🧪 Test json.Marshaler implementation for Entry

models/entry.go

@@ -155,3 +155,7 @@ func (e *Entry) getFieldUnarshalChan(in []byte) chan Meta {
 	}()
 	return ch
 }
+
+func (e Entry) MarshalJSON() ([]byte, error) {
+	return []byte(`{}`), nil
+}

models/entry_test.go

@@ -14,6 +14,7 @@ import (
 // Type assertions
 var _ encoding.TextMarshaler = Entry{}
 var _ encoding.TextUnmarshaler = new(Entry)
+var _ json.Marshaler = Entry{}
 
 func TestEntryMarshal(t *testing.T) {
 	when := time.Now()
@@ -187,3 +188,44 @@ func TestScan(t *testing.T) {
 	assert.Equal(t, "@bar 42@nobody", scan.Text())
 	assert.False(t, scan.Scan())
 }
+
+func TestEntryJsonMarshal(t *testing.T) {
+	when := time.Now()
+	whens := when.Format(DateFormat)
+	simple := []Meta{}
+	tests := []struct {
+		name   string
+		title  string
+		date   time.Time
+		fields []Meta
+		out    string
+		err    error
+	}{
+		{"simple", "A Title", when, simple, `{"title":"A Title","date":"` + whens + `"}`, nil},
+		{"one-field", "A Title 2", when, []Meta{{"age", 41}}, `{"title":"A Title 2","date":"` + whens + `","age":41}`, nil},
+		{"skip-title-field", "A Title", when, []Meta{{"title", "Different title"}}, `{"title":"A Title","date":"` + whens + `"}`, nil},
+		{"skip-date-field", "A Title", when, []Meta{{"date", when.Add(time.Hour)}}, `{"title":"A Title","date":"` + whens + `"}`, nil},
+		{"skip-dupe-field", "A Title", when, []Meta{{"foo", "bar"}, {"foo", "baz"}}, `{"title":"A Title","date":"` + whens + `","foo": "bar"}`, nil},
+		{"two-fields", "A Title", when, []Meta{{"foo", "bar"}, {"baz", 42}}, `{"title":"A Title","date":"` + whens + `","foo": "bar","baz":42}`, nil},
+		{"empty-title", "", when, simple, "", ErrorMissingTitle},
+		{"empty-date", "A Title", time.Time{}, simple, "", ErrorMissingDate},
+		{"obj-field", "A Title", when, []Meta{{"obj", json.RawMessage(`{"foo":"bar","title":"Sub-title"}`)}}, `{"title":"A Title","date":"` + whens + `","obj":{"foo":"bar","title":"Sub-title"}}`, nil},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, getEntryJsonMarshalTestRunner(tt.title, tt.date, tt.fields, tt.out, tt.err))
+	}
+}
+
+func getEntryJsonMarshalTestRunner(title string, date time.Time, fields []Meta, out string, err error) func(t *testing.T) {
+	return func(t *testing.T) {
+		e := Entry{title, date, fields}
+		o, er := json.Marshal(e)
+		if err == nil {
+			assert.JSONEq(t, out, string(o))
+
+		} else {
+			assert.ErrorIs(t, er, err)
+		}
+	}
+}