prosody-modules
d0ca211e1b0e
mod_auth_token/mock.lua

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mod_auth_token/mock.lua @ 2956:d0ca211e1b0e

New HMAC token authentication module for Prosody.
author JC Brand <jc@opkode.com>
date Tue, 27 Mar 2018 10:48:04 +0200
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2938:f000ba14d531 2956:d0ca211e1b0e
1 -- Source code taken from https://github.com/britzl/deftest
2 -- Released under the MIT License. Copyright (c) 2009-2012 Norman Clarke.
3
4 --- Provides the ability to mock any module.
5
6 -- @usage
7 --
8 -- mock.mock(sys)
9 --
10 -- -- specifying return values
11 -- sys.get_sys_info.returns({my_data})
12 -- ...
13 -- local sys_info = sys.get_sys_info() -- will be my_data
14 -- assert(sys.get_sys_info.calls == 1) -- call counting
15 -- ...
16 -- local sys_info = sys.get_sys_info() -- original response as we are now out of mocked answers
17 -- assert(sys.get_sys_info.calls == 2) -- call counting
18 -- ...
19 --
20 -- -- specifying a replacement function
21 -- sys.get_sys_info.replace(function () return my_data end)
22 --
23 -- ...
24 -- local sys_info = sys.get_sys_info() -- will be my_data
25 -- assert(sys.get_sys_info.calls == 3) -- call counting
26 -- ...
27 -- local sys_info = sys.get_sys_info() -- will still be my_data
28 -- assert(sys.get_sys_info.calls == 4) -- call counting
29 -- ...
30 --
31 -- -- cleaning up
32 -- mock.unmock(sys) -- restore the sys library again
33
34 local mock = {}
35
36 --- Mock the specified module.
37 -- Mocking the module extends the functions it contains with the ability to have their logic overridden.
38 -- @param module module to mock
39 -- @usage
40 --
41 -- -- mock module x
42 -- mock.mock(x)
43 --
44 -- -- make x.f return 1, 2 then the original value
45 -- x.f.returns({1, 2})
46 -- print(x.f()) -- prints 1
47 --
48 -- -- make x.f return 1 forever
49 -- x.f.replace(function () return 1 end)
50 -- while true do print(x.f()) end -- prints 1 forever
51 --
52 -- -- counting calls
53 -- assert(x.f.calls > 0)
54 --
55 -- -- return to original state of module x
56 -- mock.unmock(x)
57 --
58 function mock.mock(module)
59 assert(module, "You must provide a module to mock")
60 for k,v in pairs(module) do
61 if type(v) == "function" then
62 local mock_fn = {
63 calls = 0,
64 answers = {},
65 repl_fn = nil,
66 orig_fn = v,
67 params = {}
68 }
69 function mock_fn.returns(...)
70 local arg_length = select("#", ...)
71 assert(arg_length > 0, "You must provide some answers")
72 local args = { ... }
73 if arg_length == 1 then
74 mock_fn.answers = args[1]
75 else
76 mock_fn.answers = args
77 end
78 end
79 function mock_fn.always_returns(answer)
80 mock_fn.repl_fn = function()
81 return answer
82 end
83 end
84 function mock_fn.replace(repl_fn)
85 mock_fn.repl_fn = repl_fn
86 end
87 function mock_fn.original(...)
88 return mock_fn.orig_fn(...)
89 end
90 function mock_fn.restore()
91 mock_fn.repl_fn = nil
92 end
93 local mt = {
94 __call = function (mock_fn, ...)
95 mock_fn.calls = mock_fn.calls + 1
96 local arg = {...}
97
98 if #arg > 0 then
99 for i=1,#arg do
100 mock_fn.params[i] = arg[i]
101 end
102 end
103
104 if mock_fn.answers[1] then
105 local result = mock_fn.answers[1]
106 table.remove(mock_fn.answers, 1)
107 return result
108 elseif mock_fn.repl_fn then
109 return mock_fn.repl_fn(...)
110 else
111 return v(...)
112 end
113 end
114 }
115 setmetatable(mock_fn, mt)
116 module[k] = mock_fn
117 end
118 end
119 end
120
121 --- Remove the mocking capabilities from a module.
122 -- @param module module to remove mocking from
123 function mock.unmock(module)
124 assert(module, "You must provide a module to unmock")
125 for k,v in pairs(module) do
126 if type(v) == "table" then
127 if v.orig_fn then
128 module[k] = v.orig_fn
129 end
130 end
131 end
132 end
133
134 return mock