1 files changed, 37 insertions, 0 deletions
diff --git a/activerecord/test/cases/adapters/mysql2/schema_test.rb b/activerecord/test/cases/adapters/mysql2/schema_test.rb
index 1ebdca661c..17e674e652 100644
--- a/activerecord/test/cases/adapters/mysql2/schema_test.rb
+++ b/activerecord/test/cases/adapters/mysql2/schema_test.rb
@@ -20,6 +20,43 @@ module ActiveRecord
         end
       end
 
+      class MysqlDouble < ActiveRecord::Base
+        self.table_name = "mysql_doubles"
+      end
+
+      def test_float_limits
+        @connection.create_table :mysql_doubles do |t|
+          t.float :float_no_limit
+          t.float :float_short, limit: 5
+          t.float :float_long, limit: 53
+
+          t.float :float_23, limit: 23
+          t.float :float_24, limit: 24
+          t.float :float_25, limit: 25
+        end
+
+        MysqlDouble.reset_column_information
+
+        column_no_limit = MysqlDouble.columns.find { |c| c.name == 'float_no_limit' }
+        column_short = MysqlDouble.columns.find { |c| c.name == 'float_short' }
+        column_long = MysqlDouble.columns.find { |c| c.name == 'float_long' }
+
+        column_23 = MysqlDouble.columns.find { |c| c.name == 'float_23' }
+        column_24 = MysqlDouble.columns.find { |c| c.name == 'float_24' }
+        column_25 = MysqlDouble.columns.find { |c| c.name == 'float_25' }
+
+        # Mysql floats are precision 0..24, Mysql doubles are precision 25..53
+        assert_equal 24, column_no_limit.limit
+        assert_equal 24, column_short.limit
+        assert_equal 53, column_long.limit
+
+        assert_equal 24, column_23.limit
+        assert_equal 24, column_24.limit
+        assert_equal 53, column_25.limit
+      ensure
+        @connection.drop_table "mysql_doubles", if_exists: true
+      end
+
       def test_schema
         assert @omgpost.first
       end