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spec/util_throttle_spec.lua

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spec/util_throttle_spec.lua @ 13742:47e537e340c4 default tip

Merge 13.0->trunk
author Matthew Wild <mwild1@gmail.com>
date Mon, 17 Feb 2025 23:06:26 +0000
parent 13399:f4415f76727b
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1
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2 -- luacheck: ignore 411/a
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3
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4 -- Mock util.time
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5 local now = 0; -- wibbly-wobbly... timey-wimey... stuff
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6 local function later(n)
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7 now = now + n; -- time passes at a different rate
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8 end
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9 package.loaded["util.time"] = {
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10 now = function() return now; end
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11 }
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14 local throttle = require "util.throttle";
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16 describe("util.throttle", function()
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17 describe("#create()", function()
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18 it("should be created with correct values", function()
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19 now = 5;
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20 local a = throttle.create(3, 10);
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21 assert.same(a, { balance = 3, max = 3, rate = 0.3, t = 5 });
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23 local a = throttle.create(3, 5);
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24 assert.same(a, { balance = 3, max = 3, rate = 0.6, t = 5 });
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26 local a = throttle.create(1, 1);
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27 assert.same(a, { balance = 1, max = 1, rate = 1, t = 5 });
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29 local a = throttle.create(10, 10);
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30 assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 });
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32 local a = throttle.create(10, 1);
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33 assert.same(a, { balance = 10, max = 10, rate = 10, t = 5 });
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34 end);
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35 end);
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37 describe("#update()", function()
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38 it("does nothing when no time has passed, even if balance is not full", function()
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39 now = 5;
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40 local a = throttle.create(10, 10);
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41 for i=1,5 do
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42 a:update();
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43 assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 });
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44 end
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45 a.balance = 0;
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46 for i=1,5 do
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47 a:update();
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48 assert.same(a, { balance = 0, max = 10, rate = 1, t = 5 });
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49 end
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50 end);
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51 it("updates only time when time passes but balance is full", function()
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52 now = 5;
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53 local a = throttle.create(10, 10);
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54 for i=1,5 do
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55 later(5);
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56 a:update();
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57 assert.same(a, { balance = 10, max = 10, rate = 1, t = 5 + i*5 });
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58 end
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59 end);
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60 it("updates balance when balance has room to grow as time passes", function()
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61 now = 5;
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62 local a = throttle.create(10, 10);
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63 a.balance = 0;
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64 assert.same(a, { balance = 0, max = 10, rate = 1, t = 5 });
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65
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66 later(1);
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67 a:update();
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68 assert.same(a, { balance = 1, max = 10, rate = 1, t = 6 });
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69
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70 later(3);
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71 a:update();
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72 assert.same(a, { balance = 4, max = 10, rate = 1, t = 9 });
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73
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74 later(10);
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75 a:update();
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76 assert.same(a, { balance = 10, max = 10, rate = 1, t = 19 });
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77 end);
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78 it("handles 10 x 0.1s updates the same as 1 x 1s update ", function()
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79 now = 5;
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80 local a = throttle.create(1, 1);
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81
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82 a.balance = 0;
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83 later(1);
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84 a:update();
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85 assert.same(a, { balance = 1, max = 1, rate = 1, t = now });
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86
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87 a.balance = 0;
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88 for i=1,10 do
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89 later(0.1);
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90 a:update();
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91 end
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92 assert(math.abs(a.balance - 1) < 0.0001); -- incremental updates cause rounding errors
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93 end);
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94 end);
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95
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96 -- describe("po")
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97
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98 describe("#poll()", function()
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99 it("should only allow successful polls until cost is hit", function()
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100 now = 5;
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101
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102 local a = throttle.create(3, 10);
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103 assert.same(a, { balance = 3, max = 3, rate = 0.3, t = 5 });
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104
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105 assert.is_true(a:poll(1)); -- 3 -> 2
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106 assert.same(a, { balance = 2, max = 3, rate = 0.3, t = 5 });
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107
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108 assert.is_true(a:poll(2)); -- 2 -> 1
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109 assert.same(a, { balance = 0, max = 3, rate = 0.3, t = 5 });
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110
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111 assert.is_false(a:poll(1)); -- MEEP, out of credits!
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112 assert.is_false(a:poll(1)); -- MEEP, out of credits!
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113 assert.same(a, { balance = 0, max = 3, rate = 0.3, t = 5 });
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114 end);
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115
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116 it("should not allow polls more than the cost", function()
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117 now = 0;
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118
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119 local a = throttle.create(10, 10);
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120 assert.same(a, { balance = 10, max = 10, rate = 1, t = 0 });
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121
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122 assert.is_false(a:poll(11));
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123 assert.same(a, { balance = 10, max = 10, rate = 1, t = 0 });
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124
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125 assert.is_true(a:poll(6));
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126 assert.same(a, { balance = 4, max = 10, rate = 1, t = 0 });
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127
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128 assert.is_false(a:poll(5));
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129 assert.same(a, { balance = 4, max = 10, rate = 1, t = 0 });
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130
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131 -- fractional
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132 assert.is_true(a:poll(3.5));
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133 assert.same(a, { balance = 0.5, max = 10, rate = 1, t = 0 });
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134
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135 assert.is_true(a:poll(0.25));
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136 assert.same(a, { balance = 0.25, max = 10, rate = 1, t = 0 });
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137
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138 assert.is_false(a:poll(0.3));
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139 assert.same(a, { balance = 0.25, max = 10, rate = 1, t = 0 });
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140
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141 assert.is_true(a:poll(0.25));
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142 assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });
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143
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144 assert.is_false(a:poll(0.1));
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145 assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });
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146
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147 assert.is_true(a:poll(0));
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148 assert.same(a, { balance = 0, max = 10, rate = 1, t = 0 });
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149 end);
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150 end);
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151 end);