Add tests for load balancer function logic

pkg/cluster/k8sres_test.go

+package cluster
+
+import (
+	"github.com/zalando-incubator/postgres-operator/pkg/spec"
+	"github.com/zalando-incubator/postgres-operator/pkg/util/config"
+	"github.com/zalando-incubator/postgres-operator/pkg/util/k8sutil"
+	"testing"
+)
+
+func True() *bool {
+	b := true
+	return &b
+}
+
+func False() *bool {
+	b := false
+	return &b
+}
+
+func TestCreateLoadBalancerLogic(t *testing.T) {
+	var cluster = New(
+		Config{
+			OpConfig: config.Config{
+				ProtectedRoles: []string{"admin"},
+				Auth: config.Auth{
+					SuperUsername:       superUserName,
+					ReplicationUsername: replicationUserName,
+				},
+			},
+		}, k8sutil.KubernetesClient{}, spec.Postgresql{}, logger)
+
+	testName := "TestCreateLoadBalancerLogic"
+	tests := []struct {
+		subtest  string
+		role     PostgresRole
+		spec     *spec.PostgresSpec
+		opConfig config.Config
+		result   bool
+	}{
+		{
+			subtest:  "new format, load balancer is enabled for replica",
+			role:     Replica,
+			spec:     &spec.PostgresSpec{EnableReplicaLoadBalancer: True()},
+			opConfig: config.Config{},
+			result:   true,
+		},
+		{
+			subtest:  "new format, load balancer is disabled for replica",
+			role:     Replica,
+			spec:     &spec.PostgresSpec{EnableReplicaLoadBalancer: False()},
+			opConfig: config.Config{},
+			result:   false,
+		},
+		{
+			subtest:  "new format, load balancer isn't specified for replica",
+			role:     Replica,
+			spec:     &spec.PostgresSpec{EnableReplicaLoadBalancer: nil},
+			opConfig: config.Config{EnableReplicaLoadBalancer: true},
+			result:   true,
+		},
+		{
+			subtest:  "new format, load balancer isn't specified for replica",
+			role:     Replica,
+			spec:     &spec.PostgresSpec{EnableReplicaLoadBalancer: nil},
+			opConfig: config.Config{EnableReplicaLoadBalancer: false},
+			result:   false,
+		},
+		{
+			subtest:  "old format, load balancer is enabled for replica",
+			role:     Replica,
+			spec:     &spec.PostgresSpec{ReplicaLoadBalancer: True()},
+			opConfig: config.Config{},
+			result:   true,
+		},
+		{
+			subtest: "old format has priority",
+			role:    Replica,
+			spec: &spec.PostgresSpec{
+				ReplicaLoadBalancer:       True(),
+				EnableReplicaLoadBalancer: False(),
+			},
+			opConfig: config.Config{},
+			result:   true,
+		},
+	}
+	for _, tt := range tests {
+		cluster.OpConfig = tt.opConfig
+		result := cluster.shouldCreateLoadBalancerForService(tt.role, tt.spec)
+		if tt.result != result {
+			t.Errorf("%s %s: Load balancer is %t, expect %t for role %#v and spec %#v",
+				testName, tt.subtest, result, tt.result, tt.role, tt.spec)
+		}
+	}
+}