38 lines
1.7 KiB
Mathematica
38 lines
1.7 KiB
Mathematica
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#import <XCTest/XCTest.h>
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@import WMF;
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@interface CircularBitwiseRotationTests : XCTestCase
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@end
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@implementation CircularBitwiseRotationTests
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- (void)testMatchesCorrespondingPowerOfTwo {
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for (NSUInteger rotation; rotation < NSUINT_BIT; rotation++) {
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NSUInteger actualResult = flipBitsWithAdditionalRotation(1, rotation);
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// add by NSUINT_BIT_2 to model the "flipping," then modulo for rotation
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NSUInteger exponent = (rotation + NSUINT_BIT_2) % NSUINT_BIT;
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NSUInteger expectedResult = powl(2, exponent);
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XCTAssertEqual(actualResult, expectedResult,
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@"Rotating 1 by %lu should be equal to 2^%lu (%lu). Got %lu instead",
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(unsigned long)rotation, (unsigned long)exponent, (unsigned long)expectedResult, (unsigned long)actualResult);
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}
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}
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- (void)testSymmetrical {
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for (NSUInteger i; i < 50; i++) {
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NSUInteger testValue = arc4random();
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for (NSUInteger rotation; rotation < NSUINT_BIT; rotation++) {
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NSUInteger symmetricalRotation = rotation + NSUINT_BIT;
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NSUInteger original = flipBitsWithAdditionalRotation(testValue, rotation);
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NSUInteger symmetrical = flipBitsWithAdditionalRotation(testValue, symmetricalRotation);
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XCTAssertEqual(original, symmetrical,
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@"Rotating %lu by %lu should be the same as rotating by %lu + NSUINT_BIT (%lu)."
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"Got %lu expected %lu",
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(unsigned long)testValue, (unsigned long)rotation, (unsigned long)rotation, (unsigned long)symmetricalRotation, (unsigned long)symmetrical, (unsigned long)original);
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}
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}
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}
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@end
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