DateFieldTestCase::testField in core/modules/date/tests/date_field.test

@todo.

DateTimezoneTestCase::testMultiUserTimezone in core/modules/date/tests/date_timezone.test

Validates timezone handling with a multi-value date field.

DateTimezoneTestCase::testTimezone in core/modules/date/tests/date_timezone.test

Creates one of each type of date field and check timezone handling in each.

DateUITestCase::testFieldUI in core/modules/date/tests/date.test

DateValidationTestCase::testValidation in core/modules/date/tests/date_validation.test

Test validation on each type of date widget.

DateViewsTestCase::testDateViewsFields in core/modules/date/tests/date_views.test