feat: Add unit testing dependencies

Add Junit 5 and Mockk test dependencies with simple test

app/build.gradle.kts

@@ -15,8 +15,12 @@ plugins {
     id("org.jmailen.kotlinter")
     id("io.gitlab.arturbosch.detekt")
     id("com.google.devtools.ksp") version "2.0.0-1.0.22" apply true
+    id("de.mannodermaus.android-junit5") version "1.11.2.0"
 }
+
 val kotlinVersion by extra("2.0.0")
+val junit5Version by extra("5.11.2")
+val mockkVersion by extra("1.13.13")
 
 android {
     compileSdk = 34
@@ -87,6 +91,7 @@ android {
         buildUponDefaultConfig = true
         allRules = false
         config = rootProject.files("detekt.yml")
+
     }
 
     kotlinter {
@@ -115,6 +120,10 @@ dependencies {
     implementation("androidx.cardview:cardview:1.0.0")
     implementation("androidx.viewpager2:viewpager2:1.1.0")
 
+    testImplementation("org.junit.jupiter:junit-jupiter-api:$junit5Version")
+    testImplementation("io.mockk:mockk:$mockkVersion")
+    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:$junit5Version")
+
     api("joda-time:joda-time:2.10.13")
     api("com.github.tibbi:RecyclerView-FastScroller:e7d3e150c4")
     api("com.github.tibbi:reprint:2cb206415d")

app/src/test/kotlin/helpers/AlphanumericComparatorTest.kt

@@ -0,0 +1,18 @@
+package helpers
+
+import be.scri.helpers.AlphanumericComparator
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+
+class AlphanumericComparatorTest {
+    private val subject = AlphanumericComparator()
+
+    @Test
+    fun testCompare() {
+        assertEquals(-1, subject.compare("IMG_10.png", "IMG_11.png"))
+
+        assertEquals(0, subject.compare("IMG_10.png", "IMG_10.png"))
+
+        assertEquals(1, subject.compare("IMG_11.png", "IMG_10.png"))
+    }
+}