Improve command package isolation.

pkg/commands/edit/set/set_name_prefix_test.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2017 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 set
+
+import (
+	"strings"
+	"testing"
+
+	"sigs.k8s.io/kustomize/pkg/constants"
+	"sigs.k8s.io/kustomize/pkg/fs"
+)
+
+const (
+	goodPrefixValue = "acme-"
+)
+
+func TestSetNamePrefixHappyPath(t *testing.T) {
+	fakeFS := fs.MakeFakeFS()
+	fakeFS.WriteTestKustomization()
+
+	cmd := newCmdSetNamePrefix(fakeFS)
+	args := []string{goodPrefixValue}
+	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)
+	}
+	if !strings.Contains(string(content), goodPrefixValue) {
+		t.Errorf("expected prefix value in kustomization file")
+	}
+}
+
+func TestSetNamePrefixNoArgs(t *testing.T) {
+	fakeFS := fs.MakeFakeFS()
+
+	cmd := newCmdSetNamePrefix(fakeFS)
+	err := cmd.Execute()
+	if err == nil {
+		t.Errorf("expected error: %v", err)
+	}
+	if err.Error() != "must specify exactly one prefix value" {
+		t.Errorf("incorrect error: %v", err.Error())
+	}
+}