test(codegen-kotlin): KotlinOutputCompilesTest — kotlin-compile-testing gate

Author: dmealing

server/java/codegen-kotlin/pom.xml

@@ -68,6 +68,13 @@
       <version>1.6.0</version>
       <scope>test</scope>
     </dependency>
+    <!-- Required at test scope so kotlin-compile-testing can resolve @Serializable on generated code -->
+    <dependency>
+      <groupId>org.jetbrains.kotlinx</groupId>
+      <artifactId>kotlinx-serialization-core-jvm</artifactId>
+      <version>1.7.3</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

server/java/codegen-kotlin/src/test/kotlin/com/metaobjects/generator/kotlin/KotlinOutputCompilesTest.kt

@@ -0,0 +1,47 @@
+package com.metaobjects.generator.kotlin
+
+import com.metaobjects.metadata.ktx.loadString
+import com.tschuchort.compiletesting.KotlinCompilation
+import com.tschuchort.compiletesting.SourceFile
+import java.nio.file.Files
+import kotlin.io.path.isRegularFile
+import kotlin.io.path.readText
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+@OptIn(org.jetbrains.kotlin.compiler.plugin.ExperimentalCompilerApi::class)
+class KotlinOutputCompilesTest {
+
+    private val fixture = """{
+      "metadata.root": { "package": "acme::demo", "children": [
+        { "object.entity": { "name": "Author", "children": [
+            { "field.long":   { "name": "id" } },
+            { "field.string": { "name": "name", "@maxLength": 100, "@required": true } }
+        ] } }
+      ] }
+    }""".trimIndent()
+
+    @Test fun `generated Author kt compiles`() {
+        val outDir = Files.createTempDirectory("compile-")
+        try {
+            val gen = KotlinEntityGenerator()
+            gen.setArgs(mapOf("outputDir" to outDir.toString()))
+            gen.execute(loadString("test", fixture))
+
+            val sources = Files.walk(outDir).filter { it.isRegularFile() }
+                .map { SourceFile.kotlin(it.fileName.toString(), it.readText()) }
+                .toList()
+
+            val result = KotlinCompilation().apply {
+                this.sources = sources
+                inheritClassPath = true   // include kotlinx.serialization-runtime + Exposed if on the test classpath
+                messageOutputStream = System.out
+            }.compile()
+
+            assertEquals(KotlinCompilation.ExitCode.OK, result.exitCode,
+                "generated Kotlin failed to compile:\n${result.messages}")
+        } finally {
+            outDir.toFile().deleteRecursively()
+        }
+    }
+}