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Fix Float shrinker skipping some values #20

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Merged
x-sheep merged 1 commit into from
Jan 23, 2026
Merged

Fix Float shrinker skipping some values #20

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2 changes: 1 addition & 1 deletion Sources/PropertyBased/Shrink+Float.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ extension Shrink {
current = bound
end = from

leap = (from / 2) - (bound / 2)
leap = from - bound
if leap.isNaN {
current = .nan
} else if leap.isInfinite {
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10 changes: 10 additions & 0 deletions Tests/PropertyBasedTests/ShrinkTests+Float.swift
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Expand Up @@ -24,6 +24,12 @@ import Testing
try #require(results.count > 1)
#expect(results.first == end)
#expect(!results.contains(start))

if start > end {
#expect(results.allSatisfy { $0 >= end })
} else {
#expect(results.allSatisfy { $0 <= end })
}
}

@Test func testShrinkWithNan() throws {
Expand Down Expand Up @@ -51,5 +57,9 @@ import Testing

let shrink5 = (20).shrink(within: 1.5...10)
#expect(shrink5.current == 1.5)

var shrink6 = (10.0).shrink(towards: 0)
_ = shrink6.next()
#expect(shrink6.current == 5)
}
}