function DrupalJSONTest::testJSON

Tests converting PHP variables to JSON strings and back.

File

modules/simpletest/tests/common.test, line 3101

Class

DrupalJSONTest

Tests converting PHP variables to JSON strings and back.

Code

function testJSON() {
    // Setup a string with the full ASCII table.
    // @todo: Add tests for non-ASCII characters and Unicode.
    $str = '';
    for ($i = 0; $i < 128; $i++) {
        $str .= chr($i);
    }
    // Characters that must be escaped.
    // We check for unescaped " separately.
    $html_unsafe = array(
        '<',
        '>',
        '\'',
        '&',
    );
    // The following are the encoded forms of: < > ' & "
    $html_unsafe_escaped = array(
        '\\u003C',
        '\\u003E',
        '\\u0027',
        '\\u0026',
        '\\u0022',
    );
    // Verify there aren't character encoding problems with the source string.
    $this->assertIdentical(strlen($str), 128, 'A string with the full ASCII table has the correct length.');
    foreach ($html_unsafe as $char) {
        $this->assertTrue(strpos($str, $char) > 0, format_string('A string with the full ASCII table includes @s.', array(
            '@s' => $char,
        )));
    }
    // Verify that JSON encoding produces a string with all of the characters.
    $json = drupal_json_encode($str);
    $this->assertTrue(strlen($json) > strlen($str), 'A JSON encoded string is larger than the source string.');
    // The first and last characters should be ", and no others.
    $this->assertTrue($json[0] == '"', 'A JSON encoded string begins with ".');
    $this->assertTrue($json[strlen($json) - 1] == '"', 'A JSON encoded string ends with ".');
    $this->assertTrue(substr_count($json, '"') == 2, 'A JSON encoded string contains exactly two ".');
    // Verify that encoding/decoding is reversible.
    $json_decoded = drupal_json_decode($json);
    $this->assertIdentical($str, $json_decoded, 'Encoding a string to JSON and decoding back results in the original string.');
    // Verify reversibility for structured data. Also verify that necessary
    // characters are escaped.
    $source = array(
        TRUE,
        FALSE,
        0,
        1,
        '0',
        '1',
        $str,
        array(
            'key1' => $str,
            'key2' => array(
                'nested' => TRUE,
            ),
        ),
    );
    $json = drupal_json_encode($source);
    foreach ($html_unsafe as $char) {
        $this->assertTrue(strpos($json, $char) === FALSE, format_string('A JSON encoded string does not contain @s.', array(
            '@s' => $char,
        )));
    }
    // Verify that JSON encoding escapes the HTML unsafe characters
    foreach ($html_unsafe_escaped as $char) {
        $this->assertTrue(strpos($json, $char) > 0, format_string('A JSON encoded string contains @s.', array(
            '@s' => $char,
        )));
    }
    $json_decoded = drupal_json_decode($json);
    $this->assertNotIdentical($source, $json, 'An array encoded in JSON is not identical to the source.');
    $this->assertIdentical($source, $json_decoded, 'Encoding structured data to JSON and decoding back results in the original data.');
}