test: added common test cases for cache4k (#3501)

arrow-libs/core/arrow-cache4k/build.gradle.kts

@@ -2,6 +2,7 @@
 
 import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi
 import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 
 plugins {
@@ -15,7 +16,7 @@ apply(from = property("ANIMALSNIFFER_MPP"))
 
 java {
   toolchain {
-    languageVersion.set(JavaLanguageVersion.of(8))
+    languageVersion.set(JavaLanguageVersion.of(17))
   }
 }
 
@@ -29,6 +30,13 @@ kotlin {
         api(libs.cache4k)
       }
     }
+    commonTest {
+      dependencies {
+        implementation(libs.kotlin.test)
+        implementation(libs.kotest.assertionsCore)
+        implementation(libs.coroutines.test)
+      }
+    }
   }
 
   jvm {
@@ -75,3 +83,8 @@ tasks.named<Jar>("jvmJar").configure {
     attributes["Automatic-Module-Name"] = "arrow.cache4k"
   }
 }
+
+// enables context receivers for Jvm Tests
+tasks.named<KotlinCompile>("compileTestKotlinJvm") {
+  compilerOptions.freeCompilerArgs.add("-Xcontext-receivers")
+}

arrow-libs/core/arrow-cache4k/src/commonTest/kotlin/arrow/core/Cache4kTest.kt

@@ -0,0 +1,25 @@
+package arrow.core
+
+import io.kotest.matchers.shouldBe
+import kotlinx.coroutines.test.runTest
+import kotlin.test.Test
+import kotlin.time.Duration
+
+class Cache4kTest {
+
+  @Test fun cacheShouldReturnSavedValueByKeyCorrectly() = runTest {
+    val cache = Cache4kMemoizationCache<String, Int>(buildCache4K { expireAfterAccess(Duration.INFINITE) })
+    val expectedKey = "user:age:userId:5"
+    val expectedValue = 32
+
+    cache.set(expectedKey, expectedValue)
+    cache.get(expectedKey) shouldBe expectedValue
+  }
+
+  @Test fun cacheShouldReturnNullCauseTryGetByUnsavedKey() = runTest {
+    val cache = Cache4kMemoizationCache<String, Int>(buildCache4K { expireAfterAccess(Duration.INFINITE) })
+    val expectedKey = "user:name:userId:5"
+
+    cache.get(expectedKey) shouldBe null
+  }
+}