Reduce size of pgmconfig package

pkg/plugins/config_test.go

@@ -0,0 +1,45 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package plugins
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"sigs.k8s.io/kustomize/v3/pkg/pgmconfig"
+)
+
+func TestConfigDirNoXdg(t *testing.T) {
+	xdg, isSet := os.LookupEnv(pgmconfig.XdgConfigHome)
+	if isSet {
+		os.Unsetenv(pgmconfig.XdgConfigHome)
+	}
+	s := configRoot()
+	if isSet {
+		os.Setenv(pgmconfig.XdgConfigHome, xdg)
+	}
+	if !strings.HasSuffix(
+		s,
+		rootedPath(pgmconfig.DefaultConfigSubdir, pgmconfig.ProgramName)) {
+		t.Fatalf("unexpected config dir: %s", s)
+	}
+}
+
+func rootedPath(elem ...string) string {
+	return string(filepath.Separator) + filepath.Join(elem...)
+}
+
+func TestConfigDirWithXdg(t *testing.T) {
+	xdg, isSet := os.LookupEnv(pgmconfig.XdgConfigHome)
+	os.Setenv(pgmconfig.XdgConfigHome, rootedPath("blah"))
+	s := configRoot()
+	if isSet {
+		os.Setenv(pgmconfig.XdgConfigHome, xdg)
+	}
+	if s != rootedPath("blah", pgmconfig.ProgramName) {
+		t.Fatalf("unexpected config dir: %s", s)
+	}
+}