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Specific commutativity and associativity tests for BigDecimal #3325

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merged 2 commits into from
Mar 20, 2020
Merged

Specific commutativity and associativity tests for BigDecimal #3325

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61fc27f
Add tests for commutativity for BigDecimal operations
travisbrown Feb 26, 2020
dc5d48e
Remove now-unnecessary brackets
travisbrown Feb 26, 2020
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27 changes: 23 additions & 4 deletions kernel-laws/shared/src/test/scala/cats/kernel/laws/LawTests.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -313,10 +313,29 @@ class Tests extends TestsConfig with AnyFunSuiteLike with FunSuiteDiscipline wit
checkAll("Hash[SortedMap[Int, String]]", HashTests[SortedMap[Int, String]].hash)
checkAll("Hash[Queue[Int]", HashTests[Queue[Int]].hash)

{
checkAll("Order[BigDecimal]", OrderTests[BigDecimal].order)
checkAll("CommutativeGroup[BigDecimal]", CommutativeGroupTests[BigDecimal].commutativeGroup)
checkAll("CommutativeGroup[BigDecimal]", SerializableTests.serializable(CommutativeGroup[BigDecimal]))
checkAll("Order[BigDecimal]", OrderTests[BigDecimal].order)
checkAll("CommutativeGroup[BigDecimal]", CommutativeGroupTests[BigDecimal].commutativeGroup)
checkAll("CommutativeGroup[BigDecimal]", SerializableTests.serializable(CommutativeGroup[BigDecimal]))

test("CommutativeGroup[BigDecimal]'s combine should be associative for known problematic cases (#3303)") {
import java.math.MathContext

val one = BigDecimal("1", MathContext.DECIMAL32)
val small = BigDecimal("0.00001111111", MathContext.DECIMAL32)
val xs = one :: List.fill(10)(small)
val combineRight = xs.reduceRight(CommutativeGroup[BigDecimal].combine)
val combineLeft = xs.reduceLeft(CommutativeGroup[BigDecimal].combine)

assert(combineRight === combineLeft)
}

test("CommutativeGroup[BigDecimal]'s combine should be commutative for known problematic cases (#3303)") {
import java.math.MathContext

val one = BigDecimal("1")
val small = BigDecimal("1e-7", MathContext.DECIMAL32)

assert(CommutativeGroup[BigDecimal].combine(one, small) === CommutativeGroup[BigDecimal].combine(small, one))
}

checkAll("Band[(Int, Int)]", BandTests[(Int, Int)].band)
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