Function TestDashToken_GetAlwaysErrors

dash_token_test.go:18–69

RFC 6901 §4: the "-" token refers to the (nonexistent) element after the last array element. It is always an error on Get/Offset, valid only as the terminal token of a Set against a slice (append, per RFC 6902).

(t *testing.T)

// (append, per RFC 6902).

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

	t.Run("terminal dash on slice in map", func(t *testing.T) {
		doc := map[string]any{"arr": []any{1, 2, 3}}
		p, err := New("/arr/-")
		require.NoError(t, err)

		_, _, err = p.Get(doc)
		require.Error(t, err)
		require.ErrorIs(t, err, ErrDashToken)
		require.ErrorIs(t, err, ErrPointer)
	})

	t.Run("terminal dash on top-level slice", func(t *testing.T) {
		doc := []int{1, 2, 3}
		p, err := New("/-")
		require.NoError(t, err)

		_, _, err = p.Get(doc)
		require.Error(t, err)
		require.ErrorIs(t, err, ErrDashToken)
	})

	t.Run("intermediate dash during get", func(t *testing.T) {
		doc := map[string]any{"arr": []any{map[string]any{"x": 1}}}
		p, err := New("/arr/-/x")
		require.NoError(t, err)

		_, _, err = p.Get(doc)
		require.Error(t, err)
		require.ErrorIs(t, err, ErrDashToken)
	})

	t.Run("GetForToken on slice with dash", func(t *testing.T) {
		_, _, err := GetForToken([]int{1, 2}, "-")
		require.Error(t, err)
		require.ErrorIs(t, err, ErrDashToken)
	})

	t.Run("dash on map key is a regular lookup, not an error", func(t *testing.T) {
		// "-" is only special for arrays.
		// A literal "-" key in a map is fine.
		doc := map[string]any{"-": 42}
		p, err := New("/-")
		require.NoError(t, err)

		v, _, err := p.Get(doc)
		require.NoError(t, err)
		assert.Equal(t, 42, v)
	})
}

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