schema_migrations_table
+
+          assert connection.column_exists?(smtn, :version, :string, limit: Mysql2Adapter::MAX_INDEX_LENGTH_FOR_UTF8MB4)
+        ensure
+          config[:encoding] = original_encoding
+        end
+
+        private
+        def connection
+          @connection ||= ActiveRecord::Base.connection
+        end
+      end
+    end
+  end
+end