Tests expected behavior of setUp().
function testSetUp() {
$module = 'entity_test';
$table = 'entity_test';
// Verify that specified $modules have been loaded.
$this
->assertTrue(function_exists('entity_test_permission'), "{$module}.module was loaded.");
// Verify that there is a fixed module list.
$this
->assertIdentical(module_list(), array(
$module => $module,
));
$this
->assertIdentical(module_implements('permission'), array(
$module,
));
// Verify that no modules have been installed.
$this
->assertFalse(db_table_exists($table), "'{$table}' database table not found.");
}