prosody
e54b8a5e35ad
spec/util_ringbuffer_spec.lua

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spec/util_ringbuffer_spec.lua @ 12446:e54b8a5e35ad 0.12

util.random: Test whether util.crand works before using it (fix #1734) util.crand can be configured at compile time to use the Linux getrandom() system call, available from Linux 3.17, but it is still possible to load it with an older kernel lacking that system call, where attempting to use it throws an ENOSYS error. By testing for this on load we can fall back to /dev/urandom in this case.
author Kim Alvefur <zash@zash.se>
date Sat, 02 Apr 2022 16:33:27 +0200
parent 10960:f84e0e2faae2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
10897
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1 local rb = require "util.ringbuffer";
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2 describe("util.ringbuffer", 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(rb.new);
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6 end);
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7 it("can be created", function ()
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8 assert.truthy(rb.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.has_error(function ()
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12 rb.new(0);
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13 end);
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14 end);
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15 it("won't create a negatively sized buffer", function ()
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16 assert.has_error(function ()
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17 rb.new(-1);
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18 end);
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19 end);
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20 end);
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21 describe(":write", function ()
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22 local b = rb.new();
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23 it("works", function ()
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24 assert.truthy(b:write("hi"));
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25 end);
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26 end);
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27
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28 describe(":discard", function ()
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29 local b = rb.new();
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30 it("works", function ()
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31 assert.truthy(b:write("hello world"));
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32 assert.truthy(b:discard(6));
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33 assert.equal(5, #b);
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34 assert.equal("world", b:read(5));
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35 end);
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36 end);
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37
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38 describe(":sub", function ()
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39 -- Helper function to compare buffer:sub() with string:sub()
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40 local function test_sub(b, x, y)
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41 local s = b:read(#b, true);
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42 local string_result, buffer_result = s:sub(x, y), b:sub(x, y);
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43 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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44 end
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45
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46 it("works", function ()
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47 local b = rb.new();
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48 assert.truthy(b:write("hello world"));
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49 assert.equals("hello", b:sub(1, 5));
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50 end);
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51
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52 it("supports optional end parameter", function ()
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53 local b = rb.new();
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54 assert.truthy(b:write("hello world"));
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55 assert.equals("hello world", b:sub(1));
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56 assert.equals("world", b:sub(-5));
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57 end);
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58
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59 it("is equivalent to string:sub", function ()
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60 local b = rb.new(6);
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61 assert.truthy(b:write("foobar"));
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62 b:read(3);
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63 b:write("foo");
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64 for i = -13, 13 do
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65 for j = -13, 13 do
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66 test_sub(b, i, j);
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67 end
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68 end
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69 end);
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70 end);
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71
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72 describe(":byte", function ()
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73 -- Helper function to compare buffer:byte() with string:byte()
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74 local function test_byte(b, x, y)
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75 local s = b:read(#b, true);
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76 local string_result, buffer_result = {s:byte(x, y)}, {b:byte(x, y)};
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77 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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78 end
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79
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80 it("is equivalent to string:byte", function ()
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81 local b = rb.new(6);
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82 assert.truthy(b:write("foobar"));
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83 b:read(3);
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84 b:write("foo");
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85 test_byte(b, 1);
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86 test_byte(b, 3);
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87 test_byte(b, -1);
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88 test_byte(b, -3);
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89 for i = -13, 13 do
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90 for j = -13, 13 do
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91 test_byte(b, i, j);
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92 end
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93 end
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94 end);
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95
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96 it("works with characters > 127", function ()
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97 local b = rb.new();
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98 b:write(string.char(0, 140));
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99 local r = { b:byte(1, 2) };
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100 assert.same({ 0, 140 }, r);
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101 end);
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102 end);
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103 end);