Add PathUtilsTest.testSetReadOnlyFileAbsent()

Author: garydgregory

src/test/java/org/apache/commons/io/file/PathUtilsTest.java

@@ -540,6 +540,11 @@ public void testSetReadOnlyFile() throws IOException {
         PathUtils.deleteFile(resolved);
     }
 
+    @Test
+    public void testSetReadOnlyFileAbsent() {
+        assertThrows(IOException.class, () -> PathUtils.setReadOnly(Paths.get("does-not-exist-at-all-ever-never"), true));
+    }
+
     @Test
     public void testTouch() throws IOException {
         assertThrows(NullPointerException.class, () -> FileUtils.touch(null));