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Error with scalacheck on shrinking classes with assert
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| Testing started at 15:02 ... | |
| Id.apply(7982e330-7daf-4cbd-a299-67af73ad24de) | |
| Generated: Test(Id(7982e330-7daf-4cbd-a299-67af73ad24de),,464053996) | |
| Id.apply(7982e330-7daf-4cbd) | |
| TestFailedException was thrown during property evaluation. | |
| Message: TestSpec.this.Id.isValid(Id.this.value) was false Invalid Id: 7982e330-7daf-4cbd | |
| Location: (TestSpec.scala:16) | |
| Occurred when passed generated values ( | |
| ) | |
| ScalaTestFailureLocation: com.criteo.hadoop.mumak.core.domain.TestSpec$$anonfun$2 at (TestSpec.scala:29) | |
| org.scalatest.exceptions.GeneratorDrivenPropertyCheckFailedException: TestFailedException was thrown during property evaluation. | |
| Message: TestSpec.this.Id.isValid(Id.this.value) was false Invalid Id: 7982e330-7daf-4cbd | |
| Location: (TestSpec.scala:16) | |
| Occurred when passed generated values ( | |
| ) | |
| at org.scalatest.enablers.CheckerAsserting$$anon$2.indicateFailure(CheckerAsserting.scala:224) | |
| at org.scalatest.enablers.CheckerAsserting$$anon$2.indicateFailure(CheckerAsserting.scala:220) | |
| at org.scalatest.enablers.UnitCheckerAsserting$CheckerAssertingImpl.check(CheckerAsserting.scala:141) | |
| at org.scalatest.prop.GeneratorDrivenPropertyChecks$class.forAll(GeneratorDrivenPropertyChecks.scala:851) | |
| at com.criteo.hadoop.mumak.core.domain.TestSpec.forAll(TestSpec.scala:12) | |
| at com.criteo.hadoop.mumak.core.domain.TestSpec$$anonfun$2.apply(TestSpec.scala:29) | |
| at com.criteo.hadoop.mumak.core.domain.TestSpec$$anonfun$2.apply(TestSpec.scala:29) | |
| at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85) | |
| at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104) | |
| at org.scalatest.Transformer.apply(Transformer.scala:22) | |
| at org.scalatest.Transformer.apply(Transformer.scala:20) | |
| at org.scalatest.FunSpecLike$$anon$1.apply(FunSpecLike.scala:454) | |
| at org.scalatest.TestSuite$class.withFixture(TestSuite.scala:196) | |
| at org.scalatest.FunSpec.withFixture(FunSpec.scala:1630) | |
| at org.scalatest.FunSpecLike$class.invokeWithFixture$1(FunSpecLike.scala:451) | |
| at org.scalatest.FunSpecLike$$anonfun$runTest$1.apply(FunSpecLike.scala:464) | |
| at org.scalatest.FunSpecLike$$anonfun$runTest$1.apply(FunSpecLike.scala:464) | |
| at org.scalatest.SuperEngine.runTestImpl(Engine.scala:289) | |
| at org.scalatest.FunSpecLike$class.runTest(FunSpecLike.scala:464) | |
| at org.scalatest.FunSpec.runTest(FunSpec.scala:1630) | |
| at org.scalatest.FunSpecLike$$anonfun$runTests$1.apply(FunSpecLike.scala:497) | |
| at org.scalatest.FunSpecLike$$anonfun$runTests$1.apply(FunSpecLike.scala:497) | |
| at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:396) | |
| at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:384) | |
| at scala.collection.immutable.List.foreach(List.scala:392) | |
| at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:384) | |
| at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:379) | |
| at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:461) | |
| at org.scalatest.FunSpecLike$class.runTests(FunSpecLike.scala:497) | |
| at org.scalatest.FunSpec.runTests(FunSpec.scala:1630) | |
| at org.scalatest.Suite$class.run(Suite.scala:1147) | |
| at org.scalatest.FunSpec.org$scalatest$FunSpecLike$$super$run(FunSpec.scala:1630) | |
| at org.scalatest.FunSpecLike$$anonfun$run$1.apply(FunSpecLike.scala:501) | |
| at org.scalatest.FunSpecLike$$anonfun$run$1.apply(FunSpecLike.scala:501) | |
| at org.scalatest.SuperEngine.runImpl(Engine.scala:521) | |
| at org.scalatest.FunSpecLike$class.run(FunSpecLike.scala:501) | |
| at org.scalatest.FunSpec.run(FunSpec.scala:1630) | |
| at org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:45) | |
| at org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$1.apply(Runner.scala:1340) | |
| at org.scalatest.tools.Runner$$anonfun$doRunRunRunDaDoRunRun$1.apply(Runner.scala:1334) | |
| at scala.collection.immutable.List.foreach(List.scala:392) | |
| at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:1334) | |
| at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1011) | |
| at org.scalatest.tools.Runner$$anonfun$runOptionallyWithPassFailReporter$2.apply(Runner.scala:1010) | |
| at org.scalatest.tools.Runner$.withClassLoaderAndDispatchReporter(Runner.scala:1500) | |
| at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:1010) | |
| at org.scalatest.tools.Runner$.run(Runner.scala:850) | |
| at org.scalatest.tools.Runner.run(Runner.scala) | |
| at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2(ScalaTestRunner.java:131) | |
| at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:28) | |
| Caused by: org.scalatest.exceptions.TestFailedException: TestSpec.this.Id.isValid(Id.this.value) was false Invalid Id: 7982e330-7daf-4cbd | |
| at org.scalatest.Assertions$class.newAssertionFailedException(Assertions.scala:528) | |
| at org.scalatest.FunSpec.newAssertionFailedException(FunSpec.scala:1630) | |
| at org.scalatest.Assertions$AssertionsHelper.macroAssert(Assertions.scala:501) | |
| at com.criteo.hadoop.mumak.core.domain.TestSpec$Id.<init>(TestSpec.scala:16) | |
| at com.criteo.hadoop.mumak.core.domain.TestSpec$$anonfun$2$anon$derivedShrink$macro$42$1$anon$macro$36$1.from(TestSpec.scala:29) | |
| at com.criteo.hadoop.mumak.core.domain.TestSpec$$anonfun$2$anon$derivedShrink$macro$42$1$anon$macro$36$1.from(TestSpec.scala:29) | |
| at org.scalacheck.derive.MkShrink$$anonfun$genericProduct$1$$anonfun$apply$1.apply(MkShrink.scala:41) | |
| at org.scalacheck.derive.MkShrink$$anonfun$genericProduct$1$$anonfun$apply$1.apply(MkShrink.scala:41) | |
| at scala.collection.immutable.Stream.map(Stream.scala:418) | |
| at org.scalacheck.derive.MkShrink$$anonfun$org$scalacheck$derive$MkShrink$$lazyxmap$1.apply(MkShrink.scala:32) | |
| at org.scalacheck.derive.MkShrink$$anonfun$org$scalacheck$derive$MkShrink$$lazyxmap$1.apply(MkShrink.scala:31) | |
| at org.scalacheck.Shrink$$anon$1.shrink(Shrink.scala:41) | |
| at org.scalacheck.derive.MkHListShrink$$anonfun$hcons$1$$anonfun$apply$7.apply(MkShrink.scala:78) | |
| at org.scalacheck.derive.MkHListShrink$$anonfun$hcons$1$$anonfun$apply$7.apply(MkShrink.scala:76) | |
| at org.scalacheck.Shrink$$anon$1.shrink(Shrink.scala:41) | |
| at org.scalacheck.derive.MkShrink$$anonfun$org$scalacheck$derive$MkShrink$$lazyxmap$1.apply(MkShrink.scala:32) | |
| at org.scalacheck.derive.MkShrink$$anonfun$org$scalacheck$derive$MkShrink$$lazyxmap$1.apply(MkShrink.scala:31) | |
| at org.scalacheck.Shrink$$anon$1.shrink(Shrink.scala:41) | |
| at org.scalacheck.Shrink$.shrink(Shrink.scala:45) | |
| at org.scalacheck.Prop$$anonfun$forAll$9.apply(Prop.scala:862) | |
| at org.scalacheck.Prop$$anonfun$forAll$9.apply(Prop.scala:862) | |
| at org.scalacheck.Prop$$anonfun$forAllShrink$1.shrinker$1(Prop.scala:727) | |
| at org.scalacheck.Prop$$anonfun$forAllShrink$1.apply(Prop.scala:751) | |
| at org.scalacheck.Prop$$anonfun$forAllShrink$1.apply(Prop.scala:706) | |
| at org.scalacheck.Prop$$anonfun$apply$5.apply(Prop.scala:292) | |
| at org.scalacheck.Prop$$anonfun$apply$5.apply(Prop.scala:291) | |
| at org.scalacheck.PropFromFun.apply(Prop.scala:22) | |
| at org.scalacheck.Test$.org$scalacheck$Test$$workerFun$1(Test.scala:294) | |
| at org.scalacheck.Test$$anonfun$3.apply(Test.scala:323) | |
| at org.scalacheck.Test$$anonfun$3.apply(Test.scala:323) | |
| at org.scalacheck.Platform$.runWorkers(Platform.scala:40) | |
| at org.scalacheck.Test$.check(Test.scala:323) | |
| at org.scalatest.enablers.UnitCheckerAsserting$CheckerAssertingImpl.check(CheckerAsserting.scala:89) | |
| ... 47 more | |
| Process finished with exit code 0 |
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| import java.util.UUID | |
| import org.scalacheck.ScalacheckShapeless._ | |
| import org.scalacheck.{Arbitrary, Gen} | |
| import org.scalatest.prop.PropertyChecks | |
| import org.scalatest.{FunSpec, Matchers} | |
| import scala.util.Try | |
| class TestSpec extends FunSpec with Matchers with PropertyChecks { | |
| case class Id(value: String) { | |
| println(s"Id.apply($value)") | |
| assert(Id.isValid(value), s"Invalid Id: $value") | |
| } | |
| object Id { | |
| def isValid(value: String): Boolean = Try(UUID.fromString(value)).isSuccess | |
| } | |
| case class Test(id: Id, value: String, num: Int) | |
| implicit val aId = Arbitrary(Gen.uuid.map(id => Id(id.toString))) | |
| implicit val aTest = implicitly[Arbitrary[Test]] | |
| it("test") { | |
| forAll { t: Test => | |
| println(s"Generated: $t") | |
| true shouldBe false | |
| } | |
| } | |
| } |
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Shapeless library tries to shrink id field of Test as it would shrink a String, that is why it fails.
To fix your test you need to define your shrink strategy for Id type, that does not break assertion.
But in your specific case id is UUID that does not make sense to shrink, so it should be empty
implicit val sId = Shrink[Id](_ => Stream.empty[Id])