Add unit tests for OpenStack platform defaults

Adds unit tests in platform_test.py to verify OpenStack platform defaults.
Covers cases such as:
- Assigning a default OpenShift-managed load balancer when none is specified
- Handling user-managed load balancers with and without VIPs
- Ensuring correct API and Ingress VIP assignments

pkg/types/openstack/defaults/platform_test.go

@@ -0,0 +1,120 @@
+package defaults
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	configv1 "github.com/openshift/api/config/v1"
+	"github.com/openshift/installer/pkg/ipnet"
+	"github.com/openshift/installer/pkg/types"
+	"github.com/openshift/installer/pkg/types/openstack"
+)
+
+func validPlatform() *openstack.Platform {
+	return &openstack.Platform{
+		Cloud:           "test-cloud",
+		ExternalNetwork: "test-network",
+	}
+}
+
+func validNetworking() *types.Networking {
+	return &types.Networking{
+		NetworkType: "OVNKubernetes",
+		MachineNetwork: []types.MachineNetworkEntry{{
+			CIDR: *ipnet.MustParseCIDR("10.0.0.0/16"),
+		}},
+	}
+}
+
+func TestSetPlatformDefaults(t *testing.T) {
+	cases := []struct {
+		name                string
+		platform            *openstack.Platform
+		config              *types.InstallConfig
+		networking          *types.Networking
+		expectedLB          configv1.PlatformLoadBalancerType
+		expectedAPIVIPs     []string
+		expectedIngressVIPs []string
+	}{
+		{
+			name: "No load balancer provided",
+			platform: func() *openstack.Platform {
+				p := validPlatform()
+				return p
+			}(),
+			networking:          validNetworking(),
+			expectedAPIVIPs:     []string{"10.0.0.5"},
+			expectedIngressVIPs: []string{"10.0.0.7"},
+			expectedLB:          "OpenShiftManagedDefault",
+		},
+		{
+			name: "Default Openshift Managed load balancer VIPs provided",
+			platform: func() *openstack.Platform {
+				p := validPlatform()
+				p.LoadBalancer = &configv1.OpenStackPlatformLoadBalancer{
+					Type: configv1.LoadBalancerTypeOpenShiftManagedDefault,
+				}
+				p.APIVIPs = []string{"10.0.0.2"}
+				p.IngressVIPs = []string{"10.0.0.3"}
+				return p
+			}(),
+			networking:          validNetworking(),
+			expectedAPIVIPs:     []string{"10.0.0.2"},
+			expectedIngressVIPs: []string{"10.0.0.3"},
+			expectedLB:          "OpenShiftManagedDefault",
+		},
+		{
+			name: "Default Openshift Managed load balancer no VIPs provided",
+			platform: func() *openstack.Platform {
+				p := validPlatform()
+				p.LoadBalancer = &configv1.OpenStackPlatformLoadBalancer{
+					Type: configv1.LoadBalancerTypeOpenShiftManagedDefault,
+				}
+				return p
+			}(),
+			networking:          validNetworking(),
+			expectedAPIVIPs:     []string{"10.0.0.5"},
+			expectedIngressVIPs: []string{"10.0.0.7"},
+			expectedLB:          "OpenShiftManagedDefault",
+		},
+		{
+			name: "User managed load balancer VIPs provided",
+			platform: func() *openstack.Platform {
+				p := validPlatform()
+				p.LoadBalancer = &configv1.OpenStackPlatformLoadBalancer{
+					Type: configv1.LoadBalancerTypeUserManaged,
+				}
+				p.APIVIPs = []string{"192.168.100.10"}
+				p.IngressVIPs = []string{"192.168.100.11"}
+				return p
+			}(),
+			networking:          validNetworking(),
+			expectedAPIVIPs:     []string{"192.168.100.10"},
+			expectedIngressVIPs: []string{"192.168.100.11"},
+			expectedLB:          "UserManaged",
+		},
+		{
+			name: "User managed load balancer no VIPs provided",
+			platform: func() *openstack.Platform {
+				p := validPlatform()
+				p.LoadBalancer = &configv1.OpenStackPlatformLoadBalancer{
+					Type: configv1.LoadBalancerTypeUserManaged,
+				}
+				return p
+			}(),
+			networking:          validNetworking(),
+			expectedAPIVIPs:     []string(nil),
+			expectedIngressVIPs: []string(nil),
+			expectedLB:          "UserManaged",
+		},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			SetPlatformDefaults(tc.platform, tc.networking)
+			assert.Equal(t, tc.expectedLB, tc.platform.LoadBalancer.Type, "unexpected loadbalancer")
+			assert.Equal(t, tc.expectedAPIVIPs, tc.platform.APIVIPs, "unexpected APIVIPs")
+			assert.Equal(t, tc.expectedIngressVIPs, tc.platform.IngressVIPs, "unexpected IngressVIPs")
+		})
+	}
+}