prosody-modules
12c7c0d7e1b0
mod_auth_token/mock.lua

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mod_auth_token/mock.lua @ 3436:12c7c0d7e1b0

mod_pubsub_text_interface/README: Fix typo (thanks perflyst)
author Kim Alvefur <zash@zash.se>
date Mon, 07 Jan 2019 19:46:04 +0100
parent 2956:d0ca211e1b0e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2956
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1 -- Source code taken from https://github.com/britzl/deftest
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2 -- Released under the MIT License. Copyright (c) 2009-2012 Norman Clarke.
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3
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4 --- Provides the ability to mock any module.
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5
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6 -- @usage
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7 --
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8 -- mock.mock(sys)
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9 --
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10 -- -- specifying return values
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11 -- sys.get_sys_info.returns({my_data})
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12 -- ...
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13 -- local sys_info = sys.get_sys_info() -- will be my_data
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14 -- assert(sys.get_sys_info.calls == 1) -- call counting
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15 -- ...
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16 -- local sys_info = sys.get_sys_info() -- original response as we are now out of mocked answers
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17 -- assert(sys.get_sys_info.calls == 2) -- call counting
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18 -- ...
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19 --
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20 -- -- specifying a replacement function
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21 -- sys.get_sys_info.replace(function () return my_data end)
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22 --
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23 -- ...
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24 -- local sys_info = sys.get_sys_info() -- will be my_data
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25 -- assert(sys.get_sys_info.calls == 3) -- call counting
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26 -- ...
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27 -- local sys_info = sys.get_sys_info() -- will still be my_data
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28 -- assert(sys.get_sys_info.calls == 4) -- call counting
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29 -- ...
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30 --
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31 -- -- cleaning up
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32 -- mock.unmock(sys) -- restore the sys library again
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33
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34 local mock = {}
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35
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36 --- Mock the specified module.
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37 -- Mocking the module extends the functions it contains with the ability to have their logic overridden.
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38 -- @param module module to mock
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39 -- @usage
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40 --
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41 -- -- mock module x
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42 -- mock.mock(x)
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43 --
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44 -- -- make x.f return 1, 2 then the original value
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45 -- x.f.returns({1, 2})
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46 -- print(x.f()) -- prints 1
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47 --
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48 -- -- make x.f return 1 forever
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49 -- x.f.replace(function () return 1 end)
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50 -- while true do print(x.f()) end -- prints 1 forever
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51 --
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52 -- -- counting calls
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53 -- assert(x.f.calls > 0)
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54 --
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55 -- -- return to original state of module x
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56 -- mock.unmock(x)
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57 --
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58 function mock.mock(module)
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59 assert(module, "You must provide a module to mock")
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60 for k,v in pairs(module) do
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61 if type(v) == "function" then
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62 local mock_fn = {
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63 calls = 0,
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64 answers = {},
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65 repl_fn = nil,
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66 orig_fn = v,
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67 params = {}
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68 }
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69 function mock_fn.returns(...)
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70 local arg_length = select("#", ...)
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71 assert(arg_length > 0, "You must provide some answers")
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72 local args = { ... }
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73 if arg_length == 1 then
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74 mock_fn.answers = args[1]
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75 else
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76 mock_fn.answers = args
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77 end
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78 end
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79 function mock_fn.always_returns(answer)
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80 mock_fn.repl_fn = function()
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81 return answer
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82 end
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83 end
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84 function mock_fn.replace(repl_fn)
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85 mock_fn.repl_fn = repl_fn
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86 end
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87 function mock_fn.original(...)
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88 return mock_fn.orig_fn(...)
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89 end
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90 function mock_fn.restore()
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91 mock_fn.repl_fn = nil
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92 end
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93 local mt = {
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94 __call = function (mock_fn, ...)
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95 mock_fn.calls = mock_fn.calls + 1
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96 local arg = {...}
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97
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98 if #arg > 0 then
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99 for i=1,#arg do
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100 mock_fn.params[i] = arg[i]
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101 end
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102 end
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103
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104 if mock_fn.answers[1] then
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105 local result = mock_fn.answers[1]
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106 table.remove(mock_fn.answers, 1)
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107 return result
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108 elseif mock_fn.repl_fn then
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109 return mock_fn.repl_fn(...)
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110 else
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111 return v(...)
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112 end
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113 end
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114 }
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115 setmetatable(mock_fn, mt)
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116 module[k] = mock_fn
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117 end
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118 end
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119 end
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120
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121 --- Remove the mocking capabilities from a module.
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122 -- @param module module to remove mocking from
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123 function mock.unmock(module)
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124 assert(module, "You must provide a module to unmock")
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125 for k,v in pairs(module) do
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126 if type(v) == "table" then
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127 if v.orig_fn then
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128 module[k] = v.orig_fn
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129 end
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130 end
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131 end
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132 end
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133
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134 return mock