8309574: Improve core reflection tests for JEP 445

Reviewed-by: mchung

Author: jddarcy

test/jdk/java/lang/Class/UnnamedClass/TestUnnamedClass.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8306112
+ * @enablePreview
+ * @build Unnamed TestUnnamedClass
+ * @run main TestUnnamedClass
+ * @summary Basic checks of java.lang.Class support for unnamed classes
+ */
+
+import java.lang.reflect.Modifier;
+
+public class TestUnnamedClass {
+    public static void main(String... args) throws Exception {
+        Class<?> unnamedClass = Class.forName("Unnamed");
+
+        /*
+         * From JEP 445 JLS changes:
+         *
+         * "An unnamed class compilation unit implicitly declares a class that satisfies the following
+         * properties:
+         * It is always a top level class.
+         * It is always an unnamed class (it has no canonical or fully qualified name (6.7)).
+         * It is never abstract (8.1.1.1).
+         * It is always final (8.1.1.2).
+         * It is always a member of an unnamed package (7.4.2) and has package access.
+         * Its direct superclass type is always Object (8.1.4).
+         * It never has any direct superinterface types (8.1.5).
+         */
+
+        check(unnamedClass.isUnnamedClass(), "Unnamed class was isUnnamedClass() false");
+
+        check(!(unnamedClass.isInterface() ||
+                unnamedClass.isEnum()      ||
+                unnamedClass.isRecord()    ||
+                unnamedClass.isHidden()),
+              "Unnamed class was not a normal class");
+
+        check(!(unnamedClass.isLocalClass()  ||
+                unnamedClass.isMemberClass() ||
+                unnamedClass.isPrimitive()   ||
+                unnamedClass.isArray()),
+              "Unnamed class was not top-level");
+
+        check("Unnamed".equals(unnamedClass.getName()),     "Unexpected Class.getName result");
+        check("Unnamed".equals(unnamedClass.getTypeName()), "Unexpected Class.getTypeName result");
+        check("".equals(unnamedClass.getSimpleName()),      "Unexpected Class.getSimpleName result");
+        check(unnamedClass.getCanonicalName() == null,      "Unexpected non-null Class.getCanonicalName");
+
+        int modifiers = unnamedClass.getModifiers();
+        check((modifiers & Modifier.ABSTRACT) == 0,    "Unnamed class was abstract");
+        check((modifiers & Modifier.FINAL) != 0,       "Unnamed class was not final");
+        check((modifiers & (Modifier.PUBLIC  |
+                            Modifier.PRIVATE |
+                            Modifier.PROTECTED)) == 0, "Unnamed class was not package access");
+
+        check(unnamedClass.isSynthetic(), "Unnamed class was not synthetic");
+
+        check("".equals(unnamedClass.getPackage().getName()), "Unnamed class not in an unnamed package");
+
+        check(unnamedClass.getSuperclass() == Object.class, "Superclass was not java.lang.Object");
+
+        check(unnamedClass.getInterfaces().length == 0, "Unnamed class had super interfaces");
+    }
+
+    private static void check(boolean predicate, String message) {
+        if (!predicate) {
+            throw new RuntimeException(message);
+        }
+    }
+}

test/jdk/java/lang/Class/UnnamedClass/Unnamed.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+/**
+ * Exemplar unnamed class.
+ */
+public void main() {
+    System.out.println("Hello, world.");
+}