#import <Foundation/Foundation.h>

@interface TestCls: NSObject

@property(nonatomic, copy) NSString *name;

@end

@implementation TestCls

- (instancetype)init {
	if (self = [super init]) {
		[self testFunction];
	}
	return self;
}

- (void)testFunction {
	NSLog(@"testFunction %@", self.name);
}

@end

@interface TestCls (TestCategory)

- (void)testFunction;

@end

@implementation TestCls (TestCategory)

- (void)testFunction {
	NSLog(@"another testFunction");
}

- (Class)class {
	return [NSString class];
}

@end

int main() {
	TestCls *testCls = [[TestCls alloc] init];
	[testCls testFunction];
	NSLog(@"which class is testCls %@", [testCls class]);
	NSString *testStr = @"testStr";
	NSLog(@"which class is testStr %@", [testStr class]);
}

@implementation NSString (Test_Category)

- (Class)class {
	return [NSNumber class];
}

@end