bgeng777 commented on a change in pull request #131:
URL: 
https://github.com/apache/flink-kubernetes-operator/pull/131#discussion_r840323394



##########
File path: 
flink-kubernetes-operator/src/test/java/org/apache/flink/kubernetes/operator/controller/FlinkDeploymentControllerTest.java
##########
@@ -397,7 +402,59 @@ public void testUpgradeNotReadyCluster() {
         testUpgradeNotReadyCluster(appCluster, false);
     }
 
-    public void testUpgradeNotReadyCluster(FlinkDeployment appCluster, boolean 
allowUpgrade) {
+    @Test
+    public void verifyReconcileWithBadConfig() {
+
+        FlinkDeployment appCluster = TestUtils.buildApplicationCluster();
+        UpdateControl<FlinkDeployment> updateControl;
+        // Override rest port, and it should be saved in lastReconciledSpec 
once a successful
+        // reconcile() finishes.
+        
appCluster.getSpec().getFlinkConfiguration().put(RestOptions.PORT.key(), 
"8088");
+        updateControl = testController.reconcile(appCluster, context);
+        assertTrue(updateControl.isUpdateStatus());
+        assertEquals(
+                JobManagerDeploymentStatus.DEPLOYING,
+                appCluster.getStatus().getJobManagerDeploymentStatus());
+
+        // Check when the bad config is applied, observe() will change the 
cluster state correctly
+        appCluster.getSpec().getJobManager().setReplicas(-1);
+        // Next reconcile will set error msg and observe with previous 
validated config
+        updateControl = testController.reconcile(appCluster, context);
+        assertEquals(
+                "JobManager replicas should not be configured less than one.",
+                appCluster.getStatus().getReconciliationStatus().getError());
+        assertTrue(updateControl.isUpdateStatus());
+        assertEquals(
+                JobManagerDeploymentStatus.DEPLOYED_NOT_READY,
+                appCluster.getStatus().getJobManagerDeploymentStatus());
+
+        // Check the exception
+        appCluster.getSpec().getJobManager().setReplicas(1);
+        appCluster.getSpec().getJob().setJarURI(null);
+        assertDoesNotThrow(

Review comment:
       It is for @gyfora's latest 
[comment](https://github.com/apache/flink-kubernetes-operator/pull/131#discussion_r839643933)
 to make sure  we first do validation and then get the effective config.




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