DatabaseSelectTestCase::testIsNotNullCondition in core/modules/simpletest/tests/database_test.test

Test that we can find a record without a NULL value.

DatabaseSelectTestCase::testIsNullCondition in core/modules/simpletest/tests/database_test.test

Test that we can find a record with a NULL value.

DatabaseSelectTestCase::testNullCondition in core/modules/simpletest/tests/database_test.test

Test that a comparison with NULL is always FALSE.

DatabaseUpdateTestCase::testSimpleNullUpdate in core/modules/simpletest/tests/database_test.test

Confirm updating to NULL.