test: add a test for firstIndex

build.gradle.kts

@@ -1,6 +1,7 @@
 @Suppress("DSL_SCOPE_VIOLATION")
 plugins {
     scala
+    alias(libs.plugins.scalatest)
     alias(libs.plugins.kotlin.jvm)
     alias(libs.plugins.dokka)
     alias(libs.plugins.kotlin.qa)
@@ -14,6 +15,8 @@ repositories {
 dependencies {
     implementation(libs.kotlin.stdlib)
     implementation(libs.scala.stdlib)
+    testRuntimeOnly(libs.flexmark) // needed to make it works scalatest
+    testImplementation(libs.scalatest)
     testImplementation(libs.bundles.kotlin.testing)
 }
 

gradle/libs.versions.toml

@@ -6,6 +6,8 @@ mockito = "5.8.0"
 
 [libraries]
 scala-stdlib = { module = "org.scala-lang:scala3-library_3", version.ref = "scala" }
+scalatest = "org.scalatest:scalatest_3:3.2.17"
+flexmark = "com.vladsch.flexmark:flexmark-all:0.64.8"
 kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "kotlin" }
 kotest-assertions-core-jvm = { module = "io.kotest:kotest-assertions-core-jvm", version.ref = "kotest" }
 kotlinx-coroutines-core = "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3"
@@ -16,6 +18,7 @@ mockito-core = { module = "org.mockito:mockito-core", version.ref = "mockito" }
 kotlin-testing = [ "kotest-junit5-jvm", "kotest-assertions-core-jvm", "mockito-core" ]
 
 [plugins]
+scalatest = "com.github.maiflai.scalatest:0.32"
 dokka = "org.jetbrains.dokka:1.9.10"
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlin-qa = "org.danilopianini.gradle-kotlin-qa:0.57.1"

src/main/scala/io/github/tassiLuca/boundaries/BOptional.scala

@@ -18,6 +18,7 @@ object optional:
 
 @main def useBOptional(): Unit =
   import optional.*
+
   def firstColumn[T](xss: List[List[T]]): Option[List[T]] =
     optional:
       xss.map(_.headOption.?)

src/main/scala/io/github/tassiLuca/boundaries/BoundaryTests.scala → src/main/scala/io/github/tassiLuca/boundaries/BoundaryExamples.scala

@@ -3,12 +3,9 @@ package io.github.tassiLuca.boundaries
 import scala.util.boundary
 import scala.util.boundary.break
 
-object BoundaryTests extends App:
+object BoundaryExamples extends App:
 
   def firstIndex[T](xs: List[T], elem: T): Int =
     boundary:
       for (x, i) <- xs.zipWithIndex do if x == elem then break(i)
       -1
-
-  println(firstIndex(List(1, 2, 3, 4), 4))
-  println(firstIndex(List(1, 2, 3, 4), 0))

src/test/scala/io/github/tassiLuca/boundaries/BoundaryExamplesTest.scala

@@ -0,0 +1,11 @@
+package io.github.tassiLuca.boundaries
+
+import io.github.tassiLuca.boundaries.BoundaryExamples.firstIndex
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers.shouldBe
+
+class BoundaryExamplesTest extends AnyFlatSpec:
+  "BoundaryExamples.firstIndex" should "return the first index of an item in the list or -1 if not present" in {
+    firstIndex(List(1, 2, 3, 4), 4) shouldBe 3
+    firstIndex(List(1, 2, 3, 4), 0) shouldBe -1
+  }