Function TestDashToken_SetAppend

dash_token_test.go:83–172

(t *testing.T)

}

func TestDashToken_SetAppend(t *testing.T) {
	t.Parallel()

	t.Run("append into slice nested in a map (in place)", func(t *testing.T) {
		doc := map[string]any{"arr": []any{1, 2}}
		p, err := New("/arr/-")
		require.NoError(t, err)

		out, err := p.Set(doc, 3)
		require.NoError(t, err)

		// returned doc is the same map reference
		assert.Equal(t, doc, out)

		// map's slice was rebound in place
		arr, ok := doc["arr"].([]any)
		require.True(t, ok)
		assert.Equal(t, []any{1, 2, 3}, arr)
	})

	t.Run("append into top-level slice passed by value (return value is source of truth)", func(t *testing.T) {
		doc := []int{1, 2}
		p, err := New("/-")
		require.NoError(t, err)

		out, err := p.Set(doc, 3)
		require.NoError(t, err)

		// returned doc has the appended element
		outSlice, ok := out.([]int)
		require.True(t, ok)
		assert.Equal(t, []int{1, 2, 3}, outSlice)
	})

	t.Run("append into top-level *[]T (in place)", func(t *testing.T) {
		doc := []int{1, 2}
		p, err := New("/-")
		require.NoError(t, err)

		_, err = p.Set(&doc, 3)
		require.NoError(t, err)

		// caller's slice variable now has the appended element
		assert.Equal(t, []int{1, 2, 3}, doc)
	})

	t.Run("append into struct slice field reached via pointer (in place)", func(t *testing.T) {
		type holder struct {
			Arr []int `json:"arr"`
		}
		doc := &holder{Arr: []int{1, 2}}
		p, err := New("/arr/-")
		require.NoError(t, err)

		_, err = p.Set(doc, 3)
		require.NoError(t, err)

		assert.Equal(t, []int{1, 2, 3}, doc.Arr)