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d54a0e129af8
spec/util_promise_spec.lua

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spec/util_promise_spec.lua @ 9456:d54a0e129af8

util.promise: ES6-like API for promises
author Matthew Wild <mwild1@gmail.com>
date Wed, 10 Oct 2018 17:45:19 +0100
child 9457:d01cff2f7a26
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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 describe("new()", function ()
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5 it("returns a promise object", function ()
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6 assert(promise.new());
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7 end);
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8 end);
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9 it("notifies immediately for fulfilled promises", function ()
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10 local p = promise.new(function (resolve)
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11 resolve("foo");
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12 end);
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13 local cb = spy.new(function (v)
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14 assert.equal("foo", v);
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15 end);
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16 p:next(cb);
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17 assert.spy(cb).was_called(1);
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18 end);
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19 it("notifies on fulfilment of pending promises", function ()
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20 local r;
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21 local p = promise.new(function (resolve)
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22 r = resolve;
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23 end);
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24 local cb = spy.new(function (v)
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25 assert.equal("foo", v);
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26 end);
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27 p:next(cb);
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28 assert.spy(cb).was_called(0);
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29 r("foo");
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30 assert.spy(cb).was_called(1);
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31 end);
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32 it("allows chaining :next() calls", function ()
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33 local r;
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34 local result;
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35 local p = promise.new(function (resolve)
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36 r = resolve;
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37 end);
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38 local cb1 = spy.new(function (v)
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39 assert.equal("foo", v);
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40 return "bar";
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41 end);
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42 local cb2 = spy.new(function (v)
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43 assert.equal("bar", v);
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44 result = v;
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45 end);
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46 p:next(cb1):next(cb2);
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47 assert.spy(cb1).was_called(0);
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48 assert.spy(cb2).was_called(0);
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49 r("foo");
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50 assert.spy(cb1).was_called(1);
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51 assert.spy(cb2).was_called(1);
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52 assert.equal("bar", result);
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53 end);
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54 it("supports multiple :next() calls on the same promise", function ()
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55 local r;
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56 local result;
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57 local p = promise.new(function (resolve)
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58 r = resolve;
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59 end);
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60 local cb1 = spy.new(function (v)
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61 assert.equal("foo", v);
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62 result = v;
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63 end);
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64 local cb2 = spy.new(function (v)
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65 assert.equal("foo", v);
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66 result = v;
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67 end);
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68 p:next(cb1);
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69 p:next(cb2);
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70 assert.spy(cb1).was_called(0);
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71 assert.spy(cb2).was_called(0);
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72 r("foo");
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73 assert.spy(cb1).was_called(1);
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74 assert.spy(cb2).was_called(1);
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75 assert.equal("foo", result);
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76 end);
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77 it("automatically rejects on error", function ()
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78 local r;
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79 local p = promise.new(function (resolve)
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80 r = resolve;
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81 error("oh no");
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82 end);
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83 local cb = spy.new(function () end);
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84 local err_cb = spy.new(function (v)
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85 assert.equal("oh no", v);
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86 end);
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87 p:next(cb, err_cb);
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88 assert.spy(cb).was_called(0);
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89 assert.spy(err_cb).was_called(1);
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90 r("foo");
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91 assert.spy(cb).was_called(0);
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92 assert.spy(err_cb).was_called(1);
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93 end);
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94 it("supports reject()", function ()
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95 local r, result;
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96 local p = promise.new(function (resolve, reject)
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97 r = reject;
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98 end);
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99 local cb = spy.new(function () end);
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100 local err_cb = spy.new(function (v)
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101 result = v;
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102 assert.equal("oh doh", v);
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103 end);
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104 p:next(cb, err_cb);
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105 assert.spy(cb).was_called(0);
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106 assert.spy(err_cb).was_called(0);
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107 r("oh doh");
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108 assert.spy(cb).was_called(0);
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109 assert.spy(err_cb).was_called(1);
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110 assert.equal("oh doh", result);
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111 end);
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112 it("supports chaining of rejected promises", function ()
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113 local r, result;
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114 local p = promise.new(function (resolve, reject)
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115 r = reject;
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116 end);
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117 local cb = spy.new(function () end);
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118 local err_cb = spy.new(function (v)
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119 result = v;
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120 assert.equal("oh doh", v);
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121 return "ok"
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122 end);
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123 local cb2 = spy.new(function (v)
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124 result = v;
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125 end);
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126 local err_cb2 = spy.new(function (v) end);
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127 p:next(cb, err_cb):next(cb2, err_cb2)
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128 assert.spy(cb).was_called(0);
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129 assert.spy(err_cb).was_called(0);
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130 assert.spy(cb2).was_called(0);
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131 assert.spy(err_cb2).was_called(0);
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132 r("oh doh");
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133 assert.spy(cb).was_called(0);
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134 assert.spy(err_cb).was_called(1);
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135 assert.spy(cb2).was_called(1);
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136 assert.spy(err_cb2).was_called(0);
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137 assert.equal("ok", result);
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138 end);
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139
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140 describe("race()", function ()
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141 it("works with fulfilled promises", function ()
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142 local p1, p2 = promise.resolve("yep"), promise.resolve("nope");
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143 local p = promise.race({ p1, p2 });
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144 local result;
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145 p:next(function (v)
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146 result = v;
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147 end);
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148 assert.equal("yep", result);
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149 end);
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150 it("works with pending promises", function ()
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151 local r1, r2;
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152 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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153 local p = promise.race({ p1, p2 });
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154
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155 local result;
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156 local cb = spy.new(function (v)
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157 result = v;
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158 end);
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159 p:next(cb);
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160 assert.spy(cb).was_called(0);
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161 r2("yep");
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162 r1("nope");
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163 assert.spy(cb).was_called(1);
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164 assert.equal("yep", result);
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165 end);
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166 end);
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167 describe("all()", function ()
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168 it("works with fulfilled promises", function ()
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169 local p1, p2 = promise.resolve("yep"), promise.resolve("nope");
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170 local p = promise.all({ p1, p2 });
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171 local result;
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172 p:next(function (v)
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173 result = v;
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174 end);
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175 assert.same({ "yep", "nope" }, result);
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176 end);
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177 it("works with pending promises", function ()
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178 local r1, r2;
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179 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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180 local p = promise.all({ p1, p2 });
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181
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182 local result;
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183 local cb = spy.new(function (v)
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184 result = v;
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185 end);
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186 p:next(cb);
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187 assert.spy(cb).was_called(0);
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188 r2("yep");
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189 assert.spy(cb).was_called(0);
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190 r1("nope");
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191 assert.spy(cb).was_called(1);
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192 assert.same({ "nope", "yep" }, result);
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193 end);
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194 it("rejects if any promise rejects", function ()
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195 local r1, r2;
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196 local p1 = promise.new(function (resolve, reject) r1 = reject end);
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197 local p2 = promise.new(function (resolve, reject) r2 = reject end);
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198 local p = promise.all({ p1, p2 });
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199
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200 local result;
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201 local cb = spy.new(function (v)
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202 result = v;
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203 end);
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204 local cb_err = spy.new(function (v)
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205 result = v;
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206 end);
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207 p:next(cb, cb_err);
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208 assert.spy(cb).was_called(0);
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209 assert.spy(cb_err).was_called(0);
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210 r2("fail");
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211 assert.spy(cb).was_called(0);
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212 assert.spy(cb_err).was_called(1);
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213 r1("nope");
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214 assert.spy(cb).was_called(0);
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215 assert.spy(cb_err).was_called(1);
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216 assert.equal("fail", result);
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217 end);
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218 end);
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219 describe("catch()", function ()
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220 it("works", function ()
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221 local result;
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222 local p = promise.new(function (resolve)
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223 error({ foo = true });
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224 end);
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225 local cb1 = spy.new(function (v)
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226 result = v;
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227 end);
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228 assert.spy(cb1).was_called(0);
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229 p:catch(cb1);
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230 assert.spy(cb1).was_called(1);
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231 assert.same({ foo = true }, result);
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232 end);
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233 end);
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234 it("promises may be resolved by other promises", function ()
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235 local r1, r2;
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236 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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237
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238 local result;
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239 local cb = spy.new(function (v)
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240 result = v;
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241 end);
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242 p1:next(cb);
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243 assert.spy(cb).was_called(0);
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244
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245 r1(p2);
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246 assert.spy(cb).was_called(0);
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247 r2("yep");
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248 assert.spy(cb).was_called(1);
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249 assert.equal("yep", result);
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250 end);
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251 describe("reject()", function ()
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252 it("returns a rejected promise", function ()
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253 local p = promise.reject("foo");
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254 local cb = spy.new(function (v)
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255 result = v;
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256 end);
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257 p:next(cb);
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258 assert.spy(cb).was_called(1);
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259 assert.spy(cb).was_called_with("foo");
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260 end);
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parents:
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261 end);
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parents:
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262 end);