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-rw-r--r--spec/util_ringbuffer_spec.lua85
1 files changed, 85 insertions, 0 deletions
diff --git a/spec/util_ringbuffer_spec.lua b/spec/util_ringbuffer_spec.lua
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+++ b/spec/util_ringbuffer_spec.lua
@@ -0,0 +1,85 @@
+local rb = require "util.ringbuffer";
+describe("util.ringbuffer", function ()
+ describe("#new", function ()
+ it("has a constructor", function ()
+ assert.Function(rb.new);
+ end);
+ it("can be created", function ()
+ assert.truthy(rb.new());
+ end);
+ it("won't create an empty buffer", function ()
+ assert.has_error(function ()
+ rb.new(0);
+ end);
+ end);
+ it("won't create a negatively sized buffer", function ()
+ assert.has_error(function ()
+ rb.new(-1);
+ end);
+ end);
+ end);
+ describe(":write", function ()
+ local b = rb.new();
+ it("works", function ()
+ assert.truthy(b:write("hi"));
+ end);
+ end);
+ describe(":sub", function ()
+ -- Helper function to compare buffer:sub() with string:sub()
+ local function test_sub(b, x, y)
+ local s = b:read(#b, true);
+ 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 = rb.new();
+ b:write("hello world");
+ assert.equals("hello", b:sub(1, 5));
+ end);
+
+ it("supports optional end parameter", function ()
+ local b = rb.new();
+ 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 = rb.new(6);
+ b:write("foobar");
+ b:read(3);
+ b:write("foo");
+ 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 function test_byte(b, x, y)
+ local s = b:read(#b, true);
+ 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 = rb.new(6);
+ b:write("foobar");
+ b:read(3);
+ b:write("foo");
+ 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);
+ end);
+end);