Prefer...

```
@interface JUnitReporter ()

@property (nonatomic, retain) NSMutableArray *testResults;
@property (nonatomic, retain) NSDateFormatter *formatter;
@property (nonatomic, retain) NSRegularExpression *regex;

- (void)writeTestSuite:(NSDictionary *)event;
- (void)write:(NSString *)string;
- (NSString *)xmlEscape:(NSString *)string;

@end
```