1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
import { toggle, sequence } from '../src/patterns';import { Machine } from '../src';
describe('patterns', () => {  describe('toggle pattern', () => {    it('should produce a partial state machine with a binary toggle', () => {      expect(toggle('on', 'off', 'SWITCH')).toEqual({        on: { on: { SWITCH: 'off' } },        off: { on: { SWITCH: 'on' } }      });    });  });
  describe('sequence pattern', () => {    it('should work with an array', () => {      const seq = ['one', 'two', 'three', 'last'];
      const sequenceMachine = Machine({        id: 'sequence',        ...sequence(seq)      });
      expect(sequenceMachine.transition(seq[0], 'NEXT').value).toEqual(seq[1]);
      expect(sequenceMachine.transition(seq[1], 'PREV').value).toEqual(seq[0]);
      expect(        sequenceMachine.transition(seq[seq.length - 1], 'NEXT').value      ).toEqual(seq[seq.length - 1]);
      expect(sequenceMachine.transition(seq[0], 'PREV').value).toEqual(seq[0]);    });
    it('should customize the next/prev events', () => {      const seq = ['one', 'two', 'three', 'last'];
      const sequenceMachine = Machine({        id: 'sequence',        ...sequence(seq, {          nextEvent: 'FORWARD',          prevEvent: 'BACK'        })      });
      expect(sequenceMachine.transition(seq[0], 'NEXT').value).toEqual(seq[0]);
      expect(sequenceMachine.transition(seq[1], 'PREV').value).toEqual(seq[1]);
      expect(sequenceMachine.transition(seq[0], 'FORWARD').value).toEqual(        seq[1]      );
      expect(sequenceMachine.transition(seq[1], 'BACK').value).toEqual(seq[0]);    });
    it('should allow next/prev events to be undefined', () => {      const seq = ['one', 'two', 'three', 'last'];
      const sequenceMachine = Machine({        id: 'sequence',        ...sequence(seq, {          nextEvent: 'FORWARD',          prevEvent: undefined        })      });
      expect(sequenceMachine.transition(seq[0], 'FORWARD').value).toEqual(        seq[1]      );
      expect(sequenceMachine.transition(seq[1], 'BACK').value).toEqual(seq[1]);
      const backSequenceMachine = Machine({        id: 'backSequence',        ...sequence(seq, {          nextEvent: undefined,          prevEvent: 'BACK'        })      });
      expect(backSequenceMachine.transition(seq[0], 'FORWARD').value).toEqual(        seq[0]      );
      expect(backSequenceMachine.transition(seq[1], 'BACK').value).toEqual(        seq[0]      );    });  });});