test: added tests for the PVC analyzer (#1000)

This commit introduces comprehensive tests for the
`PersistentVolumeClaim` analyzer defined in the `pkg/analyzer` package.

Adding these tests increases the code coverage of the `pvc.go` file to
>95%.

I also made minor modifications to the ReplicaSet test to ensure all
expectations were met.

Partially addresses: #889

Signed-off-by: VaibhavMalik4187 <vaibhavmalik2018@gmail.com>

pkg/analyzer/pvc.go

@@ -18,6 +18,7 @@ import (
 
 	"github.com/k8sgpt-ai/k8sgpt/pkg/common"
 	"github.com/k8sgpt-ai/k8sgpt/pkg/util"
+	appsv1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
@@ -43,7 +44,7 @@ func (PvcAnalyzer) Analyze(a common.Analyzer) ([]common.Result, error) {
 		var failures []common.Failure
 
 		// Check for empty rs
-		if pvc.Status.Phase == "Pending" {
+		if pvc.Status.Phase == appsv1.ClaimPending {
 
 			// parse the event log and append details
 			evt, err := FetchLatestEvent(a.Context, a.Client, pvc.Namespace, pvc.Name)

pkg/analyzer/pvc_test.go

@@ -0,0 +1,217 @@
+/*
+Copyright 2024 The K8sGPT 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 analyzer
+
+import (
+	"context"
+	"testing"
+
+	"github.com/k8sgpt-ai/k8sgpt/pkg/common"
+	"github.com/k8sgpt-ai/k8sgpt/pkg/kubernetes"
+	"github.com/stretchr/testify/require"
+	appsv1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes/fake"
+)
+
+func TestPersistentVolumeClaimAnalyzer(t *testing.T) {
+	tests := []struct {
+		name         string
+		config       common.Analyzer
+		expectations []string
+	}{
+		{
+			name: "PV1 and PVC5 report failures",
+			config: common.Analyzer{
+				Client: &kubernetes.Client{
+					Client: fake.NewSimpleClientset(
+						&appsv1.Event{
+							// This is the latest event.
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "Event1",
+								Namespace: "default",
+							},
+							Reason:  "ProvisioningFailed",
+							Message: "PVC provisioning failed",
+						},
+						&appsv1.Event{
+							ObjectMeta: metav1.ObjectMeta{
+								// This event won't get selected.
+								Name:      "Event2",
+								Namespace: "test",
+							},
+						},
+						&appsv1.Event{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "Event3",
+								Namespace: "default",
+							},
+						},
+						&appsv1.PersistentVolumeClaim{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "PVC1",
+								Namespace: "default",
+							},
+							Status: appsv1.PersistentVolumeClaimStatus{
+								Phase: appsv1.ClaimPending,
+							},
+						},
+						&appsv1.PersistentVolumeClaim{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "PVC2",
+								Namespace: "default",
+							},
+							Status: appsv1.PersistentVolumeClaimStatus{
+								// Won't contribute to failures.
+								Phase: appsv1.ClaimBound,
+							},
+						},
+						&appsv1.PersistentVolumeClaim{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "PVC3",
+								Namespace: "default",
+							},
+							Status: appsv1.PersistentVolumeClaimStatus{
+								// Won't contribute to failures.
+								Phase: appsv1.ClaimLost,
+							},
+						},
+						&appsv1.PersistentVolumeClaim{
+							// PVCs in namespace other than "default" won't be discovered.
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "PVC4",
+								Namespace: "test",
+							},
+							Status: appsv1.PersistentVolumeClaimStatus{
+								Phase: appsv1.ClaimLost,
+							},
+						},
+						&appsv1.PersistentVolumeClaim{
+							// PVCs in namespace other than "default" won't be discovered.
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "PVC5",
+								Namespace: "default",
+							},
+							Status: appsv1.PersistentVolumeClaimStatus{
+								Phase: appsv1.ClaimPending,
+							},
+						},
+					),
+				},
+				Context:   context.Background(),
+				Namespace: "default",
+			},
+			expectations: []string{
+				"default/PVC1",
+				"default/PVC5",
+			},
+		},
+		{
+			name: "no event",
+			config: common.Analyzer{
+				Client: &kubernetes.Client{
+					Client: fake.NewSimpleClientset(
+						&appsv1.PersistentVolumeClaim{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "PVC1",
+								Namespace: "default",
+							},
+							Status: appsv1.PersistentVolumeClaimStatus{
+								Phase: appsv1.ClaimPending,
+							},
+						},
+					),
+				},
+				Context:   context.Background(),
+				Namespace: "default",
+			},
+		},
+		{
+			name: "event other than privision failure",
+			config: common.Analyzer{
+				Client: &kubernetes.Client{
+					Client: fake.NewSimpleClientset(
+						&appsv1.Event{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "Event1",
+								Namespace: "default",
+							},
+							// Any reason other than ProvisioningFailed won't result in failure.
+							Reason: "UnknownReason",
+						},
+						&appsv1.PersistentVolumeClaim{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "PVC1",
+								Namespace: "default",
+							},
+							Status: appsv1.PersistentVolumeClaimStatus{
+								Phase: appsv1.ClaimPending,
+							},
+						},
+					),
+				},
+				Context:   context.Background(),
+				Namespace: "default",
+			},
+		},
+		{
+			name: "event without error message",
+			config: common.Analyzer{
+				Client: &kubernetes.Client{
+					Client: fake.NewSimpleClientset(
+						&appsv1.Event{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "Event1",
+								Namespace: "default",
+							},
+							// Event without any error message won't result in failure.
+							Reason: "ProvisioningFailed",
+						},
+						&appsv1.PersistentVolumeClaim{
+							ObjectMeta: metav1.ObjectMeta{
+								Name:      "PVC1",
+								Namespace: "default",
+							},
+							Status: appsv1.PersistentVolumeClaimStatus{
+								Phase: appsv1.ClaimPending,
+							},
+						},
+					),
+				},
+				Context:   context.Background(),
+				Namespace: "default",
+			},
+		},
+	}
+
+	pvcAnalyzer := PvcAnalyzer{}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results, err := pvcAnalyzer.Analyze(tt.config)
+			require.NoError(t, err)
+
+			if tt.expectations == nil {
+				require.Equal(t, 0, len(results))
+			} else {
+				for i, expectation := range tt.expectations {
+					require.Equal(t, expectation, results[i].Name)
+					for _, failure := range results[i].Error {
+						require.Equal(t, "PVC provisioning failed", failure.Text)
+					}
+				}
+			}
+		})
+	}
+}

pkg/analyzer/rs_test.go

@@ -142,10 +142,10 @@ func TestReplicaSetAnalyzer(t *testing.T) {
 		},
 	}
 
-	for i, result := range results {
-		require.Equal(t, expectations[i].name, result.Name)
-		for j, failure := range result.Error {
-			require.Equal(t, expectations[i].failuresText[j], failure.Text)
+	for i, expectation := range expectations {
+		require.Equal(t, expectation.name, results[i].Name)
+		for j, failure := range results[i].Error {
+			require.Equal(t, expectation.failuresText[j], failure.Text)
 		}
 	}
 }