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local dbuffer = require "util.dbuffer";
describe("util.dbuffer", function ()
describe("#new", function ()
it("has a constructor", function ()
assert.Function(dbuffer.new);
end);
it("can be created", function ()
assert.truthy(dbuffer.new());
end);
it("won't create an empty buffer", function ()
assert.falsy(dbuffer.new(0));
end);
it("won't create a negatively sized buffer", function ()
assert.falsy(dbuffer.new(-1));
end);
end);
describe(":write", function ()
local b = dbuffer.new();
it("works", function ()
assert.truthy(b:write("hi"));
end);
end);
describe(":read", function ()
it("supports optional bytes parameter", function ()
-- should return the frontmost chunk
local b = dbuffer.new();
assert.truthy(b:write("hello"));
assert.truthy(b:write(" "));
assert.truthy(b:write("world"));
assert.equal("h", b:read(1));
assert.equal("ello", b:read());
assert.equal(" ", b:read());
assert.equal("world", b:read());
end);
end);
describe(":discard", function ()
local b = dbuffer.new();
it("works", function ()
assert.truthy(b:write("hello world"));
assert.truthy(b:discard(6));
assert.equal(5, b:length());
assert.equal(5, b:len());
assert.equal("world", b:read(5));
end);
end);
describe(":collapse()", function ()
it("works on an empty buffer", function ()
local b = dbuffer.new();
b:collapse();
end);
end);
describe(":sub", function ()
-- Helper function to compare buffer:sub() with string:sub()
local s = "hello world";
local function test_sub(b, x, y)
local string_result, buffer_result = s:sub(x, y), b:sub(x, y);
assert.equals(string_result, buffer_result, ("buffer:sub(%d, %s) does not match string:sub()"):format(x, y and ("%d"):format(y) or "nil"));
end
it("works", function ()
local b = dbuffer.new();
assert.truthy(b:write("hello world"));
assert.equals("hello", b:sub(1, 5));
end);
it("works after discard", function ()
local b = dbuffer.new(256);
assert.truthy(b:write("foobar"));
assert.equals("foobar", b:sub(1, 6));
assert.truthy(b:discard(3)); -- consume "foo"
assert.equals("bar", b:sub(1, 3));
end);
it("supports optional end parameter", function ()
local b = dbuffer.new();
assert.truthy(b:write("hello world"));
assert.equals("hello world", b:sub(1));
assert.equals("world", b:sub(-5));
end);
it("is equivalent to string:sub", function ()
local b = dbuffer.new(11);
assert.truthy(b:write(s));
for i = -13, 13 do
for j = -13, 13 do
test_sub(b, i, j);
end
end
end);
end);
describe(":byte", function ()
-- Helper function to compare buffer:byte() with string:byte()
local s = "hello world"
local function test_byte(b, x, y)
local string_result, buffer_result = {s:byte(x, y)}, {b:byte(x, y)};
assert.same(string_result, buffer_result, ("buffer:byte(%d, %s) does not match string:byte()"):format(x, y and ("%d"):format(y) or "nil"));
end
it("is equivalent to string:byte", function ()
local b = dbuffer.new(11);
assert.truthy(b:write(s));
test_byte(b, 1);
test_byte(b, 3);
test_byte(b, -1);
test_byte(b, -3);
for i = -13, 13 do
for j = -13, 13 do
test_byte(b, i, j);
end
end
end);
it("works with characters > 127", function ()
local b = dbuffer.new();
b:write(string.char(0, 140));
local r = { b:byte(1, 2) };
assert.same({ 0, 140 }, r);
end);
it("works on an empty buffer", function ()
local b = dbuffer.new();
assert.equal("", b:sub(1,1));
end);
end);
end);
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