tests: add test case to repro #3022 with Jobs and unreachable clusters

tests/sdk/java/testdata/job-unreachable/Pulumi.yaml

@@ -0,0 +1,32 @@
+name: job-unreachable
+runtime: yaml
+resources:
+  provider:
+    type: pulumi:providers:kubernetes
+  job:
+    type: kubernetes:batch/v1:Job
+    properties:
+      metadata:
+        name: test-job-unreachable
+        annotations:
+          pulumi.com/replaceUnready: "true"
+      spec:
+        template:
+          metadata:
+            name: test-job-unreachable
+          spec:
+            containers:
+              - name: test-job-unreachable-container
+                image: busybox
+                # This command will cause the container to exit with a non-zero status code, and fail the job.
+                command:
+                  - sh
+                  - -c
+                  - exit 1
+            restartPolicy: Never
+    options:
+      provider: ${provider}
+      customTimeouts:
+        create: 15s
+        update: 15s
+        delete: 15s

tests/sdk/java/testdata/job-unreachable/step2/Pulumi.yaml

@@ -0,0 +1,34 @@
+name: job-unreachable
+runtime: yaml
+resources:
+  provider:
+    type: pulumi:providers:kubernetes
+    properties:
+      kubeconfig: "fake-kubeconfig-data"
+  job:
+    type: kubernetes:batch/v1:Job
+    properties:
+      metadata:
+        name: test-job-unreachable
+        annotations:
+          pulumi.com/replaceUnready: "true"
+      spec:
+        template:
+          metadata:
+            name: test-job-unreachable
+          spec:
+            containers:
+              - name: test-job-unreachable-container
+                image: busybox
+                # This command will cause the container to exit with a non-zero status code, and fail the job.
+                command:
+                  - sh
+                  - -c
+                  - exit 1
+            restartPolicy: Never
+    options:
+      provider: ${provider}
+      customTimeouts:
+        create: 15s
+        update: 15s
+        delete: 15s

tests/sdk/java/yamlv2_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/pulumi/providertest/pulumitest"
+	"github.com/stretchr/testify/assert"
 )
 
 // TestYamlV2 deploys a complex stack using yaml/v2 package.
@@ -21,3 +22,23 @@ func TestYamlV2(t *testing.T) {
 	test.Preview()
 	test.Up()
 }
+
+// TestJobUnreachable ensures that a panic does not occur when diffing Job resources against an unreachable API server.
+// https://github.com/pulumi/pulumi-kubernetes/issues/3022
+func TestJobUnreachable(t *testing.T) {
+	test := pulumitest.NewPulumiTest(t, "testdata/job-unreachable")
+	t.Logf("into %s", test.Source())
+	t.Cleanup(func() {
+		test.Destroy()
+	})
+	test.Preview()
+
+	// Create the job, but expect it to fail as the job is meant to fail.
+	_, err := test.CurrentStack().Up(test.Context())
+	assert.ErrorContains(t, err, `but the Kubernetes API server reported that it failed to fully initialize or become live`)
+
+	// Re-run the Pulumi program with a malformed kubeconfig to simulate an unreachable API server.
+	// This should not panic annd preview should succeed.
+	test.UpdateSource("testdata/job-unreachable/step2")
+	test.Preview()
+}