test(service): add IPv6 and dual-stack configuration tests

Add helm-unittest tests for IPv6 and dual-stack Service configuration:
- Default behavior (no ipFamilyPolicy/ipFamilies set)
- SingleStack, PreferDualStack, RequireDualStack policies
- IPv4 only, IPv6 only configurations
- Dual-stack with IPv4 primary and IPv6 primary
- Combined policy and families configurations

Add NOTES.txt with IPv6/dual-stack information:
- Display configured IP family policy
- Show IP families list
- Warning when IPv6 is primary (probe compatibility note)
- Warning when IPv6 used without policy

Tests ensure IPv6 and dual-stack work correctly for all scenarios.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

charts/jellyfin/tests/service_ipv6_test.yaml

@@ -0,0 +1,128 @@
+suite: test service ipv6 and dual-stack
+templates:
+  - service.yaml
+tests:
+  - it: should not set ipFamilyPolicy by default
+    asserts:
+      - isNull:
+          path: spec.ipFamilyPolicy
+
+  - it: should not set ipFamilies by default
+    asserts:
+      - isNull:
+          path: spec.ipFamilies
+
+  - it: should set ipFamilyPolicy when specified
+    set:
+      service.ipFamilyPolicy: PreferDualStack
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: PreferDualStack
+
+  - it: should support SingleStack policy
+    set:
+      service.ipFamilyPolicy: SingleStack
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: SingleStack
+
+  - it: should support RequireDualStack policy
+    set:
+      service.ipFamilyPolicy: RequireDualStack
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: RequireDualStack
+
+  - it: should set ipFamilies for IPv4 only
+    set:
+      service.ipFamilies:
+        - IPv4
+    asserts:
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv4
+
+  - it: should set ipFamilies for IPv6 only
+    set:
+      service.ipFamilies:
+        - IPv6
+    asserts:
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv6
+
+  - it: should set ipFamilies for dual-stack IPv4 primary
+    set:
+      service.ipFamilies:
+        - IPv4
+        - IPv6
+    asserts:
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv4
+      - equal:
+          path: spec.ipFamilies[1]
+          value: IPv6
+
+  - it: should set ipFamilies for dual-stack IPv6 primary
+    set:
+      service.ipFamilies:
+        - IPv6
+        - IPv4
+    asserts:
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv6
+      - equal:
+          path: spec.ipFamilies[1]
+          value: IPv4
+
+  - it: should work with PreferDualStack and both families
+    set:
+      service.ipFamilyPolicy: PreferDualStack
+      service.ipFamilies:
+        - IPv4
+        - IPv6
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: PreferDualStack
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv4
+      - equal:
+          path: spec.ipFamilies[1]
+          value: IPv6
+
+  - it: should work with RequireDualStack and both families
+    set:
+      service.ipFamilyPolicy: RequireDualStack
+      service.ipFamilies:
+        - IPv6
+        - IPv4
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: RequireDualStack
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv6
+      - equal:
+          path: spec.ipFamilies[1]
+          value: IPv4
+
+  - it: should work with SingleStack IPv6 only
+    set:
+      service.ipFamilyPolicy: SingleStack
+      service.ipFamilies:
+        - IPv6
+    asserts:
+      - equal:
+          path: spec.ipFamilyPolicy
+          value: SingleStack
+      - equal:
+          path: spec.ipFamilies[0]
+          value: IPv6