add kubeconfig tests

pkg/minikube/kubeconfig/config_test.go

+package kubeconfig
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"k8s.io/kubernetes/pkg/client/unversioned/clientcmd/api"
+)
+
+func TestEmptyConfig(t *testing.T) {
+	tmp := tempFile(t, []byte{})
+	defer os.Remove(tmp)
+
+	cfg, err := ReadConfig(tmp)
+	if err != nil {
+		t.Fatalf("could not read config: %v", err)
+	}
+
+	if len(cfg.AuthInfos) != 0 {
+		t.Fail()
+	}
+
+	if len(cfg.Clusters) != 0 {
+		t.Fail()
+	}
+
+	if len(cfg.Contexts) != 0 {
+		t.Fail()
+	}
+}
+
+func TestNewConfig(t *testing.T) {
+	dir, err := ioutil.TempDir("", ".kube")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// setup minikube config
+	expected := api.NewConfig()
+	minikubeConfig(expected)
+
+	// write actual
+	filename := filepath.Join(dir, "config")
+	err = WriteConfig(expected, filename)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	actual, err := ReadConfig(filename)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !configEquals(actual, expected) {
+		t.Fatal("configs did not match")
+	}
+}
+
+// tempFile creates a temporary with the provided bytes as its contents.
+// The caller is responsible for deleting file after use.
+func tempFile(t *testing.T, data []byte) string {
+	tmp, err := ioutil.TempFile("", "kubeconfig")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(data) > 0 {
+		if _, err := tmp.Write(data); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if err := tmp.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	return tmp.Name()
+}
+
+// minikubeConfig returns a config that reasonably approximates a localkube cluster
+func minikubeConfig(config *api.Config) {
+	// cluster
+	clusterName := "minikube"
+	cluster := api.NewCluster()
+	cluster.Server = "https://192.168.99.100:443"
+	cluster.CertificateAuthority = "/home/tux/.minikube/apiserver.crt"
+	config.Clusters[clusterName] = cluster
+
+	// user
+	userName := "minikube"
+	user := api.NewAuthInfo()
+	user.ClientCertificate = "/home/tux/.minikube/apiserver.crt"
+	user.ClientKey = "/home/tux/.minikube/apiserver.key"
+	config.AuthInfos[userName] = user
+
+	// context
+	contextName := "minikube"
+	context := api.NewContext()
+	context.Cluster = clusterName
+	context.AuthInfo = userName
+	config.Contexts[contextName] = context
+
+	config.CurrentContext = contextName
+}
+
+// configEquals checks if configs are identical
+func configEquals(a, b *api.Config) bool {
+	if a.Kind != b.Kind {
+		return false
+	}
+
+	if a.APIVersion != b.APIVersion {
+		return false
+	}
+
+	if a.Preferences.Colors != b.Preferences.Colors {
+		return false
+	}
+	if len(a.Extensions) != len(b.Extensions) {
+		return false
+	}
+
+	// clusters
+	if len(a.Clusters) != len(b.Clusters) {
+		return false
+	}
+	for k, aCluster := range a.Clusters {
+		bCluster, exists := b.Clusters[k]
+		if !exists {
+			return false
+		}
+
+		if aCluster.LocationOfOrigin != bCluster.LocationOfOrigin ||
+			aCluster.Server != bCluster.Server ||
+			aCluster.APIVersion != bCluster.APIVersion ||
+			aCluster.InsecureSkipTLSVerify != bCluster.InsecureSkipTLSVerify ||
+			aCluster.CertificateAuthority != bCluster.CertificateAuthority ||
+			len(aCluster.CertificateAuthorityData) != len(bCluster.CertificateAuthorityData) ||
+			len(aCluster.Extensions) != len(bCluster.Extensions) {
+			return false
+		}
+	}
+
+	// users
+	if len(a.AuthInfos) != len(b.AuthInfos) {
+		return false
+	}
+	for k, aAuth := range a.AuthInfos {
+		bAuth, exists := b.AuthInfos[k]
+		if !exists {
+			return false
+		}
+		if aAuth.LocationOfOrigin != bAuth.LocationOfOrigin ||
+			aAuth.ClientCertificate != bAuth.ClientCertificate ||
+			len(aAuth.ClientCertificateData) != len(bAuth.ClientCertificateData) ||
+			aAuth.ClientKey != bAuth.ClientKey ||
+			len(aAuth.ClientKeyData) != len(bAuth.ClientKeyData) ||
+			aAuth.Token != bAuth.Token ||
+			aAuth.Username != bAuth.Username ||
+			aAuth.Password != bAuth.Password ||
+			len(aAuth.Extensions) != len(bAuth.Extensions) {
+			return false
+		}
+
+	}
+
+	// contexts
+	if len(a.Contexts) != len(b.Contexts) {
+		return false
+	}
+	for k, aContext := range a.Contexts {
+		bContext, exists := b.Contexts[k]
+		if !exists {
+			return false
+		}
+		if aContext.LocationOfOrigin != bContext.LocationOfOrigin ||
+			aContext.Cluster != bContext.Cluster ||
+			aContext.AuthInfo != bContext.AuthInfo ||
+			aContext.Namespace != bContext.Namespace ||
+			len(aContext.Extensions) != len(aContext.Extensions) {
+			return false
+		}
+
+	}
+	return true
+}