prosody
d7a403060946
spec/util_dbuffer_spec.lua

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spec/util_dbuffer_spec.lua @ 11028:d7a403060946

util.dbuffer: Fix traceback when :collapse() is called on empty buffer
author Matthew Wild <mwild1@gmail.com>
date Thu, 20 Aug 2020 15:22:19 +0100
parent 10980:eaee72c7afbd
child 11044:7b720a815519
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10973
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1 local dbuffer = require "util.dbuffer";
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2 describe("util.dbuffer", function ()
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3 describe("#new", function ()
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4 it("has a constructor", function ()
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5 assert.Function(dbuffer.new);
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6 end);
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7 it("can be created", function ()
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8 assert.truthy(dbuffer.new());
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9 end);
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10 it("won't create an empty buffer", function ()
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11 assert.falsy(dbuffer.new(0));
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12 end);
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13 it("won't create a negatively sized buffer", function ()
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14 assert.falsy(dbuffer.new(-1));
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15 end);
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16 end);
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17 describe(":write", function ()
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18 local b = dbuffer.new();
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19 it("works", function ()
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20 assert.truthy(b:write("hi"));
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21 end);
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22 end);
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23
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24 describe(":read", function ()
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25 it("supports optional bytes parameter", function ()
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26 -- should return the frontmost chunk
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27 local b = dbuffer.new();
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28 assert.truthy(b:write("hello"));
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29 assert.truthy(b:write(" "));
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30 assert.truthy(b:write("world"));
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31 assert.equal("h", b:read(1));
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32
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33 assert.equal("ello", b:read());
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34 assert.equal(" ", b:read());
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35 assert.equal("world", b:read());
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36 end);
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37 end);
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38
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39 describe(":discard", function ()
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40 local b = dbuffer.new();
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41 it("works", function ()
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42 assert.truthy(b:write("hello world"));
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43 assert.truthy(b:discard(6));
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44 assert.equal(5, b:length());
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45 assert.equal("world", b:read(5));
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46 end);
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47 end);
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48
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49 describe(":collapse()", function ()
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50 it("works on an empty buffer", function ()
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51 local b = dbuffer.new();
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52 b:collapse();
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53 end);
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54 end);
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55
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56 describe(":sub", function ()
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57 -- Helper function to compare buffer:sub() with string:sub()
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58 local s = "hello world";
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59 local function test_sub(b, x, y)
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60 local string_result, buffer_result = s:sub(x, y), b:sub(x, y);
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61 assert.equals(string_result, buffer_result, ("buffer:sub(%d, %s) does not match string:sub()"):format(x, y and ("%d"):format(y) or "nil"));
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62 end
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63
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64 it("works", function ()
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65 local b = dbuffer.new();
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66 assert.truthy(b:write("hello world"));
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67 assert.equals("hello", b:sub(1, 5));
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68 end);
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69
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70 it("supports optional end parameter", function ()
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71 local b = dbuffer.new();
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72 assert.truthy(b:write("hello world"));
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73 assert.equals("hello world", b:sub(1));
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74 assert.equals("world", b:sub(-5));
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75 end);
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76
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77 it("is equivalent to string:sub", function ()
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78 local b = dbuffer.new(11);
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79 assert.truthy(b:write(s));
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80 for i = -13, 13 do
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81 for j = -13, 13 do
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82 test_sub(b, i, j);
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83 end
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84 end
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85 end);
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86 end);
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87
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88 describe(":byte", function ()
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89 -- Helper function to compare buffer:byte() with string:byte()
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90 local s = "hello world"
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91 local function test_byte(b, x, y)
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92 local string_result, buffer_result = {s:byte(x, y)}, {b:byte(x, y)};
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93 assert.same(string_result, buffer_result, ("buffer:byte(%d, %s) does not match string:byte()"):format(x, y and ("%d"):format(y) or "nil"));
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94 end
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95
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96 it("is equivalent to string:byte", function ()
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97 local b = dbuffer.new(11);
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98 assert.truthy(b:write(s));
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99 test_byte(b, 1);
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100 test_byte(b, 3);
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101 test_byte(b, -1);
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102 test_byte(b, -3);
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103 for i = -13, 13 do
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104 for j = -13, 13 do
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105 test_byte(b, i, j);
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106 end
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107 end
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108 end);
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109
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110 it("works with characters > 127", function ()
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111 local b = dbuffer.new();
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112 b:write(string.char(0, 140));
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113 local r = { b:byte(1, 2) };
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114 assert.same({ 0, 140 }, r);
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115 end);
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116
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117 it("works on an empty buffer", function ()
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118 local b = dbuffer.new();
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119 assert.equal("", b:sub(1,1));
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120 end);
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121 end);
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122 end);