[tests] one more FileUtil#delete test case

GitOrigin-RevId: 4f7aa49d97d771dbfed4e6cf06aec6edb946a54c

platform/util/testSrc/com/intellij/openapi/util/io/FileUtilHeavyTest.java

@@ -257,6 +257,12 @@ public class FileUtilHeavyTest {
     }
   }
 
+  @Test
+  public void deletingNonExistentFile() throws IOException {
+    File missing = new File(tempDir.getRoot(), "missing");
+    FileUtil.delete(missing.toPath());
+  }
+
   @Test
   public void testToCanonicalPathSymLinksAware() throws IOException {
     IoTestUtil.assumeSymLinkCreationIsSupported();