Debounce_test.res
1open VitestHelpers
2
3@module("vitest") @val external vi: 'a = "vi"
4
5describe("Debounce", () => {
6 testAsync("function is called after delay when created with make", async t => {
7 let mockFn = vi["fn"]()
8 let _handle = Debounce.make(mockFn, 50)
9
10 // Function should not be called immediately
11 t->expect(mockFn["mock"]["calls"]->Array.length)->toEqual(0)
12
13 // Wait for delay
14 await (%raw(`new Promise(r => setTimeout(r, 60))`): promise<unit>)
15
16 // Now it should be called
17 t->expect(mockFn["mock"]["calls"]->Array.length)->toEqual(1)
18 })
19
20 testAsync("cancel prevents function from being called", async t => {
21 let mockFn = vi["fn"]()
22 let handle = Debounce.make(mockFn, 50)
23
24 // Cancel before delay
25 handle->Debounce.cancel
26
27 // Wait for original delay
28 await (%raw(`new Promise(r => setTimeout(r, 60))`): promise<unit>)
29
30 // Should not be called since it was cancelled
31 t->expect(mockFn["mock"]["calls"]->Array.length)->toEqual(0)
32 })
33
34 testAsync("cancel is safe to call multiple times", async t => {
35 let mockFn = vi["fn"]()
36 let handle = Debounce.make(mockFn, 50)
37
38 // Cancel multiple times
39 handle->Debounce.cancel
40 handle->Debounce.cancel
41 handle->Debounce.cancel
42
43 // Wait for original delay
44 await (%raw(`new Promise(r => setTimeout(r, 60))`): promise<unit>)
45
46 // Should not be called
47 t->expect(mockFn["mock"]["calls"]->Array.length)->toEqual(0)
48 })
49
50 testAsync("cancel is safe to call after function already executed", async t => {
51 let mockFn = vi["fn"]()
52 let handle = Debounce.make(mockFn, 50)
53
54 // Wait for it to execute
55 await (%raw(`new Promise(r => setTimeout(r, 60))`): promise<unit>)
56
57 // Should be called once
58 t->expect(mockFn["mock"]["calls"]->Array.length)->toEqual(1)
59
60 // Cancel after execution should be safe (no-op)
61 handle->Debounce.cancel
62
63 // Still only called once
64 t->expect(mockFn["mock"]["calls"]->Array.length)->toEqual(1)
65 })
66
67 testAsync("creating new debounce and cancelling old one works", async t => {
68 let mockFn1 = vi["fn"]()
69 let mockFn2 = vi["fn"]()
70
71 let handle1 = Debounce.make(mockFn1, 50)
72
73 // Cancel first and create second before first delay completes
74 handle1->Debounce.cancel
75 let _handle2 = Debounce.make(mockFn2, 50)
76
77 // Wait for delay
78 await (%raw(`new Promise(r => setTimeout(r, 60))`): promise<unit>)
79
80 // First should not be called (cancelled), second should be called
81 t->expect(mockFn1["mock"]["calls"]->Array.length)->toEqual(0)
82 t->expect(mockFn2["mock"]["calls"]->Array.length)->toEqual(1)
83 })
84})
