Add unittest for pkg/limayaml/default.yaml

examples/default.yaml

@@ -125,7 +125,7 @@ ssh:
   # 🟢 Builtin default: 0 (automatically assigned to a free port)
   # NOTE: when the instance name is "default", the builtin default value is set to
   # 60022 for backward compatibility.
-  localPort: 0
+  localPort: null
   # Load ~/.ssh/*.pub in addition to $LIMA_HOME/_config/user.pub .
   # This option is useful when you want to use other SSH-based
   # applications such as rsync with the Lima instance.

pkg/limayaml/limayaml.go

@@ -72,8 +72,8 @@ const (
 )
 
 type Rosetta struct {
-	Enabled *bool `yaml:"enabled" json:"enabled"`
-	BinFmt  *bool `yaml:"binfmt" json:"binfmt"`
+	Enabled *bool `yaml:"enabled,omitempty" json:"enabled,omitempty"`
+	BinFmt  *bool `yaml:"binfmt,omitempty" json:"binfmt,omitempty"`
 }
 
 type File struct {

pkg/limayaml/limayaml_test.go

@@ -0,0 +1,43 @@
+package limayaml
+
+import (
+	"encoding/json"
+	"os"
+	"testing"
+
+	"gotest.tools/v3/assert"
+)
+
+func dumpJSON(t *testing.T, d interface{}) string {
+	b, err := json.Marshal(d)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return string(b)
+}
+
+const emptyYAML = "images: []\n"
+
+func TestEmptyYAML(t *testing.T) {
+	var y LimaYAML
+	t.Log(dumpJSON(t, y))
+	b, err := marshalYAML(y)
+	assert.NilError(t, err)
+	assert.Equal(t, string(b), emptyYAML)
+}
+
+const defaultYAML = "images: []\n"
+
+func TestDefaultYAML(t *testing.T) {
+	bytes, err := os.ReadFile("default.yaml")
+	assert.NilError(t, err)
+	var y LimaYAML
+	err = unmarshalYAML(bytes, &y, "")
+	assert.NilError(t, err)
+	y.Images = nil // remove default images
+	y.Mounts = nil // remove default mounts
+	t.Log(dumpJSON(t, y))
+	b, err := marshalYAML(y)
+	assert.NilError(t, err)
+	assert.Equal(t, string(b), defaultYAML)
+}