class ConfigStorageTestBase

abstract class ConfigStorageTestBase extends KernelTestBase {
    
    /**
     * @var \Drupal\Core\Config\StorageInterface
     */
    protected $storage;
    
    /**
     * @var \Drupal\Core\Config\StorageInterface
     */
    protected $invalidStorage;
    
    /**
     * Tests storage CRUD operations.
     *
     * @todo Coverage: Trigger PDOExceptions / Database exceptions.
     */
    public function testCRUD() {
        $name = 'config_test.storage';
        // Checking whether a non-existing name exists returns FALSE.
        $this->assertFalse($this->storage
            ->exists($name));
        // Reading a non-existing name returns FALSE.
        $data = $this->storage
            ->read($name);
        $this->assertFalse($data);
        // Writing data returns TRUE and the data has been written.
        $data = [
            'foo' => 'bar',
        ];
        $result = $this->storage
            ->write($name, $data);
        $this->assertTrue($result);
        $raw_data = $this->read($name);
        $this->assertSame($data, $raw_data);
        // Checking whether an existing name exists returns TRUE.
        $this->assertTrue($this->storage
            ->exists($name));
        // Writing the identical data again still returns TRUE.
        $result = $this->storage
            ->write($name, $data);
        $this->assertTrue($result);
        // Listing all names returns all.
        $names = $this->storage
            ->listAll();
        $this->assertContains('system.performance', $names);
        $this->assertContains($name, $names);
        // Listing all names with prefix returns names with that prefix only.
        $names = $this->storage
            ->listAll('config_test.');
        $this->assertNotContains('system.performance', $names);
        $this->assertContains($name, $names);
        // Rename the configuration storage object.
        $new_name = 'config_test.storage_rename';
        $this->storage
            ->rename($name, $new_name);
        $raw_data = $this->read($new_name);
        $this->assertSame($data, $raw_data);
        // Rename it back so further tests work.
        $this->storage
            ->rename($new_name, $name);
        // Deleting an existing name returns TRUE.
        $result = $this->storage
            ->delete($name);
        $this->assertTrue($result);
        // Deleting a non-existing name returns FALSE.
        $result = $this->storage
            ->delete($name);
        $this->assertFalse($result);
        // Deleting all names with prefix deletes the appropriate data and returns
        // TRUE.
        $files = [
            'config_test.test.biff',
            'config_test.test.bang',
            'config_test.test.pow',
        ];
        foreach ($files as $name) {
            $this->storage
                ->write($name, $data);
        }
        // Test that deleting a prefix that returns no configuration returns FALSE
        // because nothing is deleted.
        $this->assertFalse($this->storage
            ->deleteAll('some_thing_that_cannot_exist'));
        $result = $this->storage
            ->deleteAll('config_test.');
        $names = $this->storage
            ->listAll('config_test.');
        $this->assertTrue($result);
        $this->assertSame([], $names);
        // Test renaming an object that does not exist returns FALSE.
        $this->assertFalse($this->storage
            ->rename('config_test.storage_does_not_exist', 'config_test.storage_does_not_exist_rename'));
        // Test renaming to an object that already returns FALSE.
        $data = [
            'foo' => 'bar',
        ];
        $this->assertTrue($this->storage
            ->write($name, $data));
        $this->assertFalse($this->storage
            ->rename('config_test.storage_does_not_exist', $name));
    }
    
    /**
     * Tests an invalid storage.
     */
    public function testInvalidStorage() {
        $name = 'config_test.storage';
        // Write something to the valid storage to prove that the storages do not
        // pollute one another.
        $data = [
            'foo' => 'bar',
        ];
        $result = $this->storage
            ->write($name, $data);
        $this->assertTrue($result);
        $raw_data = $this->read($name);
        $this->assertSame($data, $raw_data);
        // Reading from a non-existing storage bin returns FALSE.
        $result = $this->invalidStorage
            ->read($name);
        $this->assertFalse($result);
        // Deleting from a non-existing storage bin throws an exception.
        try {
            $this->invalidStorage
                ->delete($name);
            $this->fail('Exception not thrown upon deleting from a non-existing storage bin.');
        } catch (\Exception $e) {
            // An exception occurred as expected; just continue.
        }
        // Listing on a non-existing storage bin returns an empty array.
        $result = $this->invalidStorage
            ->listAll();
        $this->assertSame([], $result);
        // Getting all collections on a non-existing storage bin return an empty
        // array.
        $this->assertSame([], $this->invalidStorage
            ->getAllCollectionNames());
        // Writing to a non-existing storage bin creates the bin.
        $this->invalidStorage
            ->write($name, [
            'foo' => 'bar',
        ]);
        $result = $this->invalidStorage
            ->read($name);
        $this->assertSame([
            'foo' => 'bar',
        ], $result);
    }
    
    /**
     * Tests storage writing and reading data preserving data type.
     */
    public function testDataTypes() {
        $name = 'config_test.types';
        $data = [
            'array' => [],
            'boolean' => TRUE,
            'exp' => 1.2E+34,
            'float' => 3.14159,
            'hex' => 0xc,
            'int' => 99,
            'octal' => 0775,
            'string' => 'string',
            'string_int' => '1',
        ];
        $result = $this->storage
            ->write($name, $data);
        $this->assertTrue($result);
        $read_data = $this->storage
            ->read($name);
        $this->assertSame($data, $read_data);
    }
    
    /**
     * Tests that the storage supports collections.
     */
    public function testCollection() {
        $name = 'config_test.storage';
        $data = [
            'foo' => 'bar',
        ];
        $result = $this->storage
            ->write($name, $data);
        $this->assertTrue($result);
        $this->assertSame($data, $this->storage
            ->read($name));
        // Create configuration in a new collection.
        $new_storage = $this->storage
            ->createCollection('collection.sub.new');
        $this->assertFalse($new_storage->exists($name));
        $this->assertEquals([], $new_storage->listAll());
        $this->assertFalse($new_storage->delete($name));
        $this->assertFalse($new_storage->deleteAll('config_test.'));
        $this->assertFalse($new_storage->deleteAll());
        $this->assertFalse($new_storage->rename($name, 'config_test.another_name'));
        $new_storage->write($name, $data);
        $this->assertTrue($result);
        $this->assertSame($data, $new_storage->read($name));
        $this->assertEquals([
            $name,
        ], $new_storage->listAll());
        $this->assertTrue($new_storage->exists($name));
        $new_data = [
            'foo' => 'baz',
        ];
        $new_storage->write($name, $new_data);
        $this->assertTrue($result);
        $this->assertSame($new_data, $new_storage->read($name));
        // Create configuration in another collection.
        $another_storage = $this->storage
            ->createCollection('collection.sub.another');
        $this->assertFalse($another_storage->exists($name));
        $this->assertEquals([], $another_storage->listAll());
        $another_storage->write($name, $new_data);
        $this->assertTrue($result);
        $this->assertSame($new_data, $another_storage->read($name));
        $this->assertEquals([
            $name,
        ], $another_storage->listAll());
        $this->assertTrue($another_storage->exists($name));
        // Create configuration in yet another collection.
        $alt_storage = $this->storage
            ->createCollection('alternate');
        $alt_storage->write($name, $new_data);
        $this->assertTrue($result);
        $this->assertSame($new_data, $alt_storage->read($name));
        // Switch back to the collection-less mode and check the data still exists
        // add has not been touched.
        $this->assertSame($data, $this->storage
            ->read($name));
        // Check that the getAllCollectionNames() method works.
        $this->assertSame([
            'alternate',
            'collection.sub.another',
            'collection.sub.new',
        ], $this->storage
            ->getAllCollectionNames());
        // Check that the collections are removed when they are empty.
        $alt_storage->delete($name);
        $this->assertSame([
            'collection.sub.another',
            'collection.sub.new',
        ], $this->storage
            ->getAllCollectionNames());
        // Create configuration in collection called 'collection'. This ensures that
        // FileStorage's collection storage works regardless of its use of
        // subdirectories.
        $parent_storage = $this->storage
            ->createCollection('collection');
        $this->assertFalse($parent_storage->exists($name));
        $this->assertEquals([], $parent_storage->listAll());
        $parent_storage->write($name, $new_data);
        $this->assertTrue($result);
        $this->assertSame($new_data, $parent_storage->read($name));
        $this->assertEquals([
            $name,
        ], $parent_storage->listAll());
        $this->assertTrue($parent_storage->exists($name));
        $this->assertSame([
            'collection',
            'collection.sub.another',
            'collection.sub.new',
        ], $this->storage
            ->getAllCollectionNames());
        $parent_storage->deleteAll();
        $this->assertSame([
            'collection.sub.another',
            'collection.sub.new',
        ], $this->storage
            ->getAllCollectionNames());
        // Test operations on a collection emptied through deletion.
        $this->assertFalse($parent_storage->exists($name));
        $this->assertEquals([], $parent_storage->listAll());
        $this->assertFalse($parent_storage->delete($name));
        $this->assertFalse($parent_storage->deleteAll('config_test.'));
        $this->assertFalse($parent_storage->deleteAll());
        $this->assertFalse($parent_storage->rename($name, 'config_test.another_name'));
        // Check that the having an empty collection-less storage does not break
        // anything. Before deleting check that the previous delete did not affect
        // data in another collection.
        $this->assertSame($data, $this->storage
            ->read($name));
        $this->storage
            ->delete($name);
        $this->assertSame([
            'collection.sub.another',
            'collection.sub.new',
        ], $this->storage
            ->getAllCollectionNames());
    }
    protected abstract function read($name);
    protected abstract function insert($name, $data);
    protected abstract function update($name, $data);
    protected abstract function delete($name);

}