UserNameConstraint example

$this->assertSame('1: [entity_test: 1]: name.0.value=<em class="placeholder">Name</em>: may not be longer than 64 characters.||user_id.0.target_id=The referenced entity (<em class="placeholder">user</em>: <em class="placeholder">1</em>) does not exist.', $this->messages[0], 'First message should have 2 validation errors.');
    $this->assertSame('2: [entity_test: 2]: user_id.0.target_id=The referenced entity (<em class="placeholder">user</em>: <em class="placeholder">1</em>) does not exist.', $this->messages[1], 'Second message should have 1 validation error.');
    $this->assertArrayNotHasKey(2, $this->messages, 'Third message should not exist.');
  }

  /** * Tests an import with invalid data and checks error messages. */
  public function test2() {
    $long_username = $this->randomString(61);
    $username_constraint = new UserNameConstraint();

    $this->runImport([
      'source' => [
        'plugin' => 'embedded_data',
        'data_rows' => [
          [
            'id' => 1,
            'name' => $long_username,
          ],
          [
            'id' => 2,