53 lines
1.9 KiB
Objective-C
53 lines
1.9 KiB
Objective-C
#import <XCTest/XCTest.h>
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#import "SequenceCounter.h"
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#import "TestUtil.h"
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@interface SequenceCounterTest : XCTestCase
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@end
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@implementation SequenceCounterTest
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-(void)testCountingForwards {
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SequenceCounter* s = [SequenceCounter sequenceCounter];
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test([s convertNext:1] == (int64_t)1);
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test([s convertNext:2] == (int64_t)2);
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test([s convertNext:6] == (int64_t)6);
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}
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-(void)testCountingBackwards {
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SequenceCounter* s = [SequenceCounter sequenceCounter];
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test([s convertNext:UINT16_MAX] == (int64_t)-1);
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test([s convertNext:UINT16_MAX-1] == (int64_t)-2);
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test([s convertNext:UINT16_MAX-5] == (int64_t)-6);
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}
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-(void)testCountingLimits {
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SequenceCounter* s = [SequenceCounter sequenceCounter];
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uint16_t signedMin = (uint16_t)((int32_t)INT16_MIN + (1 << 16));
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test([s convertNext:INT16_MAX] == (int64_t)INT16_MAX);
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test([s convertNext:INT16_MAX] == (int64_t)INT16_MAX);
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test([s convertNext:signedMin] == (int64_t)(INT16_MAX + 1));
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test([s convertNext:signedMin] == (int64_t)(INT16_MAX + 1));
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}
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-(void)testCountingRandomizedDelta {
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SequenceCounter* s = [SequenceCounter sequenceCounter];
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int64_t prevLongId = 0;
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uint16_t prevShortId = 0;
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for (long i = 0; i < 1000; i++) {
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int32_t delta = (int32_t)arc4random_uniform(1 << 16);
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if (delta > INT16_MAX) delta -= 1 << 16;
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int64_t nextLongId = prevLongId + delta;
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uint16_t nextShortId = (uint16_t)(nextLongId & 0xFFFF);
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int64_t actualNextLongId = [s convertNext:nextShortId];
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if (nextLongId != actualNextLongId) {
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XCTFail(@"Bad transition: %lld, %lld + %lld -> %lld, %lld != %lld", (long long)prevShortId, (long long)prevLongId, (long long)delta, (long long)nextShortId, (long long)actualNextLongId, (long long)nextLongId);
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return;
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}
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prevLongId = nextLongId;
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prevShortId = nextShortId;
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}
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}
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@end
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