1 files changed, 52 insertions, 0 deletions
diff --git a/modules/simpletest/tests/common.test b/modules/simpletest/tests/common.test
index e74b053d1..aa43a62eb 100644
--- a/modules/simpletest/tests/common.test
+++ b/modules/simpletest/tests/common.test
@@ -1723,3 +1723,55 @@ class DrupalAttributesUnitTest extends DrupalUnitTestCase {
     $this->assertIdentical(drupal_attributes(array()), '', t('Empty attributes array.'));
   }
 }
+
+/**
+ * Tests converting PHP variables to JSON strings and back.
+ */
+class DrupalJSONTest extends DrupalUnitTestCase {
+  public static function getInfo() {
+    return array(
+      'name' => 'JSON',
+      'description' => 'Perform unit tests on the drupal_json_encode() and drupal_json_decode() functions.',
+      'group' => 'System',
+    );
+  }
+
+  /**
+   * 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.
+    $html_unsafe = array('<', '>', '&');
+
+    // 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.'));
+
+    // 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)));
+    }
+    $json_decoded = drupal_json_decode($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.'));
+  }
+}