Fix the test by looking until we've marked as seen all the indexes we're supposed to see, not until we see one that isn't supposed to be seen (because it may arrive out of order vs others we want to mark as seen.)

Author: millenomi

TestFoundation/TestNSArray.swift

@@ -218,14 +218,26 @@ class TestNSArray : XCTestCase {
             var indexesForStaggeredEnumeration = indexesForHalfEnumeration
             indexesForStaggeredEnumeration.formIntersection(evenIndexes)
 
+            let finalCount = indexesForStaggeredEnumeration.count
+            
+            let lockForSeenCount = NSLock()
+            var seenCount = 0
+            
             testExpectingToSee(indexesForStaggeredEnumeration) { (indexesSeen) in
                 array.enumerateObjects(at: evenIndexes, options: options, using: { (value, index, stop) in
                     XCTAssertEqual(value as! NSNumber, array[index] as! NSNumber)
 
                     if (indexesForStaggeredEnumeration.contains(index)) {
                         indexesSeen[index] = true
-                    } else {
-                        stop.pointee = true
+                        
+                        lockForSeenCount.lock()
+                        seenCount += 1
+                        let currentCount = seenCount
+                        lockForSeenCount.unlock()
+                        
+                        if currentCount == finalCount {
+                            stop.pointee = true
+                        }
                     }
                 })
             }