/**
* Tests the build() method when a block is empty.
*
* @covers ::build
* @covers ::buildRegions
* @covers ::buildBlock
*/
public function testBuildEmptyBlock()
{
$account = $this->prophesize(AccountInterface::class);
$block1 = $this->prophesize(BlockPluginInterface::class);
$block1->access($account)->willReturn(TRUE);
// Building a block with empty content.
$block1->build()->willReturn(['#cache' => ['tags' => [0 => 'tag_to_be_merged']]]);
$context_handler = $this->prophesize(ContextHandlerInterface::class);
$uuid_generator = $this->prophesize(UuidInterface::class);
$token = $this->prophesize(Token::class);
$block_manager = $this->prophesize(BlockManager::class);
$condition_manager = $this->prophesize(ConditionManager::class);
$variant_plugin = new PageBlockDisplayVariant([], '', [], $context_handler->reveal(), $account->reveal(), $uuid_generator->reveal(), $token->reveal(), $block_manager->reveal(), $condition_manager->reveal());
// Empty block.
$expected_build = ['#markup' => '', '#cache' => ['tags' => ['block_plugin:block_plugin_id', 'page:page_id', 'tag_to_be_merged'], 'contexts' => [], 'max-age' => -1]];
$build = ['#block_plugin' => $block1->reveal(), '#cache' => ['tags' => ['page:page_id', 'block_plugin:block_plugin_id']]];
$build = $variant_plugin->buildBlock($build);
// Assert that cacheability metadata is merged.
$this->assertSame($expected_build, $build);
}
