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-rw-r--r--spec/util_dbuffer_spec.lua130
1 files changed, 130 insertions, 0 deletions
diff --git a/spec/util_dbuffer_spec.lua b/spec/util_dbuffer_spec.lua
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+++ b/spec/util_dbuffer_spec.lua
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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("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);