public function StreamWrapperTest::testReadWrite in Examples for Developers 8

Same name and namespace in other branches

1. 3.x modules/stream_wrapper_example/tests/src/Kernel/StreamWrapperTest.php \Drupal\Tests\stream_wrapper_example\Kernel\StreamWrapperTest::testReadWrite()

Test functions on a URI.

File

stream_wrapper_example/tests/src/Kernel/StreamWrapperTest.php, line 58

Class

StreamWrapperTest

Test of the Session Stream Wrapper Class.

Namespace

Drupal\Tests\stream_wrapper_example\Kernel

Code

public function testReadWrite() {
  $this
    ->resetStore();
  $uri = 'session://drupal.txt';
  $this
    ->assertFileNotExists($uri, "File {$uri} should not exist yet.");
  $handle = fopen($uri, 'wb');
  $this
    ->assertNotEmpty($handle, "Handle for {$uri} should be non-empty.");
  $buffer = "Ain't seen nothin' yet!\n";

  // Original session class gets an error here,
  // "...stream_write wrote 10 bytes more data than requested".
  // Does not matter for our demo, so repress error reporting here.".
  $old = error_reporting(E_ERROR);
  $bytes_written = @fwrite($handle, $buffer);
  error_reporting($old);
  $this
    ->assertNotFalse($bytes_written, "Write to {$uri} succeeded.");
  $result = fclose($handle);
  $this
    ->assertNotFalse($result, "Closed {$uri}.");
  $this
    ->assertFileExists($uri, "File {$uri} should now exist.");
  $this
    ->assertDirectoryNotExists($uri, "{$uri} is not a directory.");
  $this
    ->assertTrue(is_file($uri), "{$uri} is a file.");
  $contents = file_get_contents($uri);

  // The example implementation calls HTML::escape() on output. We reverse it
  // well enough for our sample data (this code is not I18n safe).
  $contents = Html::decodeEntities($contents);
  $this
    ->assertEquals($buffer, $contents, "Data for {$uri} should make the round trip.");
}