json marshaling item

item/item.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"time"
 
+	"github.com/google/go-cmp/cmp"
 	"github.com/google/uuid"
 )
 
@@ -68,3 +69,10 @@ func NewItem(k Kind, body string) Item {
 		Body:    body,
 	}
 }
+
+func ItemDiff(exp, got Item) string {
+	expJSON, _ := json.Marshal(exp)
+	actJSON, _ := json.Marshal(got)
+
+	return cmp.Diff(string(expJSON), string(actJSON))
+}

item/item_test.go

@@ -0,0 +1,83 @@
+package item_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+	"time"
+
+	"go-mod.ewintr.nl/planner/item"
+)
+
+func TestItemJSON(t *testing.T) {
+	t.Parallel()
+
+	for _, tc := range []struct {
+		name    string
+		item    item.Item
+		expJSON string
+	}{
+		{
+			name: "minimal",
+			item: item.Item{
+				ID:   "a",
+				Kind: item.KindTask,
+				Body: `{"title":"title"}`,
+			},
+			expJSON: `{
+  "recurrer": "",
+  "id": "a",
+  "kind": "task",
+  "updated": "0001-01-01T00:00:00Z",
+  "deleted": false,
+  "date": "",
+  "recurNext": "",
+  "body": "{\"title\":\"title\"}"
+}`,
+		},
+		{
+			name: "full",
+			item: item.Item{
+				ID:        "a",
+				Kind:      item.KindTask,
+				Updated:   time.Date(2024, 12, 25, 11, 9, 0, 0, time.UTC),
+				Deleted:   true,
+				Date:      item.NewDate(2024, 12, 26),
+				Recurrer:  item.NewRecurrer("2024-12-25, daily"),
+				RecurNext: item.NewDateFromString("2024-12-30"),
+				Body:      `{"title":"title"}`,
+			},
+			expJSON: `{
+  "recurrer": "2024-12-25, daily",
+  "id": "a",
+  "kind": "task",
+  "updated": "2024-12-25T11:09:00Z",
+  "deleted": true,
+  "date": "2024-12-26",
+  "recurNext": "2024-12-30",
+  "body": "{\"title\":\"title\"}"
+}`,
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			actJSON, err := json.Marshal(tc.item)
+			if err != nil {
+				t.Errorf("exp nil, got %v", err)
+			}
+			expJSON := bytes.NewBuffer([]byte(``))
+			if err := json.Compact(expJSON, []byte(tc.expJSON)); err != nil {
+				t.Errorf("exp nil, got %v", err)
+			}
+			if expJSON.String() != string(actJSON) {
+				t.Errorf("exp %v, got %v", expJSON.String(), string(actJSON))
+			}
+			var actItem item.Item
+			if err := json.Unmarshal(actJSON, &actItem); err != nil {
+				t.Errorf("exp nil, got %v", err)
+			}
+			if diff := item.ItemDiff(tc.item, actItem); diff != "" {
+				t.Errorf("(+exp, -got)%s\n", diff)
+			}
+		})
+	}
+}