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800c274928bf
spec/util_promise_spec.lua

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spec/util_promise_spec.lua @ 9549:800c274928bf

util.promise: Ensure chained promises always receive a value/rejection even if an intermediate promise has no handlers
author Matthew Wild <mwild1@gmail.com>
date Thu, 25 Oct 2018 14:38:00 +0100
parent 9517:b1c6ede17592
child 9550:98de4c2e2627
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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 = resolve;
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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.equal(test_error, result);
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158 end);
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159
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160 it("propagates values down the chain, even when some handlers are not provided", function ()
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161 local r;
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162 local p = promise.new(function (resolve, reject)
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163 r = resolve;
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164 end);
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165 local cb = spy.new(function () end);
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166 local err_cb = spy.new(function () end);
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167 local p2 = p:next(function (v) return v; end);
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168 local p3 = p2:catch(err_cb)
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169 p3:next(cb);
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170 assert.spy(cb).was_called(0);
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171 assert.spy(err_cb).was_called(0);
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172 r(1337);
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173 assert.spy(cb).was_called(1);
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174 assert.spy(cb).was_called_with(1337);
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175 assert.spy(err_cb).was_called(0);
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176 end);
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177
9456
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178 describe("race()", function ()
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179 it("works with fulfilled promises", function ()
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180 local p1, p2 = promise.resolve("yep"), promise.resolve("nope");
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181 local p = promise.race({ p1, p2 });
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182 local result;
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183 p:next(function (v)
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184 result = v;
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185 end);
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186 assert.equal("yep", result);
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187 end);
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188 it("works with pending promises", function ()
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189 local r1, r2;
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190 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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191 local p = promise.race({ p1, p2 });
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192
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193 local result;
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194 local cb = spy.new(function (v)
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195 result = v;
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196 end);
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197 p:next(cb);
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198 assert.spy(cb).was_called(0);
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199 r2("yep");
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200 r1("nope");
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201 assert.spy(cb).was_called(1);
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202 assert.equal("yep", result);
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203 end);
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204 end);
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205 describe("all()", function ()
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206 it("works with fulfilled promises", function ()
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207 local p1, p2 = promise.resolve("yep"), promise.resolve("nope");
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208 local p = promise.all({ p1, p2 });
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209 local result;
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210 p:next(function (v)
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211 result = v;
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212 end);
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213 assert.same({ "yep", "nope" }, result);
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214 end);
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215 it("works with pending promises", function ()
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216 local r1, r2;
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217 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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218 local p = promise.all({ p1, p2 });
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219
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220 local result;
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221 local cb = spy.new(function (v)
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222 result = v;
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223 end);
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224 p:next(cb);
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225 assert.spy(cb).was_called(0);
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226 r2("yep");
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227 assert.spy(cb).was_called(0);
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228 r1("nope");
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229 assert.spy(cb).was_called(1);
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230 assert.same({ "nope", "yep" }, result);
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231 end);
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232 it("rejects if any promise rejects", function ()
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233 local r1, r2;
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234 local p1 = promise.new(function (resolve, reject) r1 = reject end);
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235 local p2 = promise.new(function (resolve, reject) r2 = reject end);
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236 local p = promise.all({ p1, p2 });
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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 local cb_err = spy.new(function (v)
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243 result = v;
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244 end);
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245 p:next(cb, cb_err);
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246 assert.spy(cb).was_called(0);
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247 assert.spy(cb_err).was_called(0);
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248 r2("fail");
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249 assert.spy(cb).was_called(0);
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250 assert.spy(cb_err).was_called(1);
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251 r1("nope");
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252 assert.spy(cb).was_called(0);
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253 assert.spy(cb_err).was_called(1);
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254 assert.equal("fail", result);
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255 end);
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256 end);
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257 describe("catch()", function ()
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258 it("works", function ()
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259 local result;
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260 local p = promise.new(function (resolve)
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261 error({ foo = true });
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262 end);
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263 local cb1 = spy.new(function (v)
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264 result = v;
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265 end);
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266 assert.spy(cb1).was_called(0);
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267 p:catch(cb1);
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268 assert.spy(cb1).was_called(1);
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269 assert.same({ foo = true }, result);
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270 end);
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271 end);
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272 it("promises may be resolved by other promises", function ()
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273 local r1, r2;
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274 local p1, p2 = promise.new(function (resolve) r1 = resolve end), promise.new(function (resolve) r2 = resolve end);
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275
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276 local result;
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277 local cb = spy.new(function (v)
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278 result = v;
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279 end);
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280 p1:next(cb);
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281 assert.spy(cb).was_called(0);
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282
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283 r1(p2);
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284 assert.spy(cb).was_called(0);
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diff changeset
285 r2("yep");
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286 assert.spy(cb).was_called(1);
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diff changeset
287 assert.equal("yep", result);
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288 end);
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289 describe("reject()", function ()
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290 it("returns a rejected promise", function ()
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291 local p = promise.reject("foo");
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292 local cb = spy.new(function () end);
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293 p:catch(cb);
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294 assert.spy(cb).was_called(1);
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295 assert.spy(cb).was_called_with("foo");
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296 end);
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297 it("returns a rejected promise and does not call on_fulfilled", function ()
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298 local p = promise.reject("foo");
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299 local cb = spy.new(function () end);
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300 p:next(cb);
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301 assert.spy(cb).was_called(0);
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302 end);
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303 end);
9514
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304 describe("finally()", function ()
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305 local p, p2, resolve, reject, on_finally;
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306 before_each(function ()
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307 p = promise.new(function (_resolve, _reject)
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308 resolve, reject = _resolve, _reject;
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309 end);
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310 on_finally = spy.new(function () end);
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311 p2 = p:finally(on_finally);
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312 end);
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313 it("runs when a promise is resolved", function ()
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314 assert.spy(on_finally).was_called(0);
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315 resolve("foo");
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316 assert.spy(on_finally).was_called(1);
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317 assert.spy(on_finally).was_not_called_with("foo");
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318 end);
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319 it("runs when a promise is rejected", function ()
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320 assert.spy(on_finally).was_called(0);
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321 reject("foo");
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322 assert.spy(on_finally).was_called(1);
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323 assert.spy(on_finally).was_not_called_with("foo");
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324 end);
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325 it("returns a promise that fulfills with the original value", function ()
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326 local cb2 = spy.new(function () end);
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327 p2:next(cb2);
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328 assert.spy(on_finally).was_called(0);
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329 assert.spy(cb2).was_called(0);
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330 resolve("foo");
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331 assert.spy(on_finally).was_called(1);
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332 assert.spy(cb2).was_called(1);
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diff changeset
333 assert.spy(on_finally).was_not_called_with("foo");
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334 assert.spy(cb2).was_called_with("foo");
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335 end);
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336 it("returns a promise that rejects with the original error", function ()
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337 local on_finally_err = spy.new(function () end);
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338 local on_finally_ok = spy.new(function () end);
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339 p2:catch(on_finally_err);
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340 p2:next(on_finally_ok);
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341 assert.spy(on_finally).was_called(0);
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342 assert.spy(on_finally_err).was_called(0);
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343 reject("foo");
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344 assert.spy(on_finally).was_called(1);
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345 -- Since the original promise was rejected, the finally promise should also be
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346 assert.spy(on_finally_ok).was_called(0);
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347 assert.spy(on_finally_err).was_called(1);
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348 assert.spy(on_finally).was_not_called_with("foo");
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349 assert.spy(on_finally_err).was_called_with("foo");
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350 end);
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351 it("returns a promise that rejects with an uncaught error inside on_finally", function ()
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352 p = promise.new(function (_resolve, _reject)
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353 resolve, reject = _resolve, _reject;
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354 end);
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355 local test_error = {};
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356 on_finally = spy.new(function () error(test_error) end);
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357 p2 = p:finally(on_finally);
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358
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359 local on_finally_err = spy.new(function () end);
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360 p2:catch(on_finally_err);
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361 assert.spy(on_finally).was_called(0);
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diff changeset
362 assert.spy(on_finally_err).was_called(0);
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diff changeset
363 reject("foo");
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parents: 9511
diff changeset
364 assert.spy(on_finally).was_called(1);
9db707a86a25 util.promise: Add promise:finally()
Matthew Wild <mwild1@gmail.com>
parents: 9511
diff changeset
365 assert.spy(on_finally_err).was_called(1);
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parents: 9511
diff changeset
366 assert.spy(on_finally).was_not_called_with("foo");
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parents: 9511
diff changeset
367 assert.spy(on_finally).was_not_called_with(test_error);
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parents: 9511
diff changeset
368 assert.spy(on_finally_err).was_called_with(test_error);
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diff changeset
369 end);
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diff changeset
370 end);
9517
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diff changeset
371 describe("try()", function ()
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diff changeset
372 it("works with functions that return a promise", function ()
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373 local resolve;
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374 local p = promise.try(function ()
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375 return promise.new(function (_resolve)
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376 resolve = _resolve;
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377 end);
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378 end);
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379 assert.is_function(resolve);
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380 local on_resolved = spy.new(function () end);
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381 p:next(on_resolved);
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Matthew Wild <mwild1@gmail.com>
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382 assert.spy(on_resolved).was_not_called();
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diff changeset
383 resolve("foo");
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parents: 9514
diff changeset
384 assert.spy(on_resolved).was_called_with("foo");
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385 end);
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386
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parents: 9514
diff changeset
387 it("works with functions that return a value", function ()
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diff changeset
388 local p = promise.try(function ()
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parents: 9514
diff changeset
389 return "foo";
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parents: 9514
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390 end);
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391 local on_resolved = spy.new(function () end);
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diff changeset
392 p:next(on_resolved);
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parents: 9514
diff changeset
393 assert.spy(on_resolved).was_called_with("foo");
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394 end);
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Matthew Wild <mwild1@gmail.com>
parents: 9514
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395
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parents: 9514
diff changeset
396 it("works with functions that return a promise that rejects", function ()
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
397 local reject;
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parents: 9514
diff changeset
398 local p = promise.try(function ()
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parents: 9514
diff changeset
399 return promise.new(function (_, _reject)
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parents: 9514
diff changeset
400 reject = _reject;
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parents: 9514
diff changeset
401 end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
402 end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
403 assert.is_function(reject);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
404 local on_rejected = spy.new(function () end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
405 p:catch(on_rejected);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
406 assert.spy(on_rejected).was_not_called();
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
407 reject("foo");
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
408 assert.spy(on_rejected).was_called_with("foo");
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
409 end);
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
410
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
411 it("works with functions that throw errors", function ()
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
412 local test_error = {};
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
413 local p = promise.try(function ()
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
414 error(test_error);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
415 end);
b1c6ede17592 util.promise: Add promise.try()
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parents: 9514
diff changeset
416 local on_rejected = spy.new(function () end);
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
417 p:catch(on_rejected);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
418 assert.spy(on_rejected).was_called(1);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
419 assert.spy(on_rejected).was_called_with(test_error);
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Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
420 end);
b1c6ede17592 util.promise: Add promise.try()
Matthew Wild <mwild1@gmail.com>
parents: 9514
diff changeset
421 end);
9456
d54a0e129af8 util.promise: ES6-like API for promises
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parents:
diff changeset
422 end);