frame_nil_test.go RawHistoryFolder

1package ansi
2
3import (
4	"testing"
5
6	"github.com/stretchr/testify/require"
7)
8
9type nilPointerSource struct{}
10
11func (*nilPointerSource) Columns() int       { panic("nil source method called") }
12func (*nilPointerSource) Rows() int          { panic("nil source method called") }
13func (*nilPointerSource) Cell(int, int) Cell { panic("nil source method called") }
14
15type nilSliceSource []int
16
17func (nilSliceSource) Columns() int       { panic("nil source method called") }
18func (nilSliceSource) Rows() int          { panic("nil source method called") }
19func (nilSliceSource) Cell(int, int) Cell { panic("nil source method called") }
20
21type nilMapSource map[int]int
22
23func (nilMapSource) Columns() int       { panic("nil source method called") }
24func (nilMapSource) Rows() int          { panic("nil source method called") }
25func (nilMapSource) Cell(int, int) Cell { panic("nil source method called") }
26
27type nilFuncSource func()
28
29func (nilFuncSource) Columns() int       { panic("nil source method called") }
30func (nilFuncSource) Rows() int          { panic("nil source method called") }
31func (nilFuncSource) Cell(int, int) Cell { panic("nil source method called") }
32
33type nilChanSource chan int
34
35func (nilChanSource) Columns() int       { panic("nil source method called") }
36func (nilChanSource) Rows() int          { panic("nil source method called") }
37func (nilChanSource) Cell(int, int) Cell { panic("nil source method called") }
38
39func TestRendererRejectsTypedNilSourcesBeforeCallingMethods(t *testing.T) {
40	for name, source := range map[string]CellSource{
41		"interface": nil, "frame": (*Frame)(nil), "pointer": (*nilPointerSource)(nil),
42		"slice": nilSliceSource(nil), "map": nilMapSource(nil),
43		"function": nilFuncSource(nil), "channel": nilChanSource(nil),
44	} {
45		t.Run(name, func(t *testing.T) {
46			_, err := New(Capabilities{}).Prepare(source, nil, false)
47			require.EqualError(t, err, "nil cell source")
48		})
49	}
50}