Message to super

Test.m

#import <objc/runtime.h>

#import <Foundation/Foundation.h>

@interface Superclass1 : NSObject
- (void)testMethod;
@end

@interface Superclass2 : NSObject
- (void)testMethod;
@end

@interface Subclass : Superclass1

@end

int main(int argc, const char * argv[])
{
    @autoreleasepool
    {
        Subclass *obj = [[Subclass alloc] init];

        [obj testMethod];

        class_setSuperclass([Subclass class], [Superclass2 class]);
        [obj testMethod];
    }
    return 0;
}

@implementation Superclass1

- (void)testMethod;
{
    NSLog(@"Superclass1");
}

@end

@implementation Superclass2

- (void)testMethod;
{
    NSLog(@"Superclass2");
}

@end

@implementation Subclass

- (void)testMethod;
{
    [super testMethod];
}
@end