Great bug. I think?

test.m

#import <XCTest/XCTest.h>

@interface RadarReport_Tests : XCTestCase
@property (strong) NSMapTable *mt;
@end

@implementation RadarReport_Tests

- (void)setUp
{
    self.mt = [[NSMapTable alloc] init];
    [self.mt setObject:@"hello" forKey:@20];
    [self.mt setObject:@"world" forKey:@"twenty"];
    [self.mt setObject:@20 forKey:self.mt];
}

- (void)testWorkingCondition
{
    
    [self.mt setObject:[NSData dataWithBytes:"one" length:3] forKey:[NSValue valueWithPoint:NSMakePoint(10, 20)]];
    
    NSNumber *n = [self.mt objectForKey:self.mt];
    XCTAssertNotNil(n, @"This should not be nil");
}

- (void) testBadCondition
{
    NSNumber *n = [self.mt objectForKey:self.mt];
    XCTAssertNil(n, @"But this IS nil");
}

@end