Move kubeconfig loader utils to cmdutil pkg

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

internal/cmdutil/kubeconfigloader_test.go

@@ -0,0 +1,130 @@
+package cmdutil
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/ahmetb/kubectx/internal/kubeconfig"
+	"github.com/ahmetb/kubectx/internal/testutil"
+)
+
+func Test_homeDir(t *testing.T) {
+	type env struct{ k, v string }
+	cases := []struct {
+		name string
+		envs []env
+		want string
+	}{
+		{
+			name: "XDG_CACHE_HOME precedence",
+			envs: []env{
+				{"XDG_CACHE_HOME", "xdg"},
+				{"HOME", "home"},
+			},
+			want: "xdg",
+		},
+		{
+			name: "HOME over USERPROFILE",
+			envs: []env{
+				{"HOME", "home"},
+				{"USERPROFILE", "up"},
+			},
+			want: "home",
+		},
+		{
+			name: "only USERPROFILE available",
+			envs: []env{
+				{"XDG_CACHE_HOME", ""},
+				{"HOME", ""},
+				{"USERPROFILE", "up"},
+			},
+			want: "up",
+		},
+		{
+			name: "none available",
+			envs: []env{
+				{"XDG_CACHE_HOME", ""},
+				{"HOME", ""},
+				{"USERPROFILE", ""},
+			},
+			want: "",
+		},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(tt *testing.T) {
+			var unsets []func()
+			for _, e := range c.envs {
+				unsets = append(unsets, testutil.WithEnvVar(e.k, e.v))
+			}
+
+			got := HomeDir()
+			if got != c.want {
+				t.Errorf("expected:%q got:%q", c.want, got)
+			}
+			for _, u := range unsets {
+				u()
+			}
+		})
+	}
+}
+
+func Test_kubeconfigPath(t *testing.T) {
+	defer testutil.WithEnvVar("HOME", "/x/y/z")()
+
+	expected := filepath.FromSlash("/x/y/z/.kube/config")
+	got, err := kubeconfigPath()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != expected {
+		t.Fatalf("got=%q expected=%q", got, expected)
+	}
+}
+
+func Test_kubeconfigPath_noEnvVars(t *testing.T) {
+	defer testutil.WithEnvVar("XDG_CACHE_HOME", "")()
+	defer testutil.WithEnvVar("HOME", "")()
+	defer testutil.WithEnvVar("USERPROFILE", "")()
+
+	_, err := kubeconfigPath()
+	if err == nil {
+		t.Fatalf("expected error")
+	}
+}
+
+func Test_kubeconfigPath_envOvveride(t *testing.T) {
+	defer testutil.WithEnvVar("KUBECONFIG", "foo")()
+
+	v, err := kubeconfigPath()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if expected := "foo"; v != expected {
+		t.Fatalf("expected=%q, got=%q", expected, v)
+	}
+}
+
+func Test_kubeconfigPath_envOvverideDoesNotSupportPathSeparator(t *testing.T) {
+	path := strings.Join([]string{"file1", "file2"}, string(os.PathListSeparator))
+	defer testutil.WithEnvVar("KUBECONFIG", path)()
+
+	_, err := kubeconfigPath()
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}
+
+func TestStandardKubeconfigLoader_returnsNotFoundErr(t *testing.T) {
+	defer testutil.WithEnvVar("KUBECONFIG", "foo")()
+	kc := new(kubeconfig.Kubeconfig).WithLoader(DefaultLoader)
+	err := kc.Parse()
+	if err == nil {
+		t.Fatal("expected err")
+	}
+	if !IsNotFoundErr(err) {
+		t.Fatalf("expected ENOENT error; got=%v", err)
+	}
+}