Add conformance tests for same priority disjoint CNPs

conformance/base/admin_tier/same-priority-1.yaml

@@ -0,0 +1,23 @@
+apiVersion: policy.networking.k8s.io/v1alpha2
+kind: ClusterNetworkPolicy
+metadata:
+  name: same-priority-1
+spec:
+  tier: Admin
+  priority: 15
+  subject:
+    namespaces:
+      matchLabels:
+        kubernetes.io/metadata.name: network-policy-conformance-gryffindor
+  ingress:
+  - name: "allow-from-ravenclaw"
+    action: "Accept"
+    from:
+    - namespaces:
+        matchLabels:
+          kubernetes.io/metadata.name: network-policy-conformance-ravenclaw
+  - name: "deny-all-else"
+    action: "Deny"
+    from:
+    - namespaces:
+        matchLabels: {}

conformance/base/admin_tier/same-priority-2.yaml

@@ -0,0 +1,23 @@
+apiVersion: policy.networking.k8s.io/v1alpha2
+kind: ClusterNetworkPolicy
+metadata:
+  name: same-priority-2
+spec:
+  tier: Admin
+  priority: 15
+  subject:
+    namespaces:
+      matchLabels:
+        kubernetes.io/metadata.name: network-policy-conformance-hufflepuff
+  ingress:
+  - name: "allow-from-slytherin"
+    action: "Accept"
+    from:
+    - namespaces:
+        matchLabels:
+          kubernetes.io/metadata.name: network-policy-conformance-slytherin
+  - name: "deny-all-else"
+    action: "Deny"
+    from:
+    - namespaces:
+        matchLabels: {}

conformance/tests/admin-network-policy-same-priority.go

@@ -0,0 +1,68 @@
+/*
+Copyright 2026 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package tests
+
+import (
+	"testing"
+
+	"sigs.k8s.io/network-policy-api/conformance/utils/kubernetes"
+	"sigs.k8s.io/network-policy-api/conformance/utils/suite"
+)
+
+func init() {
+	ConformanceTests = append(ConformanceTests,
+		CNPAdminTierSamePriority,
+	)
+}
+
+var CNPAdminTierSamePriority = suite.ConformanceTest{
+	ShortName:   "CNPAdminTierSamePriority",
+	Description: "Tests that two disjoint ClusterNetworkPolicies in the Admin tier with the same priority are both applied and work as expected",
+	Features: []suite.SupportedFeature{
+		suite.SupportClusterNetworkPolicy,
+	},
+	Manifests: []string{
+		"base/admin_tier/same-priority-1.yaml",
+		"base/admin_tier/same-priority-2.yaml",
+	},
+	Test: func(t *testing.T, s *suite.ConformanceTestSuite) {
+		// harry-potter-0 is our server pod in gryffindor namespace
+		gryffindorServer := kubernetes.GetPod(t, s.Client, "network-policy-conformance-gryffindor", "harry-potter-0", s.TimeoutConfig.GetTimeout)
+		// cedric-diggory-0 is our server pod in hufflepuff namespace
+		hufflepuffServer := kubernetes.GetPod(t, s.Client, "network-policy-conformance-hufflepuff", "cedric-diggory-0", s.TimeoutConfig.GetTimeout)
+
+		t.Run("Should allow traffic matching same priority disjoint policies", func(t *testing.T) {
+			// Policy 1 (gryffindor) allows ravenclaw
+			kubernetes.PokeServer(t, s.ClientSet, &s.KubeConfig, "network-policy-conformance-ravenclaw", "luna-lovegood-0", "tcp",
+				gryffindorServer.Status.PodIP, int32(80), s.TimeoutConfig, true)
+
+			// Policy 2 (hufflepuff) allows slytherin
+			kubernetes.PokeServer(t, s.ClientSet, &s.KubeConfig, "network-policy-conformance-slytherin", "draco-malfoy-0", "tcp",
+				hufflepuffServer.Status.PodIP, int32(80), s.TimeoutConfig, true)
+		})
+
+		t.Run("Should deny traffic not matching same priority disjoint policies", func(t *testing.T) {
+			// Policy 1 (gryffindor) deny-all-else should block slytherin
+			kubernetes.PokeServer(t, s.ClientSet, &s.KubeConfig, "network-policy-conformance-slytherin", "draco-malfoy-0", "tcp",
+				gryffindorServer.Status.PodIP, int32(80), s.TimeoutConfig, false)
+
+			// Policy 2 (hufflepuff) deny-all-else should block ravenclaw
+			kubernetes.PokeServer(t, s.ClientSet, &s.KubeConfig, "network-policy-conformance-ravenclaw", "luna-lovegood-0", "tcp",
+				hufflepuffServer.Status.PodIP, int32(80), s.TimeoutConfig, false)
+		})
+	},
+}