add support for kustomize edit set namespace

fixes #246

pkg/commands/setnamespace_test.go

@@ -0,0 +1,103 @@
+/*
+Copyright 2018 The Kubernetes 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 commands
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/kubernetes-sigs/kustomize/pkg/constants"
+	"github.com/kubernetes-sigs/kustomize/pkg/fs"
+)
+
+const (
+	goodNamespaceValue = "staging"
+)
+
+func TestSetNamespaceHappyPath(t *testing.T) {
+	fakeFS := fs.MakeFakeFS()
+	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+
+	cmd := newCmdSetNamespace(fakeFS)
+	args := []string{goodNamespaceValue}
+	err := cmd.RunE(cmd, args)
+	if err != nil {
+		t.Errorf("unexpected cmd error: %v", err)
+	}
+	content, err := fakeFS.ReadFile(constants.KustomizationFileName)
+	if err != nil {
+		t.Errorf("unexpected read error: %v", err)
+	}
+	expected := []byte(fmt.Sprintf("namespace: %s", goodNamespaceValue))
+	if !strings.Contains(string(content), string(expected)) {
+		t.Errorf("expected namespace in kustomization file")
+	}
+}
+
+func TestSetNamespaceOverride(t *testing.T) {
+	fakeFS := fs.MakeFakeFS()
+	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+
+	cmd := newCmdSetNamespace(fakeFS)
+	args := []string{goodNamespaceValue}
+	err := cmd.RunE(cmd, args)
+	if err != nil {
+		t.Errorf("unexpected cmd error: %v", err)
+	}
+	args = []string{"newnamespace"}
+	err = cmd.RunE(cmd, args)
+	if err != nil {
+		t.Errorf("unexpected cmd error: %v", err)
+	}
+	content, err := fakeFS.ReadFile(constants.KustomizationFileName)
+	if err != nil {
+		t.Errorf("unexpected read error: %v", err)
+	}
+	expected := []byte("namespace: newnamespace")
+	if !strings.Contains(string(content), string(expected)) {
+		t.Errorf("expected namespace in kustomization file %s", string(content))
+	}
+}
+
+func TestSetNamespaceNoArgs(t *testing.T) {
+	fakeFS := fs.MakeFakeFS()
+
+	cmd := newCmdSetNamespace(fakeFS)
+	err := cmd.Execute()
+	if err == nil {
+		t.Errorf("expected error: %v", err)
+	}
+	if err.Error() != "must specify exactly one namespace value" {
+		t.Errorf("incorrect error: %v", err.Error())
+	}
+}
+
+func TestSetNamespaceInvalid(t *testing.T) {
+	fakeFS := fs.MakeFakeFS()
+	fakeFS.WriteFile(constants.KustomizationFileName, []byte(kustomizationContent))
+
+	cmd := newCmdSetNamespace(fakeFS)
+	args := []string{"/badnamespace/"}
+	err := cmd.RunE(cmd, args)
+	if err == nil {
+		t.Errorf("expected error: %v", err)
+	}
+	if !strings.Contains(err.Error(), "is not a valid namespace name") {
+		t.Errorf("unexpected error: %v", err.Error())
+	}
+}