feat: firecracker best path

internal/config/config_test.go

@@ -0,0 +1,40 @@
+package config
+
+import "testing"
+
+func TestLoadDiskCloneModeDefaultsToReflink(t *testing.T) {
+	t.Parallel()
+
+	if got := loadDiskCloneMode(""); got != DiskCloneModeReflink {
+		t.Fatalf("disk clone mode = %q, want %q", got, DiskCloneModeReflink)
+	}
+}
+
+func TestDiskCloneModeValidate(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name    string
+		mode    DiskCloneMode
+		wantErr bool
+	}{
+		{name: "reflink", mode: DiskCloneModeReflink},
+		{name: "copy", mode: DiskCloneModeCopy},
+		{name: "empty", mode: "", wantErr: true},
+		{name: "unknown", mode: "auto", wantErr: true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			err := tt.mode.Validate()
+			if tt.wantErr && err == nil {
+				t.Fatal("Validate() error = nil, want error")
+			}
+			if !tt.wantErr && err != nil {
+				t.Fatalf("Validate() error = %v, want nil", err)
+			}
+		})
+	}
+}