129 lines
2.3 KiB
Nim
129 lines
2.3 KiB
Nim
{.used.}
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import
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unittest2,
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strformat,
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../beacon_chain/ssz/bitseqs,
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./testutil
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suite "Bit fields":
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test "roundtrips BitArray":
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var
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a = BitArray[100]()
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b = BitArray[100]()
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check:
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not a[0]
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a.setBit 1
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check:
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not a[0]
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a[1]
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a + b == a
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a - b == a
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b + a == a
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b - a == b # b is empty
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b.setBit 2
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check:
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(a + b)[2]
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(b - a)[2]
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not (b - a)[1]
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a.incl(b)
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check:
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not a[0]
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a[1]
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a[2]
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a.clear()
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check:
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not a[1]
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test "roundtrips BitSeq":
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var
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a = BitSeq.init(100)
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b = BitSeq.init(100)
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check:
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not a[0]
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a.isZeros()
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a.setBit 1
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check:
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not a[0]
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a[1]
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a.countOnes() == 1
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a.countZeros() == 99
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not a.isZeros()
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a.countOverlap(a) == 1
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b.setBit 2
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a.incl(b)
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check:
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not a[0]
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a[1]
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a[2]
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a.countOverlap(a) == 2
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a.countOverlap(b) == 1
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b.countOverlap(a) == 1
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b.countOverlap(b) == 1
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a.clear()
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check:
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not a[1]
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test "iterating words":
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for bitCount in [8, 3, 7, 8, 14, 15, 16, 19, 260]:
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checkpoint &"trying bit count {bitCount}"
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var
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a = BitSeq.init(bitCount)
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b = BitSeq.init(bitCount)
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bitsInWord = sizeof(uint) * 8
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expectedWordCount = (bitCount div bitsInWord) + 1
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for i in 0 ..< expectedWordCount:
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let every3rdBit = i * sizeof(uint) * 8 + 2
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a[every3rdBit] = true
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b[every3rdBit] = true
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for word in words(a):
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check word == 4
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word = 2
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for wa, wb in words(a, b):
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check wa == 2 and wb == 4
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wa = 1
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wb = 2
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for i in 0 ..< expectedWordCount:
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for j in 0 ..< bitsInWord:
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let bitPos = i * bitsInWord + j
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if bitPos < bitCount:
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check a[j] == (j == 0)
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check b[j] == (j == 1)
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test "overlaps":
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for bitCount in [1, 62, 63, 64, 91, 127, 128, 129]:
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checkpoint &"trying bit count {bitCount}"
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var
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a = BitSeq.init(bitCount)
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b = BitSeq.init(bitCount)
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for pos in [4, 8, 9, 12, 29, 32, 63, 64, 67]:
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if pos + 2 < bitCount:
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a.setBit(pos)
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b.setBit(pos + 2)
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check:
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not a.overlaps(b)
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not b.overlaps(a)
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a.countOverlap(b) == 0
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