Add tests for Kustomize post renderer

Signed-off-by: Hidde Beydals <hello@hidde.co>

internal/runner/post_renderer_kustomize_test.go

@@ -0,0 +1,224 @@
+/*
+Copyright 2021 The Flux 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 runner
+
+import (
+	"bytes"
+	"encoding/json"
+	"reflect"
+	"testing"
+
+	v1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
+	"sigs.k8s.io/yaml"
+
+	"github.com/fluxcd/pkg/apis/kustomize"
+
+	v2 "github.com/fluxcd/helm-controller/api/v2beta1"
+)
+
+const replaceImageMock = `apiVersion: v1
+kind: Pod
+metadata:
+  name: image
+spec:
+  containers:
+  - image: repository/image:tag
+`
+
+const json6902Mock = `apiVersion: v1
+kind: Pod
+metadata:
+  annotations:
+    c: foo
+  name: json6902
+`
+
+const strategicMergeMock = `apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx
+spec:
+  template:
+    spec:
+      containers:
+        - name: nginx
+          image: nignx:v1.0.0
+`
+
+func Test_postRendererKustomize_Run(t *testing.T) {
+	tests := []struct {
+		name                  string
+		renderedManifests     string
+		patchesStrategicMerge string
+		patchesJson6902       string
+		images                string
+		expectManifests       string
+		expectErr             bool
+	}{
+		{
+			name: "image tag",
+			renderedManifests: replaceImageMock,
+			images: `
+- name: repository/image
+  newTag: 0.1.0
+`,
+			expectManifests: `apiVersion: v1
+kind: Pod
+metadata:
+  name: image
+spec:
+  containers:
+  - image: repository/image:0.1.0
+`,
+		},
+		{
+			name: "image name",
+			renderedManifests: replaceImageMock,
+			images: `
+- name: repository/image
+  newName: repository/new-image
+`,
+			expectManifests: `apiVersion: v1
+kind: Pod
+metadata:
+  name: image
+spec:
+  containers:
+  - image: repository/new-image:tag
+`,
+		},
+		{
+			name: "image digest",
+			renderedManifests: replaceImageMock,
+			images: `
+- name: repository/image
+  digest: sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
+`,
+			expectManifests: `apiVersion: v1
+kind: Pod
+metadata:
+  name: image
+spec:
+  containers:
+  - image: repository/image@sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
+`,
+		},
+		{
+			name: "json 6902",
+			renderedManifests: json6902Mock,
+			patchesJson6902: `
+- target:
+    version: v1
+    kind: Pod
+    name: json6902
+  patch:
+    - op: test
+      path: /metadata/annotations/c
+      value: foo
+    - op: remove
+      path: /metadata/annotations/c
+    - op: add
+      path: /metadata/annotations/c
+      value: [ "foo", "bar" ]
+    - op: replace
+      path: /metadata/annotations/c
+      value: 42
+    - op: move
+      from: /metadata/annotations/c
+      path: /metadata/annotations/d
+    - op: copy
+      from: /metadata/annotations/d
+      path: /metadata/annotations/e
+`,
+			expectManifests: `apiVersion: v1
+kind: Pod
+metadata:
+  annotations:
+    d: 42
+    e: 42
+  name: json6902
+`,
+		},
+		{
+			name: "strategic merge test",
+			renderedManifests: strategicMergeMock,
+			patchesStrategicMerge: `
+- apiVersion: apps/v1
+  kind: Deployment
+  metadata:
+    name: nginx
+  spec:
+    template:
+      spec:
+        containers:
+          - name: nginx
+            image: nignx:latest
+`,
+			expectManifests: `apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx
+spec:
+  template:
+    spec:
+      containers:
+      - image: nignx:latest
+        name: nginx
+`,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			spec, err := mockKustomize(tt.patchesStrategicMerge, tt.patchesJson6902, tt.images)
+			k := &postRendererKustomize{
+				spec: spec,
+			}
+			gotModifiedManifests, err := k.Run(bytes.NewBufferString(tt.renderedManifests))
+			if (err != nil) != tt.expectErr {
+				t.Errorf("Run() error = %v, expectErr %v", err, tt.expectErr)
+				return
+			}
+			if !reflect.DeepEqual(gotModifiedManifests, bytes.NewBufferString(tt.expectManifests)) {
+				t.Errorf("Run() gotModifiedManifests = %v, want %v", gotModifiedManifests, tt.expectManifests)
+			}
+		})
+	}
+}
+
+func mockKustomize(patchesStrategicMerge, patchesJson6902, images string) (*v2.Kustomize, error) {
+	b, err := yaml.YAMLToJSON([]byte(patchesStrategicMerge))
+	if err != nil {
+		return nil, err
+	}
+	var strategicMerge []v1.JSON
+	if err := json.Unmarshal(b, &strategicMerge); err != nil {
+		return nil, err
+	}
+	var json6902 []kustomize.JSON6902Patch
+	if err := yaml.Unmarshal([]byte(patchesJson6902), &json6902); err != nil {
+		return nil, err
+	}
+	var imgs []kustomize.Image
+	if err := yaml.Unmarshal([]byte(images), &imgs); err != nil {
+		return nil, err
+	}
+	return &v2.Kustomize{
+		PatchesStrategicMerge: strategicMerge,
+		PatchesJSON6902:       json6902,
+		Images: 			   imgs,
+	}, nil
+}