trait DevelDumperTestTrait

trait DevelDumperTestTrait {
    
    /**
     * Assertion for ensure dump content.
     *
     * Asserts that the string passed in input is equals to the string
     * representation of a variable obtained exporting the data.
     *
     * Use \Drupal\devel\DevelDumperManager::export().
     *
     * @param string $dump
     *   The string that contains the dump output to test.
     * @param mixed $data
     *   The variable to dump.
     * @param string $name
     *   (optional) The label to output before variable, defaults to NULL.
     * @param string $message
     *   (optional) A message to display with the assertion.
     */
    public function assertDumpExportEquals($dump, mixed $data, $name = NULL, $message = '') : void {
        $output = $this->getDumperExportDump($data, $name);
        $this->assertEquals(rtrim($dump), $output, $message);
    }
    
    /**
     * Asserts that a haystack contains the dump export output.
     *
     * Use \Drupal\devel\DevelDumperManager::export().
     *
     * @param string $haystack
     *   The string that contains the dump output to test.
     * @param mixed $data
     *   The variable to dump.
     * @param string $name
     *   (optional) The label to output before variable, defaults to NULL.
     * @param string $message
     *   (optional) A message to display with the assertion.
     */
    public function assertContainsDumpExport($haystack, mixed $data, $name = NULL, $message = '') : void {
        // As at 18.04.2020 assertContainsDumpExport() is not actually used in any
        // devel tests in any current code branch.
        $output = $this->getDumperExportDump($data, $name);
        $this->assertStringContainsString($output, (string) $haystack, $message);
    }
    
    /**
     * Assertion for ensure dump content.
     *
     * Asserts that the string passed in input is equals to the string
     * representation of a variable obtained dumping the data.
     *
     * Use \Drupal\devel\DevelDumperManager::dump().
     *
     * @param string $dump
     *   The string that contains the dump output to test.
     * @param mixed $data
     *   The variable to dump.
     * @param string $name
     *   (optional) The label to output before variable, defaults to NULL.
     * @param string $message
     *   (optional) A message to display with the assertion.
     */
    public function assertDumpEquals($dump, mixed $data, $name = NULL, $message = '') : void {
        $output = $this->getDumperDump($data, $name);
        $this->assertEquals(rtrim($dump), $output, $message);
    }
    
    /**
     * Asserts that a haystack contains the dump output.
     *
     * Use \Drupal\devel\DevelDumperManager::dump().
     *
     * @param string $haystack
     *   The string that contains the dump output to test.
     * @param mixed $data
     *   The variable to dump.
     * @param string $name
     *   (optional) The label to output before variable, defaults to NULL.
     * @param string $message
     *   (optional) A message to display with the assertion.
     */
    public function assertContainsDump($haystack, mixed $data, $name = NULL, $message = '') : void {
        $output = $this->getDumperDump($data, $name);
        $this->assertStringContainsString($output, (string) $haystack, $message);
    }
    
    /**
     * Returns a string representation of a variable.
     *
     * @param mixed $input
     *   The variable to dump.
     * @param string $name
     *   (optional) The label to output before variable, defaults to NULL.
     *
     * @return string
     *   String representation of a variable.
     *
     * @see \Drupal\devel\DevelDumperManager::export()
     */
    private function getDumperExportDump(mixed $input, $name = NULL) : string {
        $output = \Drupal::service('devel.dumper')->export($input, $name);
        return rtrim($output);
    }
    
    /**
     * Returns a string representation of a variable.
     *
     * @param mixed $input
     *   The variable to dump.
     * @param string $name
     *   (optional) The label to output before variable, defaults to NULL.
     *
     * @return string
     *   String representation of a variable.
     *
     * @see \Drupal\devel\DevelDumperManager::dump()
     */
    private function getDumperDump(mixed $input, $name = NULL) : string {
        ob_start();
        \Drupal::service('devel.dumper')->dump($input, $name);
        $output = ob_get_contents();
        ob_end_clean();
        return rtrim($output);
    }

}