NSJSONSerialization: Implement NSJSONWritingSortedKeys

Tests/base/NSJSONSerialization/sorted.m

@@ -0,0 +1,34 @@
+#import <Foundation/Foundation.h>
+#import "ObjectTesting.h"
+
+void testLexicographicalOrder() {
+  NSArray *objects =
+      [NSArray arrayWithObjects:@"a", @"b", @"c", @"d", @"e", nil];
+  NSArray *keys = [NSArray
+      arrayWithObjects:@"c_ab", @"a_ab", @"d_ab", @"f_cb", @"f_ab", nil];
+  NSDictionary *dict = [NSDictionary dictionaryWithObjects:objects
+                                                   forKeys:keys];
+
+  NSError *error = nil;
+  NSData *actualData =
+      [NSJSONSerialization dataWithJSONObject:dict
+                                      options:NSJSONWritingSortedKeys
+                                        error:&error];
+  PASS_EQUAL(error, nil, "no error occurred during serialisation");
+
+
+  NSString *actual = [[NSString alloc] initWithData:actualData
+                                           encoding:NSUTF8StringEncoding];
+  NSString *expected = @"{\"a_ab\":\"b\",\"c_ab\":\"a\",\"d_ab\":\"c\",\"f_"
+                        "ab\":\"e\",\"f_cb\":\"d\"}";
+  PASS_EQUAL(actual, expected, "JSON is correctly sorted");
+  NSLog(@"%@", actual);
+}
+
+int main(void) {
+  NSAutoreleasePool *arp = [NSAutoreleasePool new];
+
+  testLexicographicalOrder();
+
+  [arp release];
+}