Add diffing to tests.

kustomize/go.mod

@@ -3,6 +3,7 @@ module sigs.k8s.io/kustomize/kustomize/v3
 go 1.14
 
 require (
+	github.com/google/go-cmp v0.3.0
 	github.com/pkg/errors v0.9.1
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/pflag v1.0.5

kustomize/go.sum

@@ -239,6 +239,7 @@ github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.5.1 h1:JFrFEBb2xKufg6XkJsJr+WbKb4FQlURi5RUcBveYu9k=
 github.com/google/gofuzz v0.0.0-20161122191042-44d81051d367/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=
 github.com/google/gofuzz v1.0.0 h1:A8PeW59pxE9IoFRqBp37U+mSNaQoZ46F1f0f863XSXw=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
@@ -756,6 +757,7 @@ sigs.k8s.io/kustomize/kyaml v0.1.4/go.mod h1:461i94nj0h0ylJ6w83jLkR4SqqVhn1iY6fj
 sigs.k8s.io/kustomize/kyaml v0.2.0/go.mod h1:72/rLkSi+L/pHM1oCjwrf3ClU+tH5kZQvvdLSqIHwWU=
 sigs.k8s.io/kustomize/kyaml v0.4.1 h1:NEqA/35upoAjb+I5vh1ODUqxoX4DOrezeQa9BhhG5Co=
 sigs.k8s.io/kustomize/kyaml v0.4.1/go.mod h1:XJL84E6sOFeNrQ7CADiemc1B0EjIxHo3OhW4o1aJYNw=
+sigs.k8s.io/kustomize/kyaml v0.4.2/go.mod h1:XJL84E6sOFeNrQ7CADiemc1B0EjIxHo3OhW4o1aJYNw=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
 sigs.k8s.io/structured-merge-diff v1.0.1-0.20191108220359-b1b620dd3f06/go.mod h1:/ULNhyfzRopfcjskuui0cTITekDduZ7ycKN3oUT9R18=

kustomize/internal/commands/kustfile/kustomizationfile_test.go

@@ -8,6 +8,8 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/google/go-cmp/cmp"
+
 	"sigs.k8s.io/kustomize/api/filesys"
 	"sigs.k8s.io/kustomize/api/konfig"
 	"sigs.k8s.io/kustomize/api/types"
@@ -27,6 +29,7 @@ func TestFieldOrder(t *testing.T) {
 		"CommonLabels",
 		"CommonAnnotations",
 		"PatchesStrategicMerge",
+		"PatchesJson6902",
 		"Patches",
 		"ConfigMapGenerator",
 		"SecretGenerator",
@@ -157,8 +160,8 @@ patchesStrategicMerge:
 	}
 	bytes, _ := fSys.ReadFile(mf.path)
 
-	if !reflect.DeepEqual(kustomizationContentWithComments, bytes) {
-		t.Fatal("written kustomization with comments is not the same as original one")
+	if diff := cmp.Diff(kustomizationContentWithComments, bytes); diff != "" {
+		t.Errorf("Mismatch (-expected, +actual):\n%s", diff)
 	}
 }
 
@@ -251,10 +254,8 @@ generatorOptions:
 	}
 	bytes, _ := fSys.ReadFile(mf.path)
 
-	if string(expected) != string(bytes) {
-		t.Fatalf(
-			"expected =\n%s\n\nactual =\n%s\n",
-			string(expected), string(bytes))
+	if diff := cmp.Diff(expected, bytes); diff != "" {
+		t.Errorf("Mismatch (-expected, +actual):\n%s", diff)
 	}
 }
 
@@ -289,10 +290,8 @@ kind: Kustomization
 	}
 	bytes, _ := fSys.ReadFile(mf.path)
 
-	if string(expected) != string(bytes) {
-		t.Fatalf(
-			"expected =\n%s\n\nactual =\n%s\n",
-			string(expected), string(bytes))
+	if diff := cmp.Diff(expected, bytes); diff != "" {
+		t.Errorf("Mismatch (-expected, +actual):\n%s", diff)
 	}
 }
 
@@ -334,36 +333,37 @@ kind: Kustomization
 	}
 	bytes, _ := fSys.ReadFile(mf.path)
 
-	if string(expected) != string(bytes) {
-		t.Fatalf(
-			"expected =\n%s\n\nactual =\n%s\n",
-			string(expected), string(bytes))
+	if diff := cmp.Diff(expected, bytes); diff != "" {
+		t.Errorf("Mismatch (-expected, +actual):\n%s", diff)
 	}
 }
 
-func TestFixOutdatedPatchesFieldTitle(t *testing.T) {
+func TestRenameAndKeepOutdatedPatchesField(t *testing.T) {
 	kustomizationContentWithOutdatedPatchesFieldTitle := []byte(`
 patchesJson6902:
 - path: patch1.yaml
   target:
-    kind: Service
+    kind: Deployment
+patches:
 - path: patch2.yaml
   target:
-    group: apps
     kind: Deployment
-    version: v1
+- path: patch3.yaml
+  target:
+    kind: Service
 `)
 
 	expected := []byte(`
 patches:
-- path: patch1.yaml
-  target:
-    kind: Service
 - path: patch2.yaml
   target:
-    group: apps
     kind: Deployment
-    version: v1
+- path: patch3.yaml
+  target:
+    kind: Service
+- path: patch1.yaml
+  target:
+    kind: Deployment
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 `)
@@ -383,10 +383,55 @@ kind: Kustomization
 	}
 	bytes, _ := fSys.ReadFile(mf.path)
 
-	if string(expected) != string(bytes) {
-		t.Fatalf(
-			"expected =\n%s\n\nactual =\n%s\n",
-			string(expected), string(bytes))
+	if diff := cmp.Diff(expected, bytes); diff != "" {
+		t.Errorf("Mismatch (-expected, +actual):\n%s", diff)
+	}
+}
+
+func TestFixOutdatedPatchesFieldTitle(t *testing.T) {
+	kustomizationContentWithOutdatedPatchesFieldTitle := []byte(`
+patchesJson6902:
+- path: patch1.yaml
+  target:
+    kind: Service
+- path: patch2.yaml
+  target:
+    group: apps
+    kind: Deployment
+    version: v1
+`)
+
+	expected := []byte(`
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+patches:
+- path: patch1.yaml
+  target:
+    kind: Service
+- path: patch2.yaml
+  target:
+    group: apps
+    kind: Deployment
+    version: v1
+`)
+	fSys := filesys.MakeFsInMemory()
+	testutils_test.WriteTestKustomizationWith(fSys, kustomizationContentWithOutdatedPatchesFieldTitle)
+	mf, err := NewKustomizationFile(fSys)
+	if err != nil {
+		t.Fatalf("Unexpected Error: %v", err)
+	}
+
+	kustomization, err := mf.Read()
+	if err != nil {
+		t.Fatalf("Unexpected Error: %v", err)
+	}
+	if err = mf.Write(kustomization); err != nil {
+		t.Fatalf("Unexpected Error: %v", err)
+	}
+	bytes, _ := fSys.ReadFile(mf.path)
+
+	if diff := cmp.Diff(expected, bytes); diff != "" {
+		t.Errorf("Mismatch (-expected, +actual):\n%s", diff)
 	}
 }