BAEL-9318 Resolving Current Thread Not Owner Exception (#18601)

* Create ProcessWaitTest.java

* Update ProcessWaitTest.java

Author: dvohra16

core-java-modules/core-java-os-2/src/test/java/com/baeldung/java9/process/ProcessWaitTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.java9.process;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+class ProcessWaitTest {
+
+    @Test
+    void givenAProcess_whenUsingWaitFor_thenNoExceptionThrown() {
+        // Code that interacts with a process should not throw IllegalMonitorStateException.
+        assertDoesNotThrow(() -> {
+            Process process = new ProcessBuilder("notepad.exe").start();
+            int exitCode = process.waitFor();
+        });
+    }
+
+    @Test
+    void givenAProcess_whenUsingWaitWithoutSynchronization_thenExceptionThrown() {
+        assertThrows(IllegalMonitorStateException.class, () -> {
+            Process process = new ProcessBuilder("notepad.exe").start();
+            process.wait();
+        });
+    }
+}