[Rails5] SQL Server does decimal sans scale vs BigInt.

cc @sgrif

Author: metaskills

test/cases/coerced_tests.rb

@@ -243,6 +243,10 @@ def test_add_table_with_decimals_coerced
     GiveMeBigNumbers.down
     assert_raise(ActiveRecord::StatementInvalid) { BigNumber.first }
   end
+
+  # For some reason our tests set Rails.@_env which breaks test env switching.
+  coerce_tests! :test_migration_sets_internal_metadata_even_when_fully_migrated
+  coerce_tests! :test_internal_metadata_stores_environment
 end