Reflection: add test on introspection of local classes

kotlin-reflect works correctly already for Kotlin-generated local
classes and anonymous objects, but not for Java ones. This is fixed in a
subsequent commit.

 #KT-41373 In Progress

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirLightTreeBlackBoxCodegenTestGenerated.java

@@ -45305,6 +45305,22 @@ public class FirLightTreeBlackBoxCodegenTestGenerated extends AbstractFirLightTr
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
+            }
+
+            @Test
+            @TestMetadata("localClassesAndAnonymousObjects.kt")
+            public void testLocalClassesAndAnonymousObjects() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/localClasses/localClassesAndAnonymousObjects.kt");
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirPsiBlackBoxCodegenTestGenerated.java

@@ -45305,6 +45305,22 @@ public class FirPsiBlackBoxCodegenTestGenerated extends AbstractFirPsiBlackBoxCo
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
+            }
+
+            @Test
+            @TestMetadata("localClassesAndAnonymousObjects.kt")
+            public void testLocalClassesAndAnonymousObjects() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/localClasses/localClassesAndAnonymousObjects.kt");
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

compiler/testData/codegen/box/reflection/localClasses/localClassesAndAnonymousObjects.kt

@@ -0,0 +1,144 @@
+// TARGET_BACKEND: JVM
+// WITH_REFLECT
+// FILE: anonymousObjects.kt
+
+package test
+
+import kotlin.reflect.*
+import kotlin.reflect.jvm.isAccessible
+import kotlin.test.*
+
+interface I
+
+fun check(x: KClass<*>, value: Any) {
+    assertEquals(null, x.qualifiedName)
+
+    assertEquals(
+        setOf(
+            "foo", "bar",
+            "equals", "hashCode", "toString"
+        ),
+        x.members.mapTo(hashSetOf()) { it.name }
+    )
+
+    assertEquals(emptyList(), x.annotations)
+    assertEquals(emptyList(), x.nestedClasses)
+    assertEquals(null, x.objectInstance)
+    assertEquals(emptyList(), x.sealedSubclasses)
+
+    assertEquals(listOf(typeOf<I>(), typeOf<Any>()), x.supertypes)
+
+    // Local class visibility cannot be represented in Kotlin, so `KClass.visibility` is null.
+    assertEquals(null, x.visibility)
+
+    // It's not really important whether the class is considered final or open, but it shouldn't be both (or neither).
+    assertTrue(x.isFinal xor x.isOpen)
+
+    assertFalse(x.isAbstract)
+    assertFalse(x.isSealed)
+    assertFalse(x.isData)
+    assertFalse(x.isInner)
+    assertFalse(x.isCompanion)
+    assertFalse(x.isFun)
+    assertFalse(x.isValue)
+
+    assertFalse(x.isInstance(42))
+    assertTrue(x.isInstance(value))
+
+    val equals = x.members.single { it.name == "equals" } as KFunction<Boolean>
+    assertTrue(equals.call(value, value))
+
+    val foo = x.members.single { it.name == "foo" }.apply { isAccessible = true } as KFunction<String>
+    assertEquals("OK", foo.call(value))
+
+    val bar = x.members.single { it.name == "bar" }.apply { isAccessible = true } as KProperty1<Any, Int>
+    assertEquals(42, bar.get(value))
+}
+
+fun checkKotlinAnonymousObject() {
+    val anonymousObject = object : I {
+        val bar: Int = 42
+        fun foo(): String = "OK"
+    }
+    val klass = anonymousObject::class
+
+    // isAnonymousClass/simpleName behavior is different for Kotlin anonymous classes in JDK 1.8 and 9+, see KT-23072.
+    if (klass.java.isAnonymousClass) {
+        assertEquals(null, klass.simpleName)
+    } else {
+        assertEquals("anonymousObject\$1", klass.simpleName)
+    }
+
+    assertEquals(emptyList(), klass.constructors)
+
+    check(klass, anonymousObject)
+}
+
+fun checkKotlinLocalClass() {
+    class Local : I {
+        val bar: Int = 42
+        fun foo(): String = "OK"
+    }
+    val instance = Local()
+    val klass = instance::class
+
+    // simpleName behavior is different for Kotlin anonymous classes in JDK 1.8 and 9+, see KT-23072.
+    assertTrue(klass.simpleName!!.endsWith("Local"))
+
+    assertEquals(listOf("fun `<init>`(): test.`AnonymousObjectsKt\$checkKotlinLocalClass\$Local`"), klass.constructors.map { it.toString() })
+
+    check(klass, instance)
+}
+
+fun checkJavaAnonymousObject() {
+    val anonymousObject = JavaClass.anonymousObject()
+    val klass = anonymousObject::class
+
+    assertEquals(null, klass.simpleName)
+
+    assertEquals(listOf("fun `<init>`(): `JavaClass$1`"), klass.constructors.map { it.toString() })
+
+    check(klass, anonymousObject)
+}
+
+fun checkJavaLocalClass() {
+    val instance = JavaClass.localClassInstance()
+    val klass = instance::class
+
+    assertEquals("Local", klass.simpleName)
+
+    assertEquals(listOf("fun `<init>`(): Local"), klass.constructors.map { it.toString() })
+
+    check(klass, instance)
+}
+
+fun box(): String {
+    checkKotlinAnonymousObject()
+    checkKotlinLocalClass()
+
+    // TODO: fails with KotlinReflectionInternalError: Unresolved class: class JavaClass$1 (kind = null)
+    // checkJavaAnonymousObject()
+    // checkJavaLocalClass()
+
+    return "OK"
+}
+
+// FILE: JavaClass.java
+
+public class JavaClass {
+    public static Object anonymousObject() {
+        return new test.I() {
+            int bar = 42;
+            String foo() { return "OK"; }
+        };
+    }
+
+    public static Object localClassInstance() {
+        class Local implements test.I {
+            int bar = 42;
+            String foo() { return "OK"; }
+        }
+
+        return new Local();
+    }
+}

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java

@@ -42647,6 +42647,22 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM, true);
+            }
+
+            @Test
+            @TestMetadata("localClassesAndAnonymousObjects.kt")
+            public void testLocalClassesAndAnonymousObjects() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/localClasses/localClassesAndAnonymousObjects.kt");
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -45305,6 +45305,22 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
+            }
+
+            @Test
+            @TestMetadata("localClassesAndAnonymousObjects.kt")
+            public void testLocalClassesAndAnonymousObjects() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/localClasses/localClassesAndAnonymousObjects.kt");
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenWithIrInlinerTestGenerated.java

@@ -45305,6 +45305,22 @@ public class IrBlackBoxCodegenWithIrInlinerTestGenerated extends AbstractIrBlack
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
+            }
+
+            @Test
+            @TestMetadata("localClassesAndAnonymousObjects.kt")
+            public void testLocalClassesAndAnonymousObjects() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/localClasses/localClassesAndAnonymousObjects.kt");
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -36008,6 +36008,24 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             }
         }
 
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class LocalClasses extends AbstractLightAnalysisModeTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest(this::doTest, TargetBackend.JVM_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JVM_IR, true);
+            }
+
+            @TestMetadata("localClassesAndAnonymousObjects.kt")
+            public void testLocalClassesAndAnonymousObjects() throws Exception {
+                runTest("compiler/testData/codegen/box/reflection/localClasses/localClassesAndAnonymousObjects.kt");
+            }
+        }
+
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")
         @RunWith(JUnit3RunnerWithInners.class)

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirJsCodegenBoxTestGenerated.java

@@ -32537,6 +32537,16 @@ public class FirJsCodegenBoxTestGenerated extends AbstractFirJsCodegenBoxTest {
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsCodegenBoxTestGenerated.java

@@ -32537,6 +32537,16 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsES6CodegenBoxTestGenerated.java

@@ -32537,6 +32537,16 @@ public class IrJsES6CodegenBoxTestGenerated extends AbstractIrJsES6CodegenBoxTes
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/blackboxtest/FirNativeCodegenBoxTestGenerated.java

@@ -35884,6 +35884,19 @@ public class FirNativeCodegenBoxTestGenerated extends AbstractNativeCodegenBoxTe
                 }
             }
 
+            @Nested
+            @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+            @TestDataPath("$PROJECT_ROOT")
+            @Tag("frontend-fir")
+            @FirPipeline()
+            @UseExtTestCaseGroupProvider()
+            public class LocalClasses {
+                @Test
+                public void testAllFilesPresentInLocalClasses() throws Exception {
+                    KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.NATIVE, true);
+                }
+            }
+
             @Nested
             @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
             @TestDataPath("$PROJECT_ROOT")

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/blackboxtest/FirNativeCodegenBoxTestNoPLGenerated.java

@@ -36760,6 +36760,21 @@ public class FirNativeCodegenBoxTestNoPLGenerated extends AbstractNativeCodegenB
                 }
             }
 
+            @Nested
+            @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+            @TestDataPath("$PROJECT_ROOT")
+            @Tag("frontend-fir")
+            @FirPipeline()
+            @UseExtTestCaseGroupProvider()
+            @UsePartialLinkage(mode = Mode.DISABLED)
+            @Tag("no-partial-linkage-may-be-skipped")
+            public class LocalClasses {
+                @Test
+                public void testAllFilesPresentInLocalClasses() throws Exception {
+                    KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.NATIVE, true);
+                }
+            }
+
             @Nested
             @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
             @TestDataPath("$PROJECT_ROOT")

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/blackboxtest/NativeCodegenBoxTestGenerated.java

@@ -35447,6 +35447,18 @@ public class NativeCodegenBoxTestGenerated extends AbstractNativeCodegenBoxTest
                 }
             }
 
+            @Nested
+            @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+            @TestDataPath("$PROJECT_ROOT")
+            @UseExtTestCaseGroupProvider()
+            @DisabledTestsIfProperty(sourceLocations = { "compiler/testData/codegen/box/coroutines/featureIntersection/defaultExpect.kt", "compiler/testData/codegen/box/multiplatform/defaultArguments/*.kt", "compiler/testData/codegen/box/multiplatform/migratedOldTests/*.kt", "compiler/testData/codegen/boxInline/multiplatform/defaultArguments/receiversAndParametersInLambda.kt" }, property = ClassLevelProperty.TEST_MODE, propertyValue = "ONE_STAGE_MULTI_MODULE")
+            public class LocalClasses {
+                @Test
+                public void testAllFilesPresentInLocalClasses() throws Exception {
+                    KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.NATIVE, true);
+                }
+            }
+
             @Nested
             @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
             @TestDataPath("$PROJECT_ROOT")

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/blackboxtest/NativeCodegenBoxTestNoPLGenerated.java

@@ -35885,6 +35885,19 @@ public class NativeCodegenBoxTestNoPLGenerated extends AbstractNativeCodegenBoxT
                 }
             }
 
+            @Nested
+            @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+            @TestDataPath("$PROJECT_ROOT")
+            @UseExtTestCaseGroupProvider()
+            @UsePartialLinkage(mode = Mode.DISABLED)
+            @Tag("no-partial-linkage-may-be-skipped")
+            public class LocalClasses {
+                @Test
+                public void testAllFilesPresentInLocalClasses() throws Exception {
+                    KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^(.+)\\.kt$"), null, TargetBackend.NATIVE, true);
+                }
+            }
+
             @Nested
             @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
             @TestDataPath("$PROJECT_ROOT")

wasm/wasm.tests/tests-gen/org/jetbrains/kotlin/wasm/test/FirWasmCodegenBoxTestGenerated.java

@@ -32345,6 +32345,16 @@ public class FirWasmCodegenBoxTestGenerated extends AbstractFirWasmCodegenBoxTes
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.WASM, true);
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")

wasm/wasm.tests/tests-gen/org/jetbrains/kotlin/wasm/test/K1WasmCodegenBoxTestGenerated.java

@@ -32345,6 +32345,16 @@ public class K1WasmCodegenBoxTestGenerated extends AbstractK1WasmCodegenBoxTest
             }
         }
 
+        @Nested
+        @TestMetadata("compiler/testData/codegen/box/reflection/localClasses")
+        @TestDataPath("$PROJECT_ROOT")
+        public class LocalClasses {
+            @Test
+            public void testAllFilesPresentInLocalClasses() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/codegen/box/reflection/localClasses"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.WASM, true);
+            }
+        }
+
         @Nested
         @TestMetadata("compiler/testData/codegen/box/reflection/mapping")
         @TestDataPath("$PROJECT_ROOT")