Add unit tests

Signed-off-by: Israel Blancas <[email protected]>

Author: Israel Blancas

cmd/gather/cluster/cluster_test.go

@@ -0,0 +1,176 @@
+// Copyright The OpenTelemetry 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 cluster
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+	appsv1 "k8s.io/api/apps/v1"
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	"github.com/open-telemetry/opentelemetry-operator/cmd/gather/config"
+)
+
+// MockClient is a mock implementation of client.Client.
+type MockClient struct {
+	mock.Mock
+}
+
+func (m *MockClient) Get(ctx context.Context, key types.NamespacedName, obj client.Object, _ ...client.GetOption) error {
+	args := m.Called(ctx, key, obj)
+	return args.Error(0)
+}
+
+func (m *MockClient) List(ctx context.Context, list client.ObjectList, opts ...client.ListOption) error {
+	args := m.Called(ctx, list, opts)
+	return args.Error(0)
+}
+
+func (m *MockClient) Create(ctx context.Context, obj client.Object, opts ...client.CreateOption) error {
+	args := m.Called(ctx, obj, opts)
+	return args.Error(0)
+}
+
+func (m *MockClient) Delete(ctx context.Context, obj client.Object, opts ...client.DeleteOption) error {
+	args := m.Called(ctx, obj, opts)
+	return args.Error(0)
+}
+
+func (m *MockClient) Update(ctx context.Context, obj client.Object, opts ...client.UpdateOption) error {
+	args := m.Called(ctx, obj, opts)
+	return args.Error(0)
+}
+
+func (m *MockClient) Patch(ctx context.Context, obj client.Object, patch client.Patch, opts ...client.PatchOption) error {
+	args := m.Called(ctx, obj, patch, opts)
+	return args.Error(0)
+}
+
+func (m *MockClient) DeleteAllOf(ctx context.Context, obj client.Object, opts ...client.DeleteAllOfOption) error {
+	args := m.Called(ctx, obj, opts)
+	return args.Error(0)
+}
+
+func (m *MockClient) Status() client.StatusWriter {
+	args := m.Called()
+	return args.Get(0).(client.StatusWriter)
+}
+
+func (m *MockClient) Scheme() *runtime.Scheme {
+	args := m.Called()
+	return args.Get(0).(*runtime.Scheme)
+}
+
+func (m *MockClient) RESTMapper() meta.RESTMapper {
+	args := m.Called()
+	return args.Get(0).(meta.RESTMapper)
+}
+
+func (m *MockClient) GroupVersionKindFor(obj runtime.Object) (schema.GroupVersionKind, error) {
+	return schema.GroupVersionKind{}, nil
+}
+
+func (m *MockClient) IsObjectNamespaced(_ runtime.Object) (bool, error) {
+	return true, nil
+}
+
+func (m *MockClient) SubResource(string) client.SubResourceClient {
+	return nil
+}
+
+func TestGetOperatorNamespace(t *testing.T) {
+	mockClient := new(MockClient)
+	cfg := &config.Config{
+		KubernetesClient: mockClient,
+	}
+	cluster := NewCluster(cfg)
+
+	// Test when OperatorNamespace is already set
+	cfg.OperatorNamespace = "test-namespace"
+	ns, err := cluster.getOperatorNamespace()
+	assert.NoError(t, err)
+	assert.Equal(t, "test-namespace", ns)
+
+	// Test when OperatorNamespace is not set
+	cfg.OperatorNamespace = ""
+	mockClient.On("List", mock.Anything, &appsv1.DeploymentList{}, mock.Anything).Return(nil).Run(func(args mock.Arguments) {
+		arg := args.Get(1).(*appsv1.DeploymentList)
+		arg.Items = []appsv1.Deployment{
+			{
+				ObjectMeta: metav1.ObjectMeta{
+					Namespace: "operator-namespace",
+				},
+			},
+		}
+	})
+
+	ns, err = cluster.getOperatorNamespace()
+	assert.NoError(t, err)
+	assert.Equal(t, "operator-namespace", ns)
+	mockClient.AssertExpectations(t)
+}
+
+func TestGetOperatorDeployment(t *testing.T) {
+
+	mockClient := new(MockClient)
+	cfg := &config.Config{
+		KubernetesClient: mockClient,
+	}
+	cluster := NewCluster(cfg)
+	// Test successful case
+	mockClient.On("List", mock.Anything, &appsv1.DeploymentList{}, mock.Anything).Return(nil).Run(func(args mock.Arguments) {
+		arg := args.Get(1).(*appsv1.DeploymentList)
+		arg.Items = []appsv1.Deployment{
+			{
+				ObjectMeta: metav1.ObjectMeta{
+					Name: "opentelemetry-operator",
+				},
+			},
+		}
+	})
+
+	deployment, err := cluster.getOperatorDeployment()
+	assert.NoError(t, err)
+	assert.Equal(t, "opentelemetry-operator", deployment.Name)
+
+	mockClient.AssertExpectations(t)
+}
+
+func TestGetOperatorDeploymentNotFound(t *testing.T) {
+
+	mockClient := new(MockClient)
+	cfg := &config.Config{
+		KubernetesClient: mockClient,
+	}
+	cluster := NewCluster(cfg)
+
+	// Test when no operator is found
+	mockClient.On("List", mock.Anything, &appsv1.DeploymentList{}, mock.Anything).Return(nil).Run(func(args mock.Arguments) {
+		arg := args.Get(1).(*appsv1.DeploymentList)
+		arg.Items = []appsv1.Deployment{}
+	})
+
+	_, err := cluster.getOperatorDeployment()
+	assert.Error(t, err)
+	assert.Equal(t, "operator not found", err.Error())
+}