author | Kim Alvefur <zash@zash.se> |
Tue, 22 Nov 2022 23:56:01 +0100 | |
branch | 0.11 |
changeset 12801 | be09ac8300a7 |
parent 11160 | a8ef69f7fc35 |
child 11162 | 3a72cb126d6c |
permissions | -rw-r--r-- |
11109 | 1 |
local dbuffer = require "util.dbuffer"; |
2 |
describe("util.dbuffer", function () |
|
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describe("#new", function () |
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it("has a constructor", function () |
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assert.Function(dbuffer.new); |
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end); |
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it("can be created", function () |
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assert.truthy(dbuffer.new()); |
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end); |
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it("won't create an empty buffer", function () |
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assert.falsy(dbuffer.new(0)); |
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end); |
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it("won't create a negatively sized buffer", function () |
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assert.falsy(dbuffer.new(-1)); |
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end); |
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end); |
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describe(":write", function () |
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local b = dbuffer.new(); |
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it("works", function () |
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assert.truthy(b:write("hi")); |
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end); |
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end); |
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||
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describe(":read", function () |
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it("supports optional bytes parameter", function () |
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-- should return the frontmost chunk |
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local b = dbuffer.new(); |
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assert.truthy(b:write("hello")); |
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assert.truthy(b:write(" ")); |
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assert.truthy(b:write("world")); |
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assert.equal("h", b:read(1)); |
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||
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assert.equal("ello", b:read()); |
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assert.equal(" ", b:read()); |
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assert.equal("world", b:read()); |
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end); |
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end); |
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||
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describe(":discard", function () |
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local b = dbuffer.new(); |
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it("works", function () |
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assert.truthy(b:write("hello world")); |
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assert.truthy(b:discard(6)); |
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assert.equal(5, b:length()); |
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11160
a8ef69f7fc35
util.dbuffer: Expose length as :len() method, like strings
Kim Alvefur <zash@zash.se>
parents:
11109
diff
changeset
|
45 |
assert.equal(5, b:len()); |
11109 | 46 |
assert.equal("world", b:read(5)); |
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end); |
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end); |
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||
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describe(":collapse()", function () |
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it("works on an empty buffer", function () |
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local b = dbuffer.new(); |
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b:collapse(); |
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end); |
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end); |
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||
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describe(":sub", function () |
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-- Helper function to compare buffer:sub() with string:sub() |
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local s = "hello world"; |
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local function test_sub(b, x, y) |
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local string_result, buffer_result = s:sub(x, y), b:sub(x, y); |
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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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end |
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||
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it("works", function () |
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local b = dbuffer.new(); |
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assert.truthy(b:write("hello world")); |
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assert.equals("hello", b:sub(1, 5)); |
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end); |
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||
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it("works after discard", function () |
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local b = dbuffer.new(256); |
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assert.truthy(b:write("foobar")); |
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assert.equals("foobar", b:sub(1, 6)); |
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assert.truthy(b:discard(3)); -- consume "foo" |
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assert.equals("bar", b:sub(1, 3)); |
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end); |
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||
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it("supports optional end parameter", function () |
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local b = dbuffer.new(); |
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assert.truthy(b:write("hello world")); |
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assert.equals("hello world", b:sub(1)); |
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assert.equals("world", b:sub(-5)); |
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end); |
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it("is equivalent to string:sub", function () |
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local b = dbuffer.new(11); |
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assert.truthy(b:write(s)); |
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for i = -13, 13 do |
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for j = -13, 13 do |
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test_sub(b, i, j); |
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end |
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end |
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end); |
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end); |
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||
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describe(":byte", function () |
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-- Helper function to compare buffer:byte() with string:byte() |
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local s = "hello world" |
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local function test_byte(b, x, y) |
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local string_result, buffer_result = {s:byte(x, y)}, {b:byte(x, y)}; |
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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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end |
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||
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it("is equivalent to string:byte", function () |
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local b = dbuffer.new(11); |
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assert.truthy(b:write(s)); |
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test_byte(b, 1); |
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test_byte(b, 3); |
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test_byte(b, -1); |
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test_byte(b, -3); |
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for i = -13, 13 do |
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for j = -13, 13 do |
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test_byte(b, i, j); |
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end |
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end |
|
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end); |
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||
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it("works with characters > 127", function () |
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local b = dbuffer.new(); |
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b:write(string.char(0, 140)); |
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local r = { b:byte(1, 2) }; |
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assert.same({ 0, 140 }, r); |
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end); |
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||
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it("works on an empty buffer", function () |
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local b = dbuffer.new(); |
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assert.equal("", b:sub(1,1)); |
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end); |
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end); |
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end); |