Add checking message ids uniqueness

.gitignore

@@ -72,4 +72,4 @@ gradle-app.setting
 classes
 .DS_Store
 .idea/libraries-with-intellij-classes.xml
-dist/messages.json
+dist/v*.json

generator/build.gradle

@@ -10,4 +10,14 @@ mainClassName = 'MainKt'
 dependencies {
     implementation project(":pojos")
     implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.0"
+
+    testImplementation platform("org.junit:junit-bom:5.8.1")
+    testImplementation "org.junit.jupiter:junit-jupiter"
+}
+
+test {
+    useJUnitPlatform()
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
 }

generator/src/main/kotlin/main.kt

@@ -3,6 +3,8 @@ import kotlinx.serialization.json.Json
 import java.io.File
 
 fun main() {
+    checkIdUniqueness(messages)
+
     val json = Json.encodeToString(messages)
 
     File("../dist/v1.json").writeText(json)

generator/src/main/kotlin/utils.kt

@@ -0,0 +1,9 @@
+import io.github.wulkanowy.messages.pojo.Message
+
+fun checkIdUniqueness(list: List<Message>) {
+    val duplicates = list.groupingBy { it.id }.eachCount().filter { it.value > 1 }
+
+    if (duplicates.isNotEmpty()) {
+        throw IllegalArgumentException("Found ${duplicates.size} duplicated id(s) in messages: $duplicates")
+    }
+}

generator/src/test/kotlin/UtilsTest.kt

@@ -0,0 +1,42 @@
+import io.github.wulkanowy.messages.pojo.Message
+import io.github.wulkanowy.messages.pojo.MessageType
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertDoesNotThrow
+import org.junit.jupiter.api.assertThrows
+
+class UtilsTest {
+
+    @Test
+    fun `check message id uniqueness when really duplicates`() {
+        val list = listOf(
+            createMessage(1),
+            createMessage(2),
+            createMessage(2),
+            createMessage(3),
+        )
+
+        assertThrows<IllegalArgumentException> {
+            checkIdUniqueness(list)
+        }
+    }
+
+    @Test
+    fun `check message id uniqueness when there is no duplicates`() {
+        val list = listOf(
+            createMessage(1),
+            createMessage(2),
+            createMessage(3),
+        )
+
+        assertDoesNotThrow {
+            checkIdUniqueness(list)
+        }
+    }
+
+    private fun createMessage(id: Long) = Message(
+        id = id,
+        title = "",
+        content = "",
+        type = MessageType.DASHBOARD_MESSAGE,
+    )
+}

pojos/src/main/kotlin/Message.kt

@@ -4,7 +4,7 @@ import kotlinx.serialization.Serializable
 
 @Serializable
 data class Message(
-    val id: Int,
+    val id: Long,
     val title: String,
     val content: String,
     val versionMin: Int? = null,