Add simple unit test for ReflectionUnlocker

Author: ctrueden

pom.xml

@@ -100,4 +100,16 @@
 			<optional>true</optional>
 		</dependency>
 	</dependencies>
+
+	<profiles>
+		<profile>
+			<id>jpms</id>
+			<activation>
+				<jdk>[9,)</jdk>
+			</activation>
+			<properties>
+				<scijava.surefire.args>--add-opens=java.base/java.lang=ALL-UNNAMED</scijava.surefire.args>
+			</properties>
+		</profile>
+	</profiles>
 </project>

src/test/java/org/scijava/launcher/ReflectionUnlockerTest.java

@@ -0,0 +1,70 @@
+/*-
+ * #%L
+ * Launcher for SciJava applications.
+ * %%
+ * Copyright (C) 2007 - 2025 SciJava developers.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+
+package org.scijava.launcher;
+
+import org.junit.jupiter.api.Test;
+
+import java.awt.Panel;
+import java.lang.reflect.Field;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+/**
+ * Tests {@link ReflectionUnlocker}.
+ *
+ * @author Curtis Rueden
+ */
+public class ReflectionUnlockerTest {
+
+	private String getPrivateString() throws NoSuchFieldException, IllegalAccessException {
+		Field f = Panel.class.getDeclaredField("base");
+		f.setAccessible(true);
+		return (String) f.get(null);
+	}
+
+	@Test
+	public void testUnlockAll() throws Exception {
+		int majorVersion = Integer.parseInt(System.getProperty("java.version").split("\\.")[0]);
+		if (majorVersion >= 17) {
+			// Check that we are *not* able to instantiate java.awt.Desktop with its private no-args constructor.
+			try {
+				final String value = getPrivateString();
+				fail("Expected exception but got: " + value);
+			}
+			catch (Exception e) { }
+		}
+		ReflectionUnlocker.unlockAll();
+
+		// Now try again.
+		final String value = getPrivateString();
+		assertEquals("panel", value);
+	}
+}