class TaxonomyTermReferenceFieldTest

class TaxonomyTermReferenceFieldTest extends UnitTestCase {
    
    /**
     * @var \Drupal\migrate_drupal\Plugin\MigrateFieldInterface
     */
    protected $plugin;
    
    /**
     * @var \Drupal\migrate\Plugin\MigrationInterface
     */
    protected $migration;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        $this->plugin = new TaxonomyTermReference([], 'taxonomy', []);
        $migration = $this->prophesize(MigrationInterface::class);
        // The plugin's defineValueProcessPipeline() method will call
        // setProcessOfProperty() and return nothing. So, in order to examine the
        // process pipeline created by the plugin, we need to ensure that
        // getProcess() always returns the last input to setProcessOfProperty().
        $migration->setProcessOfProperty(Argument::type('string'), Argument::type('array'))
            ->will(function ($arguments) use ($migration) {
            $migration->getProcess()
                ->willReturn($arguments[1]);
        });
        $this->migration = $migration->reveal();
    }
    
    /**
     * @covers ::defineValueProcessPipeline
     */
    public function testDefineValueProcessPipeline($method = 'defineValueProcessPipeline') {
        $this->plugin
            ->{$method}($this->migration, 'field_name', []);
        $expected = [
            'plugin' => 'sub_process',
            'source' => 'field_name',
            'process' => [
                'target_id' => 'tid',
            ],
        ];
        $this->assertSame($expected, $this->migration
            ->getProcess());
    }

}