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b1c6ede17592
spec/util_promise_spec.lua

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spec/util_promise_spec.lua @ 9517:b1c6ede17592

util.promise: Add promise.try()
author Matthew Wild <mwild1@gmail.com>
date Thu, 18 Oct 2018 18:03:31 +0100
parent 9514:9db707a86a25
child 9549:800c274928bf
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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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256 p:catch(cb);
9456
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257 assert.spy(cb).was_called(1);
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258 assert.spy(cb).was_called_with("foo");
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259 end);
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260 it("returns a rejected promise and does not call on_fulfilled", function ()
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261 local p = promise.reject("foo");
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262 local cb = spy.new(function () end);
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diff changeset
263 p:next(cb);
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264 assert.spy(cb).was_called(0);
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parents: 9510
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265 end);
9456
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266 end);
9514
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267 describe("finally()", function ()
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268 local p, p2, resolve, reject, on_finally;
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diff changeset
269 before_each(function ()
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270 p = promise.new(function (_resolve, _reject)
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271 resolve, reject = _resolve, _reject;
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272 end);
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273 on_finally = spy.new(function () end);
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274 p2 = p:finally(on_finally);
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275 end);
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276 it("runs when a promise is resolved", function ()
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277 assert.spy(on_finally).was_called(0);
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278 resolve("foo");
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279 assert.spy(on_finally).was_called(1);
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280 assert.spy(on_finally).was_not_called_with("foo");
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281 end);
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282 it("runs when a promise is rejected", function ()
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283 assert.spy(on_finally).was_called(0);
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284 reject("foo");
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285 assert.spy(on_finally).was_called(1);
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286 assert.spy(on_finally).was_not_called_with("foo");
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287 end);
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288 it("returns a promise that fulfills with the original value", function ()
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289 local cb2 = spy.new(function () end);
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290 p2:next(cb2);
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291 assert.spy(on_finally).was_called(0);
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292 assert.spy(cb2).was_called(0);
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293 resolve("foo");
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294 assert.spy(on_finally).was_called(1);
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295 assert.spy(cb2).was_called(1);
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296 assert.spy(on_finally).was_not_called_with("foo");
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297 assert.spy(cb2).was_called_with("foo");
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298 end);
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299 it("returns a promise that rejects with the original error", function ()
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300 local on_finally_err = spy.new(function () end);
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301 local on_finally_ok = spy.new(function () end);
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302 p2:catch(on_finally_err);
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303 p2:next(on_finally_ok);
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304 assert.spy(on_finally).was_called(0);
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305 assert.spy(on_finally_err).was_called(0);
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306 reject("foo");
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307 assert.spy(on_finally).was_called(1);
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308 -- Since the original promise was rejected, the finally promise should also be
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309 assert.spy(on_finally_ok).was_called(0);
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310 assert.spy(on_finally_err).was_called(1);
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311 assert.spy(on_finally).was_not_called_with("foo");
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312 assert.spy(on_finally_err).was_called_with("foo");
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313 end);
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314 it("returns a promise that rejects with an uncaught error inside on_finally", function ()
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315 p = promise.new(function (_resolve, _reject)
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316 resolve, reject = _resolve, _reject;
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317 end);
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318 local test_error = {};
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319 on_finally = spy.new(function () error(test_error) end);
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320 p2 = p:finally(on_finally);
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321
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322 local on_finally_err = spy.new(function () end);
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323 p2:catch(on_finally_err);
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324 assert.spy(on_finally).was_called(0);
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325 assert.spy(on_finally_err).was_called(0);
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326 reject("foo");
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327 assert.spy(on_finally).was_called(1);
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328 assert.spy(on_finally_err).was_called(1);
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329 assert.spy(on_finally).was_not_called_with("foo");
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330 assert.spy(on_finally).was_not_called_with(test_error);
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331 assert.spy(on_finally_err).was_called_with(test_error);
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332 end);
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333 end);
9517
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334 describe("try()", function ()
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335 it("works with functions that return a promise", function ()
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336 local resolve;
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337 local p = promise.try(function ()
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338 return promise.new(function (_resolve)
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339 resolve = _resolve;
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340 end);
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341 end);
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342 assert.is_function(resolve);
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343 local on_resolved = spy.new(function () end);
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344 p:next(on_resolved);
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345 assert.spy(on_resolved).was_not_called();
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346 resolve("foo");
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347 assert.spy(on_resolved).was_called_with("foo");
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348 end);
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349
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350 it("works with functions that return a value", function ()
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351 local p = promise.try(function ()
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352 return "foo";
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353 end);
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354 local on_resolved = spy.new(function () end);
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355 p:next(on_resolved);
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356 assert.spy(on_resolved).was_called_with("foo");
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357 end);
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358
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359 it("works with functions that return a promise that rejects", function ()
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360 local reject;
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361 local p = promise.try(function ()
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362 return promise.new(function (_, _reject)
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363 reject = _reject;
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364 end);
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365 end);
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366 assert.is_function(reject);
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367 local on_rejected = spy.new(function () end);
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368 p:catch(on_rejected);
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diff changeset
369 assert.spy(on_rejected).was_not_called();
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370 reject("foo");
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371 assert.spy(on_rejected).was_called_with("foo");
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372 end);
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373
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374 it("works with functions that throw errors", function ()
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375 local test_error = {};
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376 local p = promise.try(function ()
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377 error(test_error);
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378 end);
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379 local on_rejected = spy.new(function () end);
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380 p:catch(on_rejected);
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381 assert.spy(on_rejected).was_called(1);
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382 assert.spy(on_rejected).was_called_with(test_error);
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383 end);
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384 end);
9456
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385 end);