function BlockViewBuilderTest::testBlockViewBuilderViewAlter

Tests block view altering.

See also

hook_block_view_alter()

hook_block_view_BASE_BLOCK_ID_alter()

File

core/modules/block/tests/src/Kernel/BlockViewBuilderTest.php, line 187

Class

BlockViewBuilderTest

Tests the block view builder.

Namespace

Code

public function testBlockViewBuilderViewAlter() {
    // Establish baseline.
    $build = $this->getBlockRenderArray();
    $this->setRawContent((string) $this->renderer
        ->renderRoot($build));
    $this->assertIdentical(trim((string) $this->cssSelect('div')[0]), 'Llamas > unicorns!');
    // Enable the block view alter hook that adds a foo=bar attribute.
    \Drupal::state()->set('block_test_view_alter_suffix', TRUE);
    Cache::invalidateTags($this->block
        ->getCacheTagsToInvalidate());
    $build = $this->getBlockRenderArray();
    $this->setRawContent((string) $this->renderer
        ->renderRoot($build));
    $this->assertIdentical(trim((string) $this->cssSelect('[foo=bar]')[0]), 'Llamas > unicorns!');
    \Drupal::state()->set('block_test_view_alter_suffix', FALSE);
    \Drupal::state()->set('block_test.content', NULL);
    Cache::invalidateTags($this->block
        ->getCacheTagsToInvalidate());
    // Advanced: cached block, but an alter hook adds a #pre_render callback to
    // alter the eventual content.
    \Drupal::state()->set('block_test_view_alter_append_pre_render_prefix', TRUE);
    $build = $this->getBlockRenderArray();
    $this->assertFalse(isset($build['#prefix']), 'The appended #pre_render callback has not yet run before rendering.');
    $this->assertIdentical((string) $this->renderer
        ->renderRoot($build), 'Hiya!<br>');
    $this->assertTrue(isset($build['#prefix']) && $build['#prefix'] === 'Hiya!<br>', 'A cached block without content is altered.');
}