author | Matthew Wild <mwild1@gmail.com> |
Thu, 25 Oct 2018 14:38:00 +0100 | |
changeset 9552 | 800c274928bf |
parent 9520 | b1c6ede17592 |
child 9553 | 98de4c2e2627 |
permissions | -rw-r--r-- |
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util.promise: ES6-like API for promises
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1 |
local promise = require "util.promise"; |
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describe("util.promise", function () |
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--luacheck: ignore 212/resolve 212/reject |
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describe("new()", function () |
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it("returns a promise object", function () |
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assert(promise.new()); |
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end); |
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end); |
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it("notifies immediately for fulfilled promises", function () |
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local p = promise.new(function (resolve) |
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resolve("foo"); |
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end); |
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local cb = spy.new(function (v) |
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assert.equal("foo", v); |
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end); |
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p:next(cb); |
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assert.spy(cb).was_called(1); |
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end); |
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it("notifies on fulfilment of pending promises", function () |
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local r; |
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local p = promise.new(function (resolve) |
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r = resolve; |
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end); |
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local cb = spy.new(function (v) |
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assert.equal("foo", v); |
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end); |
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p:next(cb); |
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assert.spy(cb).was_called(0); |
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r("foo"); |
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assert.spy(cb).was_called(1); |
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end); |
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it("allows chaining :next() calls", function () |
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local r; |
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local result; |
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local p = promise.new(function (resolve) |
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r = resolve; |
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end); |
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local cb1 = spy.new(function (v) |
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assert.equal("foo", v); |
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return "bar"; |
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end); |
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local cb2 = spy.new(function (v) |
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assert.equal("bar", v); |
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result = v; |
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end); |
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p:next(cb1):next(cb2); |
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assert.spy(cb1).was_called(0); |
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assert.spy(cb2).was_called(0); |
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r("foo"); |
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assert.spy(cb1).was_called(1); |
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assert.spy(cb2).was_called(1); |
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assert.equal("bar", result); |
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end); |
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it("supports multiple :next() calls on the same promise", function () |
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local r; |
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local result; |
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local p = promise.new(function (resolve) |
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r = resolve; |
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end); |
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local cb1 = spy.new(function (v) |
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assert.equal("foo", v); |
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result = v; |
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end); |
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local cb2 = spy.new(function (v) |
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assert.equal("foo", v); |
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result = v; |
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end); |
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p:next(cb1); |
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p:next(cb2); |
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assert.spy(cb1).was_called(0); |
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assert.spy(cb2).was_called(0); |
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r("foo"); |
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assert.spy(cb1).was_called(1); |
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assert.spy(cb2).was_called(1); |
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assert.equal("foo", result); |
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end); |
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it("automatically rejects on error", function () |
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local r; |
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local p = promise.new(function (resolve) |
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r = resolve; |
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error("oh no"); |
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end); |
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local cb = spy.new(function () end); |
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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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p:next(cb, err_cb); |
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89 |
assert.spy(cb).was_called(0); |
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assert.spy(err_cb).was_called(1); |
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r("foo"); |
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assert.spy(cb).was_called(0); |
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assert.spy(err_cb).was_called(1); |
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end); |
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it("supports reject()", function () |
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local r, result; |
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97 |
local p = promise.new(function (resolve, reject) |
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r = reject; |
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99 |
end); |
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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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local r, result; |
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local p = promise.new(function (resolve, reject) |
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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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local cb2 = spy.new(function (v) |
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result = v; |
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end); |
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local err_cb2 = spy.new(function () end); |
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p:next(cb, err_cb):next(cb2, err_cb2) |
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assert.spy(cb).was_called(0); |
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assert.spy(err_cb).was_called(0); |
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assert.spy(cb2).was_called(0); |
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assert.spy(err_cb2).was_called(0); |
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133 |
r("oh doh"); |
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assert.spy(cb).was_called(0); |
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assert.spy(err_cb).was_called(1); |
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136 |
assert.spy(cb2).was_called(1); |
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assert.spy(err_cb2).was_called(0); |
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assert.equal("ok", result); |
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139 |
end); |
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140 |
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it("propagates errors down the chain, even when some handlers are not provided", function () |
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local r, result; |
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local test_error = {}; |
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144 |
local p = promise.new(function (resolve, reject) |
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r = resolve; |
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146 |
end); |
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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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local p3 = p2:next(cb) |
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p3:catch(err_cb); |
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assert.spy(cb).was_called(0); |
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assert.spy(err_cb).was_called(0); |
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154 |
r("oh doh"); |
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assert.spy(cb).was_called(0); |
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assert.spy(err_cb).was_called(1); |
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assert.equal(test_error, result); |
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158 |
end); |
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159 |
|
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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 |
|
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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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local p = promise.all({ p1, p2 }); |
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237 |
|
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local result; |
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239 |
local cb = spy.new(function (v) |
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result = v; |
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241 |
end); |
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242 |
local cb_err = spy.new(function (v) |
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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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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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285 |
r2("yep"); |
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286 |
assert.spy(cb).was_called(1); |
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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); |
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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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|
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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362 |
assert.spy(on_finally_err).was_called(0); |
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363 |
reject("foo"); |
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364 |
assert.spy(on_finally).was_called(1); |
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365 |
assert.spy(on_finally_err).was_called(1); |
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366 |
assert.spy(on_finally).was_not_called_with("foo"); |
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367 |
assert.spy(on_finally).was_not_called_with(test_error); |
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368 |
assert.spy(on_finally_err).was_called_with(test_error); |
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369 |
end); |
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370 |
end); |
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371 |
describe("try()", function () |
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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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382 |
assert.spy(on_resolved).was_not_called(); |
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383 |
resolve("foo"); |
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384 |
assert.spy(on_resolved).was_called_with("foo"); |
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385 |
end); |
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386 |
|
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387 |
it("works with functions that return a value", function () |
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388 |
local p = promise.try(function () |
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389 |
return "foo"; |
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390 |
end); |
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391 |
local on_resolved = spy.new(function () end); |
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392 |
p:next(on_resolved); |
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393 |
assert.spy(on_resolved).was_called_with("foo"); |
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394 |
end); |
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395 |
|
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396 |
it("works with functions that return a promise that rejects", function () |
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397 |
local reject; |
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398 |
local p = promise.try(function () |
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|
399 |
return promise.new(function (_, _reject) |
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400 |
reject = _reject; |
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|
401 |
end); |
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|
402 |
end); |
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403 |
assert.is_function(reject); |
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|
404 |
local on_rejected = spy.new(function () end); |
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405 |
p:catch(on_rejected); |
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|
406 |
assert.spy(on_rejected).was_not_called(); |
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|
407 |
reject("foo"); |
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408 |
assert.spy(on_rejected).was_called_with("foo"); |
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|
409 |
end); |
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|
410 |
|
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411 |
it("works with functions that throw errors", function () |
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|
412 |
local test_error = {}; |
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|
413 |
local p = promise.try(function () |
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|
414 |
error(test_error); |
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|
415 |
end); |
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416 |
local on_rejected = spy.new(function () end); |
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417 |
p:catch(on_rejected); |
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|
418 |
assert.spy(on_rejected).was_called(1); |
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419 |
assert.spy(on_rejected).was_called_with(test_error); |
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|
420 |
end); |
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421 |
end); |
9459
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422 |
end); |