libight.m

@interface GenericTest : NSObject

typedef void(^begin_function)(void);
typedef void(^end_function)(void);

+ (GenericTest *)make_test:NSDictionary;
- (void)begin:begin_function;
- (void)end:end_function;

///

@interface ight : NSObject

+ (void)loop;
+ (void)break_loop;

// FIXME: What is missing is a way to know the progress status
//         Maybe we can add a callback called progress?

///

NSDictionary *settings = @{
    @"nameserver": @"8.8.8.8",
    @"input_filepath": @"/foo/bar",
    @"test_name": @"ooni/dns_injection",
};

GenericTest *test = [GenericTest make_test:settings];

// What I wonder is how much this syntax is surprising (or commonly used!) in ObjeC
[test begin ^{} {
    [test end ^{} {
        [ight break_loop];
    ]
];
[ight loop];