Add new tests to verify behavior of the new byo DNS feature

Currently feature is in Tech preview

Author: sadasu

config/v1/techpreview.infrastructure.testsuite.yaml

@@ -211,3 +211,132 @@ tests:
               type: FooBar
           type: BareMetal
     expectedStatusError: "status.platformStatus.baremetal.loadBalancer.type: Unsupported value: \"FooBar\": supported values: \"OpenShiftManagedDefault\", \"UserManaged\""
+  - name: Should set dnsConfig provider to "" if not specified
+    initial: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+    updated: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+      status:
+        platform: AWS
+        platformStatus:
+          aws: {}
+          type: AWS
+    expected: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+      status:
+        controlPlaneTopology: HighlyAvailable
+        cpuPartitioning: None
+        infrastructureTopology: HighlyAvailable
+        platform: AWS
+        platformStatus:
+          aws:
+            dnsConfig:
+              provider: ""
+          type: AWS
+  - name: Should be able to override the default Provider with a valid value
+    initial: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+    updated: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+      status:
+        platform: AWS
+        platformStatus:
+          aws:
+            dnsConfig:
+              provider: UserAndClusterProvided
+          type: AWS
+    expected: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+      status:
+        controlPlaneTopology: HighlyAvailable
+        cpuPartitioning: None
+        infrastructureTopology: HighlyAvailable
+        platform: AWS
+        platformStatus:
+          aws:
+            dnsConfig:
+              provider: UserAndClusterProvided
+          type: AWS
+  - name: Should be not be able to modify immutable 'provider'
+    initial: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+      status:
+        platform: AWS
+        platformStatus:
+          aws:
+            dnsConfig:
+              provider: CloudProvided
+          type: AWS
+    updated: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+      status:
+        platform: AWS
+        platformStatus:
+          aws:
+            dnsConfig:
+              provider: ""
+          type: AWS
+    expectedStatusError: "status.platformStatus.aws.dnsConfig.provider: Invalid value: \"string\": provider is immutable once set"
+  - name: Should be not be able to set Provider with an invalid value
+    initial: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+    updated: |
+      apiVersion: config.openshift.io/v1
+      kind: Infrastructure
+      spec:
+        platformSpec:
+          aws: {}
+          type: AWS
+      status:
+        platform: AWS
+        platformStatus:
+          aws:
+            dnsConfig:
+              provider: CloudProvided
+          type: AWS
+    expectedStatusError: "status.platformStatus.aws.dnsConfig.provider: Unsupported value: \"CloudProvided\": supported values: \"UserAndClusterProvided\", \"\""