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spec/util_promise_spec.lua @ 11066:dc41c8dfd2b1
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author | Matthew Wild <mwild1@gmail.com> |
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date | Fri, 11 Sep 2020 12:37:07 +0100 |
parent | 10922:7d3dbb9eb3eb |
child | 11483:24ce9d380475 |
rev | line source |
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util.promise: ES6-like API for promises
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1 local promise = require "util.promise"; |
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2 |
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3 describe("util.promise", function () |
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4 --luacheck: ignore 212/resolve 212/reject |
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5 describe("new()", function () |
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6 it("returns a promise object", function () |
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7 assert(promise.new()); |
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8 end); |
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9 end); |
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10 it("notifies immediately for fulfilled promises", function () |
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11 local p = promise.new(function (resolve) |
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12 resolve("foo"); |
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13 end); |
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14 local cb = spy.new(function (v) |
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15 assert.equal("foo", v); |
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16 end); |
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17 p:next(cb); |
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18 assert.spy(cb).was_called(1); |
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19 end); |
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20 it("notifies on fulfilment of pending promises", function () |
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21 local r; |
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22 local p = promise.new(function (resolve) |
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23 r = resolve; |
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24 end); |
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25 local cb = spy.new(function (v) |
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26 assert.equal("foo", v); |
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27 end); |
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28 p:next(cb); |
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29 assert.spy(cb).was_called(0); |
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30 r("foo"); |
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31 assert.spy(cb).was_called(1); |
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32 end); |
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33 it("allows chaining :next() calls", function () |
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34 local r; |
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35 local result; |
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36 local p = promise.new(function (resolve) |
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37 r = resolve; |
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38 end); |
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39 local cb1 = spy.new(function (v) |
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40 assert.equal("foo", v); |
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41 return "bar"; |
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42 end); |
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43 local cb2 = spy.new(function (v) |
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44 assert.equal("bar", v); |
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45 result = v; |
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46 end); |
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47 p:next(cb1):next(cb2); |
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48 assert.spy(cb1).was_called(0); |
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49 assert.spy(cb2).was_called(0); |
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50 r("foo"); |
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51 assert.spy(cb1).was_called(1); |
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52 assert.spy(cb2).was_called(1); |
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53 assert.equal("bar", result); |
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54 end); |
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55 it("supports multiple :next() calls on the same promise", function () |
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56 local r; |
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57 local result; |
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58 local p = promise.new(function (resolve) |
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59 r = resolve; |
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60 end); |
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61 local cb1 = spy.new(function (v) |
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62 assert.equal("foo", v); |
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63 result = v; |
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64 end); |
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65 local cb2 = spy.new(function (v) |
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66 assert.equal("foo", v); |
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67 result = v; |
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68 end); |
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69 p:next(cb1); |
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70 p:next(cb2); |
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71 assert.spy(cb1).was_called(0); |
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72 assert.spy(cb2).was_called(0); |
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73 r("foo"); |
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74 assert.spy(cb1).was_called(1); |
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75 assert.spy(cb2).was_called(1); |
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76 assert.equal("foo", result); |
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77 end); |
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78 it("automatically rejects on error", function () |
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79 local r; |
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80 local p = promise.new(function (resolve) |
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81 r = resolve; |
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82 error("oh no"); |
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83 end); |
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84 local cb = spy.new(function () end); |
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85 local err_cb = spy.new(function (v) |
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86 assert.equal("oh no", v); |
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87 end); |
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88 p:next(cb, err_cb); |
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89 assert.spy(cb).was_called(0); |
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90 assert.spy(err_cb).was_called(1); |
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91 r("foo"); |
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92 assert.spy(cb).was_called(0); |
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93 assert.spy(err_cb).was_called(1); |
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94 end); |
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95 it("supports reject()", function () |
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96 local r, result; |
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97 local p = promise.new(function (resolve, reject) |
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98 r = reject; |
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99 end); |
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100 local cb = spy.new(function () end); |
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101 local err_cb = spy.new(function (v) |
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102 result = v; |
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103 assert.equal("oh doh", v); |
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104 end); |
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105 p:next(cb, err_cb); |
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106 assert.spy(cb).was_called(0); |
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107 assert.spy(err_cb).was_called(0); |
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108 r("oh doh"); |
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109 assert.spy(cb).was_called(0); |
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110 assert.spy(err_cb).was_called(1); |
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111 assert.equal("oh doh", result); |
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112 end); |
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113 it("supports chaining of rejected promises", function () |
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114 local r, result; |
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115 local p = promise.new(function (resolve, reject) |
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116 r = reject; |
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117 end); |
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118 local cb = spy.new(function () end); |
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119 local err_cb = spy.new(function (v) |
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120 result = v; |
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121 assert.equal("oh doh", v); |
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122 return "ok" |
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123 end); |
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124 local cb2 = spy.new(function (v) |
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125 result = v; |
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126 end); |
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127 local err_cb2 = spy.new(function () end); |
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128 p:next(cb, err_cb):next(cb2, err_cb2) |
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129 assert.spy(cb).was_called(0); |
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130 assert.spy(err_cb).was_called(0); |
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131 assert.spy(cb2).was_called(0); |
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132 assert.spy(err_cb2).was_called(0); |
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133 r("oh doh"); |
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134 assert.spy(cb).was_called(0); |
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135 assert.spy(err_cb).was_called(1); |
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136 assert.spy(cb2).was_called(1); |
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137 assert.spy(err_cb2).was_called(0); |
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138 assert.equal("ok", result); |
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139 end); |
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140 |
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141 it("propagates errors down the chain, even when some handlers are not provided", function () |
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142 local r, result; |
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143 local test_error = {}; |
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144 local p = promise.new(function (resolve, reject) |
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145 r = reject; |
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146 end); |
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147 local cb = spy.new(function () end); |
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148 local err_cb = spy.new(function (e) result = e end); |
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149 local p2 = p:next(function () error(test_error) end); |
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150 local p3 = p2:next(cb) |
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151 p3:catch(err_cb); |
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152 assert.spy(cb).was_called(0); |
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153 assert.spy(err_cb).was_called(0); |
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154 r("oh doh"); |
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155 assert.spy(cb).was_called(0); |
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156 assert.spy(err_cb).was_called(1); |
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157 assert.spy(err_cb).was_called_with("oh doh"); |
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158 assert.equal("oh doh", result); |
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159 end); |
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160 |
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161 it("propagates values down the chain, even when some handlers are not provided", function () |
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162 local r; |
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163 local p = promise.new(function (resolve, reject) |
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164 r = resolve; |
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165 end); |
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166 local cb = spy.new(function () end); |
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167 local err_cb = spy.new(function () end); |
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168 local p2 = p:next(function (v) return v; end); |
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169 local p3 = p2:catch(err_cb) |
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170 p3:next(cb); |
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171 assert.spy(cb).was_called(0); |
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172 assert.spy(err_cb).was_called(0); |
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173 r(1337); |
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174 assert.spy(cb).was_called(1); |
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175 assert.spy(cb).was_called_with(1337); |
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176 assert.spy(err_cb).was_called(0); |
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177 end); |
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178 |
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179 it("fulfilled promises do not call error handlers and do propagate value", function () |
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180 local p = promise.resolve("foo"); |
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181 local cb = spy.new(function () end); |
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182 local p2 = p:catch(cb); |
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183 assert.spy(cb).was_called(0); |
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184 |
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185 local cb2 = spy.new(function () end); |
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186 p2:catch(cb2); |
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187 assert.spy(cb2).was_called(0); |
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188 end); |
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189 |
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190 it("rejected promises do not call fulfilled handlers and do propagate reason", function () |
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191 local p = promise.reject("foo"); |
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192 local cb = spy.new(function () end); |
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193 local p2 = p:next(cb); |
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194 assert.spy(cb).was_called(0); |
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195 |
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196 local cb2 = spy.new(function () end); |
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197 local cb2_err = spy.new(function () end); |
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198 p2:next(cb2, cb2_err); |
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199 assert.spy(cb2).was_called(0); |
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200 assert.spy(cb2_err).was_called(1); |
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201 assert.spy(cb2_err).was_called_with("foo"); |
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202 end); |
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203 |
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204 describe("allows callbacks to return", function () |
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205 it("pending promises", function () |
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206 local r; |
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207 local p = promise.resolve() |
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208 local cb = spy.new(function () |
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209 return promise.new(function (resolve) |
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210 r = resolve; |
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211 end); |
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212 end); |
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213 local cb2 = spy.new(function () end); |
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214 p:next(cb):next(cb2); |
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215 assert.spy(cb).was_called(1); |
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216 assert.spy(cb2).was_called(0); |
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217 r("hello"); |
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218 assert.spy(cb).was_called(1); |
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219 assert.spy(cb2).was_called(1); |
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220 assert.spy(cb2).was_called_with("hello"); |
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221 end); |
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222 |
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223 it("resolved promises", function () |
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224 local p = promise.resolve() |
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225 local cb = spy.new(function () |
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226 return promise.resolve("hello"); |
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227 end); |
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228 local cb2 = spy.new(function () end); |
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229 p:next(cb):next(cb2); |
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230 assert.spy(cb).was_called(1); |
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231 assert.spy(cb2).was_called(1); |
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232 assert.spy(cb2).was_called_with("hello"); |
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233 end); |
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234 |
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235 it("rejected promises", function () |
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236 local p = promise.resolve() |
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237 local cb = spy.new(function () |
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238 return promise.reject("hello"); |
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239 end); |
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240 local cb2 = spy.new(function () |
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241 return promise.reject("goodbye"); |
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242 end); |
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243 local cb3 = spy.new(function () end); |
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244 p:next(cb):catch(cb2):catch(cb3); |
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245 assert.spy(cb).was_called(1); |
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246 assert.spy(cb2).was_called(1); |
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247 assert.spy(cb2).was_called_with("hello"); |
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248 assert.spy(cb3).was_called(1); |
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249 assert.spy(cb3).was_called_with("goodbye"); |
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250 end); |
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251 |
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252 it("ordinary values", function () |
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253 local p = promise.resolve() |
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254 local cb = spy.new(function () |
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255 return "hello" |
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256 end); |
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257 local cb2 = spy.new(function () end); |
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258 p:next(cb):next(cb2); |
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259 assert.spy(cb).was_called(1); |
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260 assert.spy(cb2).was_called(1); |
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261 assert.spy(cb2).was_called_with("hello"); |
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262 end); |
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263 |
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264 it("nil", function () |
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265 local p = promise.resolve() |
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266 local cb = spy.new(function () |
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267 return |
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268 end); |
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269 local cb2 = spy.new(function () end); |
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270 p:next(cb):next(cb2); |
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271 assert.spy(cb).was_called(1); |
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272 assert.spy(cb2).was_called(1); |
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273 assert.spy(cb2).was_called_with(nil); |
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274 end); |
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275 end); |
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276 |
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277 describe("race()", function () |
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278 it("works with fulfilled promises", function () |
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279 local p1, p2 = promise.resolve("yep"), promise.resolve("nope"); |
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280 local p = promise.race({ p1, p2 }); |
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281 local result; |
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282 p:next(function (v) |
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283 result = v; |
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284 end); |
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285 assert.equal("yep", result); |
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286 end); |
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287 it("works with pending promises", function () |
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288 local r1, r2; |
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289 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end); |
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290 local p = promise.race({ p1, p2 }); |
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291 |
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292 local result; |
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293 local cb = spy.new(function (v) |
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294 result = v; |
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295 end); |
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296 p:next(cb); |
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297 assert.spy(cb).was_called(0); |
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298 r2("yep"); |
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299 r1("nope"); |
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300 assert.spy(cb).was_called(1); |
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301 assert.equal("yep", result); |
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302 end); |
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303 end); |
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304 describe("all()", function () |
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305 it("works with fulfilled promises", function () |
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306 local p1, p2 = promise.resolve("yep"), promise.resolve("nope"); |
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307 local p = promise.all({ p1, p2 }); |
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308 local result; |
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309 p:next(function (v) |
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310 result = v; |
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311 end); |
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312 assert.same({ "yep", "nope" }, result); |
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313 end); |
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314 it("works with pending promises", function () |
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315 local r1, r2; |
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316 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end); |
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317 local p = promise.all({ p1, p2 }); |
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318 |
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319 local result; |
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320 local cb = spy.new(function (v) |
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321 result = v; |
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322 end); |
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323 p:next(cb); |
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324 assert.spy(cb).was_called(0); |
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325 r2("yep"); |
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326 assert.spy(cb).was_called(0); |
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327 r1("nope"); |
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328 assert.spy(cb).was_called(1); |
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329 assert.same({ "nope", "yep" }, result); |
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330 end); |
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331 it("rejects if any promise rejects", function () |
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332 local r1, r2; |
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333 local p1 = promise.new(function (resolve, reject) r1 = reject end); |
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334 local p2 = promise.new(function (resolve, reject) r2 = reject end); |
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335 local p = promise.all({ p1, p2 }); |
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336 |
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337 local result; |
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338 local cb = spy.new(function (v) |
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339 result = v; |
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340 end); |
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341 local cb_err = spy.new(function (v) |
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342 result = v; |
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343 end); |
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344 p:next(cb, cb_err); |
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345 assert.spy(cb).was_called(0); |
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346 assert.spy(cb_err).was_called(0); |
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347 r2("fail"); |
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348 assert.spy(cb).was_called(0); |
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349 assert.spy(cb_err).was_called(1); |
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350 r1("nope"); |
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351 assert.spy(cb).was_called(0); |
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352 assert.spy(cb_err).was_called(1); |
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353 assert.equal("fail", result); |
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354 end); |
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355 end); |
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356 describe("all_settled()", function () |
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357 it("works with fulfilled promises", function () |
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358 local p1, p2 = promise.resolve("yep"), promise.resolve("nope"); |
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359 local p = promise.all_settled({ p1, p2 }); |
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360 local result; |
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361 p:next(function (v) |
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362 result = v; |
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363 end); |
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364 assert.same({ |
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365 { status = "fulfilled", value = "yep" }; |
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366 { status = "fulfilled", value = "nope" }; |
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367 }, result); |
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368 end); |
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369 it("works with pending promises", function () |
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370 local r1, r2; |
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371 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end); |
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372 local p = promise.all_settled({ p1, p2 }); |
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373 |
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374 local result; |
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375 local cb = spy.new(function (v) |
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376 result = v; |
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377 end); |
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378 p:next(cb); |
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379 assert.spy(cb).was_called(0); |
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380 r2("yep"); |
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381 assert.spy(cb).was_called(0); |
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382 r1("nope"); |
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383 assert.spy(cb).was_called(1); |
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384 assert.same({ |
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385 { status = "fulfilled", value = "nope" }; |
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386 { status = "fulfilled", value = "yep" }; |
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387 }, result); |
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388 end); |
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389 it("works when some promises reject", function () |
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390 local r1, r2; |
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391 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (_, reject) r2 = reject end); |
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392 local p = promise.all_settled({ p1, p2 }); |
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393 |
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394 local result; |
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395 local cb = spy.new(function (v) |
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396 result = v; |
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397 end); |
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398 p:next(cb); |
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399 assert.spy(cb).was_called(0); |
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400 r2("this fails"); |
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401 assert.spy(cb).was_called(0); |
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402 r1("this succeeds"); |
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403 assert.spy(cb).was_called(1); |
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404 assert.same({ |
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405 { status = "fulfilled", value = "this succeeds" }; |
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406 { status = "rejected", reason = "this fails" }; |
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407 }, result); |
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408 end); |
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409 end); |
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410 describe("catch()", function () |
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411 it("works", function () |
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412 local result; |
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413 local p = promise.new(function (resolve) |
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414 error({ foo = true }); |
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415 end); |
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416 local cb1 = spy.new(function (v) |
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417 result = v; |
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418 end); |
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419 assert.spy(cb1).was_called(0); |
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420 p:catch(cb1); |
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421 assert.spy(cb1).was_called(1); |
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422 assert.same({ foo = true }, result); |
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423 end); |
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424 end); |
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425 it("promises may be resolved by other promises", function () |
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426 local r1, r2; |
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427 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end); |
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428 |
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429 local result; |
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430 local cb = spy.new(function (v) |
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431 result = v; |
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432 end); |
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433 p1:next(cb); |
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434 assert.spy(cb).was_called(0); |
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435 |
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436 r1(p2); |
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437 assert.spy(cb).was_called(0); |
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438 r2("yep"); |
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439 assert.spy(cb).was_called(1); |
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440 assert.equal("yep", result); |
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441 end); |
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442 describe("reject()", function () |
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443 it("returns a rejected promise", function () |
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444 local p = promise.reject("foo"); |
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445 local cb = spy.new(function () end); |
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446 p:catch(cb); |
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447 assert.spy(cb).was_called(1); |
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448 assert.spy(cb).was_called_with("foo"); |
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449 end); |
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450 it("returns a rejected promise and does not call on_fulfilled", function () |
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451 local p = promise.reject("foo"); |
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452 local cb = spy.new(function () end); |
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453 p:next(cb); |
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454 assert.spy(cb).was_called(0); |
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455 end); |
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456 end); |
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457 describe("finally()", function () |
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458 local p, p2, resolve, reject, on_finally; |
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459 before_each(function () |
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460 p = promise.new(function (_resolve, _reject) |
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461 resolve, reject = _resolve, _reject; |
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462 end); |
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463 on_finally = spy.new(function () end); |
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464 p2 = p:finally(on_finally); |
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465 end); |
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466 it("runs when a promise is resolved", function () |
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467 assert.spy(on_finally).was_called(0); |
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468 resolve("foo"); |
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469 assert.spy(on_finally).was_called(1); |
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470 assert.spy(on_finally).was_not_called_with("foo"); |
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471 end); |
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472 it("runs when a promise is rejected", function () |
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473 assert.spy(on_finally).was_called(0); |
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474 reject("foo"); |
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475 assert.spy(on_finally).was_called(1); |
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476 assert.spy(on_finally).was_not_called_with("foo"); |
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477 end); |
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478 it("returns a promise that fulfills with the original value", function () |
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479 local cb2 = spy.new(function () end); |
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480 p2:next(cb2); |
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481 assert.spy(on_finally).was_called(0); |
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482 assert.spy(cb2).was_called(0); |
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483 resolve("foo"); |
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484 assert.spy(on_finally).was_called(1); |
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485 assert.spy(cb2).was_called(1); |
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486 assert.spy(on_finally).was_not_called_with("foo"); |
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487 assert.spy(cb2).was_called_with("foo"); |
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488 end); |
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489 it("returns a promise that rejects with the original error", function () |
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490 local on_finally_err = spy.new(function () end); |
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491 local on_finally_ok = spy.new(function () end); |
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492 p2:catch(on_finally_err); |
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493 p2:next(on_finally_ok); |
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494 assert.spy(on_finally).was_called(0); |
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495 assert.spy(on_finally_err).was_called(0); |
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496 reject("foo"); |
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497 assert.spy(on_finally).was_called(1); |
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498 -- Since the original promise was rejected, the finally promise should also be |
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499 assert.spy(on_finally_ok).was_called(0); |
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500 assert.spy(on_finally_err).was_called(1); |
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501 assert.spy(on_finally).was_not_called_with("foo"); |
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502 assert.spy(on_finally_err).was_called_with("foo"); |
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503 end); |
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504 it("returns a promise that rejects with an uncaught error inside on_finally", function () |
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505 p = promise.new(function (_resolve, _reject) |
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506 resolve, reject = _resolve, _reject; |
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507 end); |
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508 local test_error = {}; |
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509 on_finally = spy.new(function () error(test_error) end); |
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510 p2 = p:finally(on_finally); |
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511 |
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512 local on_finally_err = spy.new(function () end); |
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513 p2:catch(on_finally_err); |
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514 assert.spy(on_finally).was_called(0); |
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515 assert.spy(on_finally_err).was_called(0); |
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516 reject("foo"); |
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517 assert.spy(on_finally).was_called(1); |
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518 assert.spy(on_finally_err).was_called(1); |
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519 assert.spy(on_finally).was_not_called_with("foo"); |
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520 assert.spy(on_finally).was_not_called_with(test_error); |
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521 assert.spy(on_finally_err).was_called_with(test_error); |
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522 end); |
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523 end); |
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524 describe("try()", function () |
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525 it("works with functions that return a promise", function () |
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526 local resolve; |
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527 local p = promise.try(function () |
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528 return promise.new(function (_resolve) |
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529 resolve = _resolve; |
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530 end); |
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531 end); |
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532 assert.is_function(resolve); |
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533 local on_resolved = spy.new(function () end); |
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534 p:next(on_resolved); |
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535 assert.spy(on_resolved).was_not_called(); |
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536 resolve("foo"); |
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537 assert.spy(on_resolved).was_called_with("foo"); |
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538 end); |
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539 |
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540 it("works with functions that return a value", function () |
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541 local p = promise.try(function () |
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542 return "foo"; |
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543 end); |
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544 local on_resolved = spy.new(function () end); |
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545 p:next(on_resolved); |
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546 assert.spy(on_resolved).was_called_with("foo"); |
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547 end); |
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548 |
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549 it("works with functions that return a promise that rejects", function () |
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550 local reject; |
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551 local p = promise.try(function () |
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552 return promise.new(function (_, _reject) |
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553 reject = _reject; |
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554 end); |
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555 end); |
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556 assert.is_function(reject); |
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557 local on_rejected = spy.new(function () end); |
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558 p:catch(on_rejected); |
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559 assert.spy(on_rejected).was_not_called(); |
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560 reject("foo"); |
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561 assert.spy(on_rejected).was_called_with("foo"); |
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562 end); |
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563 |
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564 it("works with functions that throw errors", function () |
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565 local test_error = {}; |
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566 local p = promise.try(function () |
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567 error(test_error); |
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568 end); |
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569 local on_rejected = spy.new(function () end); |
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570 p:catch(on_rejected); |
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571 assert.spy(on_rejected).was_called(1); |
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572 assert.spy(on_rejected).was_called_with(test_error); |
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573 end); |
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574 end); |
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575 end); |