7.x common.test | DrupalJSONTest::testJSON() |
Tests converting PHP variables to JSON strings and back.
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, t('A string with the full ASCII table has the correct length.'));
foreach ($html_unsafe as $char) {
$this->assertTrue(strpos($str, $char) > 0, t('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), t('A JSON encoded string is larger than the source string.'));
// The first and last characters should be ", and no others.
$this->assertTrue($json[0] == '"', t('A JSON encoded string begins with ".'));
$this->assertTrue($json[strlen($json) - 1] == '"', t('A JSON encoded string ends with ".'));
$this->assertTrue(substr_count($json, '"') == 2, t('A JSON encoded string contains exactly two ".'));
// Verify that encoding/decoding is reversible.
$json_decoded = drupal_json_decode($json);
$this->assertIdentical($str, $json_decoded, t('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, t('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, t('A JSON encoded string contains @s.', array('@s' => $char)));
}
$json_decoded = drupal_json_decode($json);
$this->assertNotIdentical($source, $json, t('An array encoded in JSON is not identical to the source.'));
$this->assertIdentical($source, $json_decoded, t('Encoding structured data to JSON and decoding back results in the original data.'));
}