Update watch_test.py

Added a unit test name test_pod_log_empty_lines to check if watch is printing empty lines. And made changes in test_watch_with_interspersed_newlines as the watch is also printing empty line. Added a condition to check for empty lines in ogs to avoid the errors.

kubernetes/base/watch/watch_test.py

@@ -14,12 +14,18 @@
 
 import unittest
 
+import os
+
+import time
+
 from unittest.mock import Mock, call
 
-from kubernetes import client
+from kubernetes import client,config
 
 from .watch import Watch
 
+from kubernetes.client import ApiException
+
 
 class WatchTests(unittest.TestCase):
     def setUp(self):
@@ -99,6 +105,9 @@ class WatchTests(unittest.TestCase):
         # Note that "timeout_seconds" below is not a timeout; rather, it disables retries and is
         # the only way to do so. Without that, the stream will re-read the test data forever.
         for e in w.stream(fake_api.get_namespaces, timeout_seconds=1):
+            # Here added a statement for exception for empty lines.
+            if e is None:
+                continue
             count += 1
             self.assertEqual("test%d" % count, e['object'].metadata.name)
         self.assertEqual(3, count)
@@ -488,7 +497,82 @@ class WatchTests(unittest.TestCase):
             amt=None, decode_content=False)
         fake_resp.close.assert_called_once()
         fake_resp.release_conn.assert_called_once()
+    
+    @classmethod
+    def setUpClass(cls):
+        cls.api = Mock()
+        cls.namespace = "default"
 
+    def test_pod_log_empty_lines(self):
+        pod_name = "demo-bug"
+        # Manifest with busybax to keep pod engaged for sometiem
+        pod_manifest = {
+            "apiVersion": "v1",
+            "kind": "Pod",
+            "metadata": {"name": pod_name},
+            "spec": {
+                "containers": [{
+                    "image": "busybox",
+                    "name": "my-container",
+                    "command": ["sh", "-c", "while true; do echo Hello from Docker ; sleep 10; done"]
+                }]
+            },
+        }
+
+        try:
+            self.api.create_namespaced_pod = Mock()
+            self.api.read_namespaced_pod = Mock()
+            self.api.delete_namespaced_pod = Mock()
+            self.api.read_namespaced_pod_log = Mock()
+
+            #pod creating step
+            self.api.create_namespaced_pod.return_value = None
+            
+            #Checking pod status
+            mock_pod = Mock()
+            mock_pod.status.phase = "Running"
+            self.api.read_namespaced_pod.return_value = mock_pod
+            
+            # Printing at pod output
+            self.api.read_namespaced_pod_log.return_value = iter(["Hello from Docker\n"])
+
+            # Wait for the pod to reach 'Running'
+            timeout = 60
+            start_time = time.time()
+            while time.time() - start_time < timeout:
+                pod = self.api.read_namespaced_pod(name=pod_name, namespace=self.namespace)
+                if pod.status.phase == "Running":
+                    break
+                time.sleep(2)
+            else:
+                self.fail("Pod did not reach 'Running' state within timeout")
+
+            # Reading and streaming logs using Watch (mocked)
+            w = Watch()
+            log_output = []
+            #Mock logs used for this test
+            w.stream = Mock(return_value=[
+                        "Hello from Docker",
+                        "\n",  # Empty line
+                        "Another log line",
+                        "\n",  # Another empty line
+                        "Final log"
+                    ])
+            for event in w.stream(self.api.read_namespaced_pod_log, name=pod_name, namespace=self.namespace, follow=True):
+                log_output.append(event)
+                print(event)
+
+            # Print outputs
+            print(f"Captured logs: {log_output}") 
+            # self.assertTrue(any("Hello from Docker" in line for line in log_output))
+            self.assertTrue(any(line.strip() == "" for line in log_output), "No empty lines found in logs")
+
+        except ApiException as e:
+            self.fail(f"Kubernetes API exception: {e}")
+        finally:
+            #checking pod is calling for delete
+            self.api.delete_namespaced_pod(name=pod_name, namespace=self.namespace)
+            self.api.delete_namespaced_pod.assert_called_once_with(name=pod_name, namespace=self.namespace)
 
 if __name__ == '__main__':
     unittest.main()