Add tests for nested classes in Kotlin as Java

plugins/kotlin-as-java/src/test/kotlin/DRITranslationTest.kt

@@ -0,0 +1,125 @@
+package kotlinAsJavaPlugin
+
+
+import org.jetbrains.dokka.base.testApi.testRunner.BaseAbstractTest
+import org.jetbrains.dokka.model.DClass
+import org.jetbrains.dokka.model.DEnum
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+
+class DRITranslationTest : BaseAbstractTest() {
+    val configuration = dokkaConfiguration {
+        sourceSets {
+            sourceSet {
+                sourceRoots = listOf("src/")
+                classpath += jvmStdlibPath!!
+            }
+        }
+    }
+
+    @Test
+    fun `should correctly handle nested classes`() {
+        testInline(
+                """
+            |/src/main/kotlin/kotlinAsJavaPlugin/sample.kt
+            |package kotlinAsJavaPlugin
+            |class A {
+            |   class B(val x: String)
+            |}
+            |class C {
+            |   class B(val x: String)
+            |}
+        """.trimMargin(),
+                configuration,
+        ) {
+            documentablesTransformationStage = { module ->
+                val nestedClasslikesDRIs = module.packages.flatMap { it.classlikes }.flatMap { it.classlikes }.map { it.dri }
+                val driRegex = "[AC]\\.B".toRegex()
+
+                nestedClasslikesDRIs.forEach { dri ->
+                    assertTrue(driRegex.matches(dri.classNames.toString()))
+                }
+            }
+        }
+    }
+
+    @Test
+    fun `should correctly handle interface methods`() {
+        testInline(
+                """
+            |/src/main/kotlin/kotlinAsJavaPlugin/sample.kt
+            |package kotlinAsJavaPlugin
+            |interface A {
+            |   fun b()
+            |}
+        """.trimMargin(),
+                configuration,
+        ) {
+            documentablesTransformationStage = { module ->
+                val nestedFunctionDRI = module.packages.flatMap { it.classlikes }.flatMap { it.functions }.filter { it.name == "b" }.map { it.dri }.single()
+
+                assertTrue(nestedFunctionDRI.classNames == "A")
+            }
+        }
+    }
+
+    @Test
+    fun `should correctly handle object methods`() {
+        testInline(
+                """
+            |/src/main/kotlin/kotlinAsJavaPlugin/sample.kt
+            |package kotlinAsJavaPlugin
+            |object A {
+            |   fun b() {}
+            |}
+        """.trimMargin(),
+                configuration,
+        ) {
+            documentablesTransformationStage = { module ->
+                val nestedFunctionDRI = module.packages.flatMap { it.classlikes }.flatMap { it.functions }.filter { it.name == "b" }.map { it.dri }.single()
+
+                assertTrue(nestedFunctionDRI.classNames == "A")
+            }
+        }
+    }
+
+    @Test
+    fun `should correctly handle enum functions`() {
+        testInline(
+                """
+            |/src/main/kotlin/kotlinAsJavaPlugin/sample.kt
+            |package kotlinAsJavaPlugin
+            |enum class A(private val x: Int) {
+            |   X(0);
+            |   fun b() = x
+            |}
+        """.trimMargin(),
+                configuration,
+        ) {
+            documentablesTransformationStage = { module ->
+                val nestedFunctionDRI = (module.packages.single().classlikes.single() as DEnum).functions.filter { it.name == "b" }.map { it.dri }.single()
+
+                assertTrue(nestedFunctionDRI.classNames == "A")
+            }
+        }
+    }
+
+    @Test
+    fun `should correctly handle nested classes' constructors`() {
+        testInline(
+                """
+            |/src/main/kotlin/kotlinAsJavaPlugin/sample.kt
+            |package kotlinAsJavaPlugin
+            |class A {
+            |   class B(val x: String)
+            |}
+        """.trimMargin(),
+                configuration,
+        ) {
+            documentablesTransformationStage = { module ->
+                val constructorDRI = (module.packages.flatMap { it.classlikes }.flatMap { it.classlikes }.single() as DClass).constructors.single().dri
+                assertTrue(constructorDRI.classNames == "A.B")
+            }
+        }
+    }
+}