walkinggo commented on code in PR #23811:
URL: https://github.com/apache/pulsar/pull/23811#discussion_r1907287557


##########
pulsar-functions/instance/src/test/java/org/apache/pulsar/functions/instance/JavaInstanceTest.java:
##########
@@ -309,4 +317,25 @@ public void testAsyncFunctionMaxPendingVoidResult() throws 
Exception {
         log.info("start:{} end:{} during:{}", startTime, endTime, endTime - 
startTime);
         instance.close();
     }
+
+    @Test
+    public void testAsyncFunctionTime() {
+        JavaInstance instance = new JavaInstance(
+                mock(ContextImpl.class),
+                (Function<String, String>) (input, context) -> {
+                    try {
+                        Thread.sleep(500);
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                    }
+                    return input;
+                },
+                new InstanceConfig());
+        String testString = "ABC123";
+        JavaExecutionResult result = 
instance.handleMessage(mock(Record.class), testString);
+        assertNotNull(result.getResult());
+        long beforeTime = System.nanoTime() - 500_000_000L;
+        assertTrue(Math.abs(beforeTime - result.getStartTime()) <= 20_000_000);

Review Comment:
   Is this test program only runnable on Linux or macOS? I ran it on Windows 
using the command you provided, but encountered an error indicating that I 
don't have permission to delete certain files and that the path characters are 
incorrect.



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