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d7fdd418adf8
spec/util_promise_spec.lua

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spec/util_promise_spec.lua @ 9557:d7fdd418adf8

util.promise: Add tests ensuring returning a promise resolves the current promise with that promise
author Matthew Wild <mwild1@gmail.com>
date Fri, 26 Oct 2018 09:23:00 +0100
parent 9551:7421379ba464
child 10297:da9f21a70e52
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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 end);
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252
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253 describe("race()", function ()
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254 it("works with fulfilled promises", function ()
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255 local p1, p2 = promise.resolve("yep"), promise.resolve("nope");
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256 local p = promise.race({ p1, p2 });
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257 local result;
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258 p:next(function (v)
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259 result = v;
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260 end);
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261 assert.equal("yep", result);
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262 end);
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263 it("works with pending promises", function ()
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264 local r1, r2;
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265 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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266 local p = promise.race({ p1, p2 });
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267
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268 local result;
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269 local cb = spy.new(function (v)
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270 result = v;
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271 end);
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272 p:next(cb);
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273 assert.spy(cb).was_called(0);
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274 r2("yep");
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275 r1("nope");
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276 assert.spy(cb).was_called(1);
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277 assert.equal("yep", result);
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278 end);
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279 end);
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280 describe("all()", function ()
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281 it("works with fulfilled promises", function ()
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282 local p1, p2 = promise.resolve("yep"), promise.resolve("nope");
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283 local p = promise.all({ p1, p2 });
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284 local result;
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285 p:next(function (v)
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286 result = v;
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287 end);
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288 assert.same({ "yep", "nope" }, result);
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289 end);
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290 it("works with pending promises", function ()
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291 local r1, r2;
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292 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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293 local p = promise.all({ p1, p2 });
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294
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295 local result;
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296 local cb = spy.new(function (v)
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297 result = v;
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298 end);
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299 p:next(cb);
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300 assert.spy(cb).was_called(0);
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301 r2("yep");
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302 assert.spy(cb).was_called(0);
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303 r1("nope");
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304 assert.spy(cb).was_called(1);
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305 assert.same({ "nope", "yep" }, result);
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306 end);
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307 it("rejects if any promise rejects", function ()
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308 local r1, r2;
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309 local p1 = promise.new(function (resolve, reject) r1 = reject end);
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310 local p2 = promise.new(function (resolve, reject) r2 = reject end);
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311 local p = promise.all({ p1, p2 });
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312
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313 local result;
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314 local cb = spy.new(function (v)
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315 result = v;
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316 end);
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317 local cb_err = spy.new(function (v)
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318 result = v;
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319 end);
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320 p:next(cb, cb_err);
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321 assert.spy(cb).was_called(0);
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322 assert.spy(cb_err).was_called(0);
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323 r2("fail");
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324 assert.spy(cb).was_called(0);
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diff changeset
325 assert.spy(cb_err).was_called(1);
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326 r1("nope");
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327 assert.spy(cb).was_called(0);
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328 assert.spy(cb_err).was_called(1);
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329 assert.equal("fail", result);
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330 end);
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parents:
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331 end);
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parents:
diff changeset
332 describe("catch()", function ()
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333 it("works", function ()
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334 local result;
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335 local p = promise.new(function (resolve)
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336 error({ foo = true });
d54a0e129af8 util.promise: ES6-like API for promises
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337 end);
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parents:
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338 local cb1 = spy.new(function (v)
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339 result = v;
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340 end);
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parents:
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341 assert.spy(cb1).was_called(0);
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parents:
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342 p:catch(cb1);
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
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343 assert.spy(cb1).was_called(1);
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parents:
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344 assert.same({ foo = true }, result);
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345 end);
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parents:
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346 end);
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parents:
diff changeset
347 it("promises may be resolved by other promises", function ()
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parents:
diff changeset
348 local r1, r2;
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parents:
diff changeset
349 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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parents:
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350
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parents:
diff changeset
351 local result;
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parents:
diff changeset
352 local cb = spy.new(function (v)
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parents:
diff changeset
353 result = v;
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
354 end);
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
355 p1:next(cb);
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
356 assert.spy(cb).was_called(0);
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
357
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
358 r1(p2);
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
359 assert.spy(cb).was_called(0);
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
360 r2("yep");
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
361 assert.spy(cb).was_called(1);
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
362 assert.equal("yep", result);
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
363 end);
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
364 describe("reject()", function ()
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
365 it("returns a rejected promise", function ()
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
366 local p = promise.reject("foo");
9457
d01cff2f7a26 util.promise tests: Fix luacheck warnings
Matthew Wild <mwild1@gmail.com>
parents: 9456
diff changeset
367 local cb = spy.new(function () end);
9510
8ef46d09386a util.promise: Fix promise.reject() to return a rejected promise, and fix buggy test for it
Matthew Wild <mwild1@gmail.com>
parents: 9457
diff changeset
368 p:catch(cb);
9456
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parents:
diff changeset
369 assert.spy(cb).was_called(1);
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
370 assert.spy(cb).was_called_with("foo");
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
371 end);
9511
cb88d729e98d util.promise: Add additional test for promise.reject()
Matthew Wild <mwild1@gmail.com>
parents: 9510
diff changeset
372 it("returns a rejected promise and does not call on_fulfilled", function ()
cb88d729e98d util.promise: Add additional test for promise.reject()
Matthew Wild <mwild1@gmail.com>
parents: 9510
diff changeset
373 local p = promise.reject("foo");
cb88d729e98d util.promise: Add additional test for promise.reject()
Matthew Wild <mwild1@gmail.com>
parents: 9510
diff changeset
374 local cb = spy.new(function () end);
cb88d729e98d util.promise: Add additional test for promise.reject()
Matthew Wild <mwild1@gmail.com>
parents: 9510
diff changeset
375 p:next(cb);
cb88d729e98d util.promise: Add additional test for promise.reject()
Matthew Wild <mwild1@gmail.com>
parents: 9510
diff changeset
376 assert.spy(cb).was_called(0);
cb88d729e98d util.promise: Add additional test for promise.reject()
Matthew Wild <mwild1@gmail.com>
parents: 9510
diff changeset
377 end);
9456
d54a0e129af8 util.promise: ES6-like API for promises
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
378 end);
9514
9db707a86a25 util.promise: Add promise:finally()
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parents: 9511
diff changeset
379 describe("finally()", function ()
9db707a86a25 util.promise: Add promise:finally()
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parents: 9511
diff changeset
380 local p, p2, resolve, reject, on_finally;
9db707a86a25 util.promise: Add promise:finally()
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parents: 9511
diff changeset
381 before_each(function ()
9db707a86a25 util.promise: Add promise:finally()
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parents: 9511
diff changeset
382 p = promise.new(function (_resolve, _reject)
9db707a86a25 util.promise: Add promise:finally()
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parents: 9511
diff changeset
383 resolve, reject = _resolve, _reject;
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
384 end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
385 on_finally = spy.new(function () end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
386 p2 = p:finally(on_finally);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
387 end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
388 it("runs when a promise is resolved", function ()
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
389 assert.spy(on_finally).was_called(0);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
390 resolve("foo");
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
391 assert.spy(on_finally).was_called(1);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
392 assert.spy(on_finally).was_not_called_with("foo");
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
393 end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
394 it("runs when a promise is rejected", function ()
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
395 assert.spy(on_finally).was_called(0);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
396 reject("foo");
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
397 assert.spy(on_finally).was_called(1);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
398 assert.spy(on_finally).was_not_called_with("foo");
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
399 end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
400 it("returns a promise that fulfills with the original value", function ()
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
401 local cb2 = spy.new(function () end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
402 p2:next(cb2);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
403 assert.spy(on_finally).was_called(0);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
404 assert.spy(cb2).was_called(0);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
405 resolve("foo");
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
406 assert.spy(on_finally).was_called(1);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
407 assert.spy(cb2).was_called(1);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
408 assert.spy(on_finally).was_not_called_with("foo");
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
409 assert.spy(cb2).was_called_with("foo");
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
410 end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
411 it("returns a promise that rejects with the original error", function ()
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
412 local on_finally_err = spy.new(function () end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
413 local on_finally_ok = spy.new(function () end);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
414 p2:catch(on_finally_err);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
415 p2:next(on_finally_ok);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
416 assert.spy(on_finally).was_called(0);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
417 assert.spy(on_finally_err).was_called(0);
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parents: 9511
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418 reject("foo");
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419 assert.spy(on_finally).was_called(1);
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420 -- Since the original promise was rejected, the finally promise should also be
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421 assert.spy(on_finally_ok).was_called(0);
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422 assert.spy(on_finally_err).was_called(1);
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423 assert.spy(on_finally).was_not_called_with("foo");
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424 assert.spy(on_finally_err).was_called_with("foo");
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425 end);
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426 it("returns a promise that rejects with an uncaught error inside on_finally", function ()
9db707a86a25 util.promise: Add promise:finally()
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427 p = promise.new(function (_resolve, _reject)
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428 resolve, reject = _resolve, _reject;
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429 end);
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430 local test_error = {};
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431 on_finally = spy.new(function () error(test_error) end);
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432 p2 = p:finally(on_finally);
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433
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434 local on_finally_err = spy.new(function () end);
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435 p2:catch(on_finally_err);
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parents: 9511
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436 assert.spy(on_finally).was_called(0);
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parents: 9511
diff changeset
437 assert.spy(on_finally_err).was_called(0);
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438 reject("foo");
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439 assert.spy(on_finally).was_called(1);
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440 assert.spy(on_finally_err).was_called(1);
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441 assert.spy(on_finally).was_not_called_with("foo");
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442 assert.spy(on_finally).was_not_called_with(test_error);
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443 assert.spy(on_finally_err).was_called_with(test_error);
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444 end);
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445 end);
9517
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446 describe("try()", function ()
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447 it("works with functions that return a promise", function ()
b1c6ede17592 util.promise: Add promise.try()
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448 local resolve;
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449 local p = promise.try(function ()
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450 return promise.new(function (_resolve)
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451 resolve = _resolve;
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452 end);
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453 end);
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454 assert.is_function(resolve);
b1c6ede17592 util.promise: Add promise.try()
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parents: 9514
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455 local on_resolved = spy.new(function () end);
b1c6ede17592 util.promise: Add promise.try()
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456 p:next(on_resolved);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
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457 assert.spy(on_resolved).was_not_called();
b1c6ede17592 util.promise: Add promise.try()
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458 resolve("foo");
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459 assert.spy(on_resolved).was_called_with("foo");
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Matthew Wild <mwild1@gmail.com>
parents: 9514
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460 end);
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parents: 9514
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461
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parents: 9514
diff changeset
462 it("works with functions that return a value", function ()
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parents: 9514
diff changeset
463 local p = promise.try(function ()
b1c6ede17592 util.promise: Add promise.try()
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diff changeset
464 return "foo";
b1c6ede17592 util.promise: Add promise.try()
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465 end);
b1c6ede17592 util.promise: Add promise.try()
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parents: 9514
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466 local on_resolved = spy.new(function () end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
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467 p:next(on_resolved);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
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468 assert.spy(on_resolved).was_called_with("foo");
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
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469 end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
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470
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
471 it("works with functions that return a promise that rejects", function ()
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
472 local reject;
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
473 local p = promise.try(function ()
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parents: 9514
diff changeset
474 return promise.new(function (_, _reject)
b1c6ede17592 util.promise: Add promise.try()
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parents: 9514
diff changeset
475 reject = _reject;
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
476 end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
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477 end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
478 assert.is_function(reject);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
479 local on_rejected = spy.new(function () end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
480 p:catch(on_rejected);
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
481 assert.spy(on_rejected).was_not_called();
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Matthew Wild <mwild1@gmail.com>
parents: 9514
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482 reject("foo");
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
483 assert.spy(on_rejected).was_called_with("foo");
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
484 end);
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parents: 9514
diff changeset
485
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
486 it("works with functions that throw errors", function ()
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
487 local test_error = {};
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
488 local p = promise.try(function ()
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
489 error(test_error);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
490 end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
491 local on_rejected = spy.new(function () end);
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
492 p:catch(on_rejected);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
493 assert.spy(on_rejected).was_called(1);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
494 assert.spy(on_rejected).was_called_with(test_error);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
495 end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
496 end);
9456
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
497 end);