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spec/util_promise_spec.lua @ 9469:cd2f742e5826
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author | Matthew Wild <mwild1@gmail.com> |
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date | Thu, 11 Oct 2018 10:39:11 +0100 |
parent | 9457:d01cff2f7a26 |
child | 9510:8ef46d09386a |
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 describe("race()", function () |
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142 it("works with fulfilled promises", function () |
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143 local p1, p2 = promise.resolve("yep"), promise.resolve("nope"); |
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144 local p = promise.race({ p1, p2 }); |
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145 local result; |
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146 p:next(function (v) |
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147 result = v; |
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148 end); |
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149 assert.equal("yep", result); |
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150 end); |
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151 it("works with pending promises", function () |
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152 local r1, r2; |
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153 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end); |
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154 local p = promise.race({ p1, p2 }); |
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155 |
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156 local result; |
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157 local cb = spy.new(function (v) |
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158 result = v; |
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159 end); |
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160 p:next(cb); |
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161 assert.spy(cb).was_called(0); |
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162 r2("yep"); |
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163 r1("nope"); |
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164 assert.spy(cb).was_called(1); |
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165 assert.equal("yep", result); |
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166 end); |
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167 end); |
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168 describe("all()", function () |
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169 it("works with fulfilled promises", function () |
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170 local p1, p2 = promise.resolve("yep"), promise.resolve("nope"); |
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171 local p = promise.all({ p1, p2 }); |
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172 local result; |
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173 p:next(function (v) |
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174 result = v; |
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175 end); |
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176 assert.same({ "yep", "nope" }, result); |
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177 end); |
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178 it("works with pending promises", function () |
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179 local r1, r2; |
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180 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end); |
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181 local p = promise.all({ p1, p2 }); |
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182 |
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183 local result; |
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184 local cb = spy.new(function (v) |
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185 result = v; |
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186 end); |
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187 p:next(cb); |
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188 assert.spy(cb).was_called(0); |
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189 r2("yep"); |
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190 assert.spy(cb).was_called(0); |
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191 r1("nope"); |
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192 assert.spy(cb).was_called(1); |
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193 assert.same({ "nope", "yep" }, result); |
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194 end); |
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195 it("rejects if any promise rejects", function () |
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196 local r1, r2; |
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197 local p1 = promise.new(function (resolve, reject) r1 = reject end); |
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198 local p2 = promise.new(function (resolve, reject) r2 = reject end); |
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199 local p = promise.all({ p1, p2 }); |
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200 |
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201 local result; |
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202 local cb = spy.new(function (v) |
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203 result = v; |
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204 end); |
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205 local cb_err = spy.new(function (v) |
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206 result = v; |
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207 end); |
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208 p:next(cb, cb_err); |
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209 assert.spy(cb).was_called(0); |
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210 assert.spy(cb_err).was_called(0); |
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211 r2("fail"); |
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212 assert.spy(cb).was_called(0); |
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213 assert.spy(cb_err).was_called(1); |
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214 r1("nope"); |
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215 assert.spy(cb).was_called(0); |
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216 assert.spy(cb_err).was_called(1); |
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217 assert.equal("fail", result); |
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218 end); |
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219 end); |
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220 describe("catch()", function () |
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221 it("works", function () |
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222 local result; |
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223 local p = promise.new(function (resolve) |
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224 error({ foo = true }); |
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225 end); |
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226 local cb1 = spy.new(function (v) |
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227 result = v; |
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228 end); |
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229 assert.spy(cb1).was_called(0); |
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230 p:catch(cb1); |
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231 assert.spy(cb1).was_called(1); |
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232 assert.same({ foo = true }, result); |
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233 end); |
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234 end); |
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235 it("promises may be resolved by other promises", function () |
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236 local r1, r2; |
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237 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end); |
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238 |
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239 local result; |
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240 local cb = spy.new(function (v) |
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241 result = v; |
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242 end); |
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243 p1:next(cb); |
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244 assert.spy(cb).was_called(0); |
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245 |
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246 r1(p2); |
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247 assert.spy(cb).was_called(0); |
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248 r2("yep"); |
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249 assert.spy(cb).was_called(1); |
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250 assert.equal("yep", result); |
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251 end); |
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252 describe("reject()", function () |
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253 it("returns a rejected promise", function () |
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254 local p = promise.reject("foo"); |
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255 local cb = spy.new(function () end); |
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util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
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256 p:next(cb); |
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util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
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257 assert.spy(cb).was_called(1); |
d54a0e129af8
util.promise: ES6-like API for promises
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parents:
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258 assert.spy(cb).was_called_with("foo"); |
d54a0e129af8
util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
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259 end); |
d54a0e129af8
util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
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changeset
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260 end); |
d54a0e129af8
util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
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changeset
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261 end); |