Fake Kubernetes context for tests

Fixes GoogleContainerTools#1787

Signed-off-by: David Gageot <[email protected]>

Author: dgageot

pkg/skaffold/build/cache/cache_test.go

@@ -30,6 +30,7 @@ import (
 	"github.com/GoogleContainerTools/skaffold/testutil"
 	"github.com/docker/docker/api/types"
 	yaml "gopkg.in/yaml.v2"
+	"k8s.io/client-go/tools/clientcmd/api"
 )
 
 var (
@@ -122,6 +123,8 @@ func Test_NewCache(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
+			restore := testutil.SetupFakeKubernetesContext(t, api.Config{CurrentContext: "cluster1"})
+			defer restore()
 
 			cacheFile := createTempCacheFile(t, test.cacheFileContents)
 			if test.updateCacheFile {

pkg/skaffold/runner/dev_test.go

@@ -28,6 +28,7 @@ import (
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/sync"
 	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/watch"
 	"github.com/GoogleContainerTools/skaffold/testutil"
+	"k8s.io/client-go/tools/clientcmd/api"
 )
 
 type NoopWatcher struct{}
@@ -92,6 +93,9 @@ func discardOutput() *config.Output {
 }
 
 func TestDevFailFirstCycle(t *testing.T) {
+	restore := testutil.SetupFakeKubernetesContext(t, api.Config{CurrentContext: "cluster1"})
+	defer restore()
+
 	var tests = []struct {
 		description     string
 		testBench       *TestBench
@@ -148,6 +152,9 @@ func TestDevFailFirstCycle(t *testing.T) {
 }
 
 func TestDev(t *testing.T) {
+	restore := testutil.SetupFakeKubernetesContext(t, api.Config{CurrentContext: "cluster1"})
+	defer restore()
+
 	var tests = []struct {
 		description     string
 		testBench       *TestBench
@@ -280,6 +287,9 @@ func TestDev(t *testing.T) {
 }
 
 func TestDevSync(t *testing.T) {
+	restore := testutil.SetupFakeKubernetesContext(t, api.Config{CurrentContext: "cluster1"})
+	defer restore()
+
 	var tests = []struct {
 		description     string
 		testBench       *TestBench

pkg/skaffold/runner/runner_test.go

@@ -290,6 +290,9 @@ func TestNewForConfig(t *testing.T) {
 }
 
 func TestRun(t *testing.T) {
+	restore := testutil.SetupFakeKubernetesContext(t, api.Config{CurrentContext: "cluster1"})
+	defer restore()
+
 	var tests = []struct {
 		description     string
 		testBench       *TestBench