Investigate 25 slowest test in Arrow

[nomisRev]

This is a list of the 25 slowest tests in Arrow reported by Gradle Scan. Feel free to pick any of these tests and comment below which one you're working on. A lot of these tests can probably be refactored to run a lot faster without impacting coverage.

• flatMapMapKTest:arrow-core:iosX64Test | PASSED | 37.424s
• repeatAsFlow is stack-safeScheduleTest:arrow-fx-coroutines:iosX64Test | PASSED | 17.292s
• ior bindIorSpec.Concurrent - arrow:arrow-core:iosX64Test | PASSED | 13.377s
• Iso Law: compose modifyMapTest:arrow-optics:iosX64Test | PASSED | 10.871s
• (1) Lens law: compose modifyNonEmptyListTest:arrow-optics:iosX64Test | PASSED | 10.426s
• (1) Lens law: set getNonEmptyListTest:arrow-optics:iosX64Test | PASSED | 10.008s
• Iso Law: compose modifyMapTest:arrow-optics:watchosX64Test | PASSED | 9.866s
• (1) Lens law: is set idempotentNonEmptyListTest:arrow-optics:iosX64Test | PASSED | 8.184s
• can align sequences - 3SequenceKTest:arrow-core:iosX64Test | PASSED | 7.150s
• can align sequences - 1SequenceKTest:arrow-core:iosX64Test | PASSED | 7.075s
• DSL is generated for complex model with Every()arrow.optics.plugin.DSLTests:arrow-optics-ksp-plugin:test | PASSED | 39.170s
• should be stack safe for successful async tasksarrow.fx.coroutines.CircuitBreakerTest:arrow-fx-coroutines:jvmTest | PASSED | 11.974s
• should be stack safe for successful async tasksarrow.fx.resilience.CircuitBreakerTest:arrow-fx-resilience:jvmTest | PASSED | 11.136s
• should return IOError when no responsearrow.retrofit.adapter.either.networkhandling.NetworkEitherCallAdapterTestSuite:arrow-core-retrofit:test | PASSED | 10.889s
• DSL is generated for complex model with At()arrow.optics.plugin.DSLTests:arrow-optics-ksp-plugin:test | PASSED | 10.293s
• (2) should return IOError when no responsearrow.retrofit.adapter.either.networkhandling.NetworkEitherCallAdapterTestSuite:arrow-core-retrofit:test | PASSED | 10.041s
• (1) should return IOError when no responsearrow.retrofit.adapter.either.networkhandling.NetworkEitherCallAdapterTestSuite:arrow-core-retrofit:test | PASSED | 9.448s
• parMapN 8 returns to original context on failurearrow.fx.coroutines.ParMap8JvmTest:arrow-fx-coroutines:jvmTest | PASSED | 4.927s
• stack safety stress testarrow.core.EvalJvmTest:arrow-core:jvmTest | PASSED | 4.871s
• DSL works with extensions in the file, issue ["BUG"] Optics and typealias usage in the same file fails with "Duplicate JVM class name" #2803()arrow.optics.plugin.DSLTests:arrow-optics-ksp-plugin:test | PASSED | 4.760s
• lenses for field, setarrow.optics.ReflectionTest:arrow-optics-reflect:test | PASSED | 4.294s
• race3 returns to original contextarrow.fx.coroutines.RaceNJvmTest:arrow-fx-coroutines:jvmTest | PASSED | 3.771s |  
• Isos will be generated for data class with secondary constructors()arrow.optics.plugin.IsoTests:arrow-optics-ksp-plugin:test | PASSED | 3.013s
• Isos will be generated for data class()arrow.optics.plugin.IsoTests:arrow-optics-ksp-plugin:test

[abendt]

MapKTest.flatMap() has been fixed as part of #2999 and can be removed from the list.

new time is: ~0.5s 🚀

https://scans.gradle.com/s/ogbwpswsaig4q/tests/:arrow-core:iosX64Test/MapKTest/flatMap?top-execution=1

[serras]

Many of those are now obsolete