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Diffstat (limited to 'lib/Hashing.Portable/tests')
| -rw-r--r-- | lib/Hashing.Portable/tests/Fnv1aTests.cs | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/Hashing.Portable/tests/Fnv1aTests.cs b/lib/Hashing.Portable/tests/Fnv1aTests.cs new file mode 100644 index 0000000..2c6431f --- /dev/null +++ b/lib/Hashing.Portable/tests/Fnv1aTests.cs @@ -0,0 +1,47 @@ +using Microsoft.VisualStudio.TestTools.UnitTesting; + +using System.Text; + +using VNLib.Hashing.Checksums; + +namespace VNLib.Hashing.Tests +{ + [TestClass()] + public class Fnv1aTests + { + const string KnownDataInputUtf81 = "Hello world, this is a test of the FNV1a algorithm"; + const string KnownData64ChecksumHex1 = "033b9d1635f1c2ad"; + + const string KnownDataInputUtf82 = "Hello world, this is another, slightly different test of the FNV1a algorithm!"; + const string KnownData64ChecksumHex2 = "a802c807e941c5d3"; + + [TestMethod()] + public void Fnv1a64Known1() + { + TestKnownData(KnownDataInputUtf81, KnownData64ChecksumHex1); + TestKnownData(KnownDataInputUtf82, KnownData64ChecksumHex2); + } + + static void TestKnownData(string input, string knownChecksumHex) + { + byte[] knownInput = Encoding.UTF8.GetBytes(input); + ulong knownChecksum = Convert.ToUInt64(knownChecksumHex, 16); + + ulong checksum = FNV1a.Compute64(knownInput); + + Assert.AreEqual(knownChecksum, checksum); + + //Split input into 2 parts + byte[] part1 = knownInput[..(knownInput.Length / 2)]; + byte[] part2 = knownInput[(knownInput.Length / 2)..]; + + //Compute checksum of part1 + ulong checksum1 = FNV1a.Compute64(part1); + ulong outputChecksum = FNV1a.Update64(checksum1, part2); + + Assert.AreNotEqual(checksum1, outputChecksum); + Assert.AreEqual(knownChecksum, outputChecksum); + } + + } +}
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