commit 8d1cdf7514e369e2974dd205c6bbe046f7f823af
Author: Rokas Puzonas <rokas.puz@gmail.com>
Date:   Thu May 11 21:50:02 2023 +0300

    initial commit

diff --git a/.luarc.json b/.luarc.json
new file mode 100644
index 0000000..99bd5c9
--- /dev/null
+++ b/.luarc.json
@@ -0,0 +1,6 @@
+{
+    "$schema": "https://raw.githubusercontent.com/sumneko/vscode-lua/master/setting/schema.json",
+    "Lua.diagnostics.globals": [
+        "peripheral"
+    ]
+}
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6caf9ce
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# Fake CC peripherals
+
+Create fake CC peripherals, useful for testing libraries which directly interact with peripherals
diff --git a/init.lua b/init.lua
new file mode 100644
index 0000000..6b81847
--- /dev/null
+++ b/init.lua
@@ -0,0 +1,221 @@
+local PeripheralAPIFake = {}
+PeripheralAPIFake.__index = PeripheralAPIFake
+
+local expect = require("cc.expect").expect
+
+local function isPeripheral(peripheral)
+	if type(peripheral) ~= "table" then return false end
+	local meta = getmetatable(peripheral)
+
+	if type(meta) ~= "table" then return false end
+	if meta.__name ~= "peripheral" then return false end
+	if type(meta.name) ~= "string" then return false end
+	if type(meta.type) ~= "string" then return false end
+	if type(meta.types) ~= "table" then return false end
+	for _, ty in ipairs(meta.types) do
+		if not meta.types[ty] then return false end
+	end
+
+	return true
+end
+
+-- TODO: Add descriptive error messages to asserts
+local function expectPeripheral(index, peripheral)
+	if not isPeripheral(peripheral) then
+		error(("bad argument #%d (table is not a peripheral)"):format(index), 3)
+	end
+end
+
+--- Performs a deep clone of a table.
+local function cloneTable(t)
+	local mt = getmetatable(t)
+	setmetatable(t, nil)
+	local cloned = {}
+	for k, v in pairs(t) do
+		if type(v) == "table" then
+			cloned[k] = cloneTable(v)
+		else
+			cloned[k] = v
+		end
+	end
+	setmetatable(t, mt)
+	return cloned
+end
+
+local function doesTableContain(t, value)
+	for _, v in pairs(t) do
+		if v == value then
+			return true
+		end
+	end
+	return false
+end
+
+local function getPeripheralName(peripheral)
+	return getmetatable(peripheral).name
+end
+
+local function getPeripheralTypes(peripheral)
+	return getmetatable(peripheral).types
+end
+
+function PeripheralAPIFake.new(peripherals)
+	expect(1, peripherals, "table", "nil")
+
+	local self = setmetatable({}, PeripheralAPIFake)
+	self.peripherals = {}
+
+	if peripherals then
+		for _, peripheral in ipairs(peripherals) do
+			self:addPeripehral(peripheral)
+		end
+	end
+
+	return self
+end
+
+function PeripheralAPIFake:newExternalAPI()
+	local api = {}
+
+	function api.call(name, method, ...)
+		expect(1, name, "string")
+		expect(2, method, "string")
+		local peripheral = self.peripherals[name]
+		if not peripheral then return end
+		local func = peripheral[method]
+		if type(func) ~= "function" then
+			error(("No such method %s"):format(method), 2)
+		end
+		return func(...)
+	end
+
+	function api.find(ty, filter)
+		expect(1, ty, "string")
+		expect(2, filter, "function", "nil")
+		local peripherals = {}
+		for name, peripheral in pairs(self.peripherals) do
+			local types = getPeripheralTypes(peripheral)
+			if doesTableContain(types, ty) then
+				local wrapped = api.wrap(name)
+				if not filter or filter(name, wrapped) then
+					table.insert(peripherals, wrapped)
+				end
+			end
+		end
+		return peripherals
+	end
+
+	function api.getMethods(name)
+		expect(1, name, "string")
+		local peripheral = self:getPeripheral(name)
+		if not peripheral then return end
+
+		local methods = {}
+		for methodName, method in pairs(peripheral) do
+			if type(method) == "function" then
+				table.insert(methods, methodName)
+			end
+		end
+		return methods
+	end
+
+	function api.getName(peripheral)
+		expect(1, peripheral, "table", "string")
+		expectPeripheral(1, peripheral)
+		return getPeripheralName(peripheral)
+	end
+
+	function api.getNames()
+		return self:listPeripherals()
+	end
+
+	function api.getType(peripheral)
+		expect(1, peripheral, "table", "string")
+		if type(peripheral) == "table" then
+			expectPeripheral(1, peripheral)
+		end
+		local p = self:getPeripheral(peripheral)
+		return table.unpack(getPeripheralTypes(p))
+	end
+
+	function api.hasType(peripheral, peripheral_type)
+		expect(1, peripheral, "table", "string")
+		if type(peripheral) == "table" then
+			expectPeripheral(1, peripheral)
+		end
+		expect(2, peripheral_type, "string")
+		local p = self:getPeripheral(peripheral)
+		if not p then return end
+
+		local types = getPeripheralTypes(peripheral)
+		return doesTableContain(types, peripheral_type)
+	end
+
+	function api.isPresent(name)
+		expect(1, name, "string")
+		return self:hasPeripheral(name)
+	end
+
+	function api.wrap(name)
+		expect(1, name, "string")
+		local peripheral = self.peripherals[name]
+		if not peripheral then return end
+		return cloneTable(peripheral)
+	end
+
+	return api
+end
+
+function PeripheralAPIFake:addPeripehral(peripheral)
+	expect(1, peripheral, "table")
+	expectPeripheral(1, peripheral)
+
+	local name = getPeripheralName(peripheral)
+	assert(not self.peripherals[name], "Expected peripheral name to be unique, it's not unique")
+	assert(not self:hasPeripheral(peripheral), "Peripheral already added to system")
+
+	self.peripherals[name] = peripheral
+end
+
+function PeripheralAPIFake:removePeripheral(peripheral)
+	expect(1, peripheral, "table", "string")
+
+	if type(peripheral) == "string" then
+		self.peripherals[peripheral] = nil
+	else
+		expectPeripheral(1, peripheral)
+		local name = getPeripheralName(peripheral)
+		self.peripherals[name] = nil
+	end
+end
+
+function PeripheralAPIFake:hasPeripheral(peripheral)
+	expect(1, peripheral, "table", "string")
+	return self:getPeripheral(peripheral) ~= nil
+end
+
+function PeripheralAPIFake:getPeripheral(peripheral)
+	expect(1, peripheral, "table", "string")
+
+	if type(peripheral) == "string" then
+		return self.peripherals[peripheral]
+	else
+		expectPeripheral(1, peripheral)
+		local name = getPeripheralName(peripheral)
+		return self.peripherals[name]
+	end
+end
+
+function PeripheralAPIFake:getPeripheralName(peripheral)
+	return getPeripheralName(self:getPeripheral(peripheral))
+end
+
+function PeripheralAPIFake:listPeripherals()
+	local names = {}
+	for _, peripheral in pairs(self.peripherals) do
+		table.insert(names, getPeripheralName(peripheral))
+	end
+	return names
+end
+
+return PeripheralAPIFake
diff --git a/init.test.lua b/init.test.lua
new file mode 100644
index 0000000..ba9fa13
--- /dev/null
+++ b/init.test.lua
@@ -0,0 +1,195 @@
+local lust = require("lust").nocolor()
+local PeripheralAPIMock = require("init")
+local describe, it, expect = lust.describe, lust.it, lust.expect
+
+local function newPeripheralStub(name, types, methodNames)
+	local peripheral = {}
+	local metaTypes = {}
+	for i, ty in ipairs(types) do
+		metaTypes[i] = ty
+		metaTypes[ty] = true
+	end
+
+	setmetatable(peripheral, {
+		__name = "peripheral",
+		name = name,
+		type = types[1],
+		types = metaTypes
+	})
+
+	for _, methodName in pairs(methodNames) do
+		peripheral[methodName] = function() end
+	end
+
+	return peripheral
+end
+
+local function newInventoryStub(type, id)
+	return newPeripheralStub(("%s_%d"):format(type, id), {type, "inventory"}, {
+		"size",
+		"list",
+		"getItemDetail",
+		"getItemLimit",
+		"pushItems",
+		"pullItems"
+	})
+end
+
+local function pprint(...)
+	local pretty = require("cc.pretty")
+	pretty.print(pretty.pretty(...))
+end
+
+describe("peripherals mock", function()
+	it("initialize with no peripherals by default", function()
+		local peripheral = PeripheralAPIMock.new()
+		expect(peripheral:listPeripherals()).to.equal{}
+	end)
+
+	it("initialize with initial peripherals", function()
+		local chest1 = newInventoryStub("minecraft:chest", 1)
+		local chest2 = newInventoryStub("minecraft:chest", 2)
+		local peripheral = PeripheralAPIMock.new{ chest1, chest2 }
+		expect(peripheral:listPeripherals()).to.equal{
+			"minecraft:chest_1",
+			"minecraft:chest_2",
+		}
+	end)
+
+	it("throw error if given table is not a valid peripheral", function()
+		local chest = { }
+		expect(function()
+			PeripheralAPIMock.new{ chest }
+		end).to.fail()
+	end)
+
+	it("check if peripheral is added", function()
+		local chest = newInventoryStub("minecraft:chest", 1)
+		local peripheral = PeripheralAPIMock.new{ chest }
+		expect(peripheral:hasPeripheral(chest)).to.be.truthy()
+	end)
+
+	it("check if peripheral is removed", function()
+		local chest = newInventoryStub("minecraft:chest", 1)
+		local peripheral = PeripheralAPIMock.new{ chest }
+		expect(peripheral:hasPeripheral(chest)).to.be.truthy()
+		peripheral:removePeripheral(chest)
+		expect(peripheral:hasPeripheral(chest)).to_not.be.truthy()
+	end)
+
+	it("listPeripherals returns a new list every time", function()
+		local peripheral = PeripheralAPIMock.new()
+		expect(peripheral:listPeripherals()).to_not.be(peripheral:listPeripherals())
+	end)
+
+	describe("external api", function()
+		local chest1, chest2, api
+		lust.before(function()
+			chest1 = newInventoryStub("minecraft:chest", 1)
+			chest2 = newInventoryStub("minecraft:chest", 2)
+			local peripheral = PeripheralAPIMock.new{ chest1, chest2 }
+			api = peripheral:newExternalAPI()
+		end)
+
+		it("has the same methods as the real api", function()
+			for	methodName in pairs(peripheral) do
+				assert(type(api[methodName]) == "function", ("Missing method %s"):format(methodName))
+			end
+			expect(#api).to.be(#peripheral)
+		end)
+
+		it("using .call and .wrap, invoke the same function", function()
+			local spy = lust.spy(chest1, "size")
+			api.call("minecraft:chest_1", "size")
+			expect(#spy).to.be(1)
+			api.wrap("minecraft:chest_1").size()
+			expect(#spy).to.be(2)
+		end)
+
+		it(".call dosen't supply self to methods", function()
+			local spy = lust.spy(chest1, "size")
+			api.call("minecraft:chest_1", "size", 1, 2, 3)
+			expect(spy).to.equal{{1, 2, 3}}
+		end)
+
+		it(".call returns nil if peripheral was not found", function()
+			expect(api.call("foobar", "size")).to.be(nil)
+		end)
+
+		it(".call throws error if peripheral dosen't have requested method", function()
+			expect(function()
+				api.call("minecraft:chest_1", "foobar")
+			end).to.fail()
+		end)
+
+		it(".wrap returns a new table each time, but have the same contents", function()
+			local name = "minecraft:chest_1"
+			expect(api.wrap(name)).to.equal(api.wrap(name))
+			expect(api.wrap(name)).to_not.be(api.wrap(name))
+		end)
+
+		it(".wrap returns nil if peripheral was not found", function()
+			expect(api.wrap("foobar")).to.be(nil)
+		end)
+
+		it("check if peripheral exists if .isPresent", function()
+			expect(api.isPresent("minecraft:chest_1")).to.be(true)
+			expect(api.isPresent("foobar")).to.be(false)
+		end)
+
+		it(".getType throws error if given table is not a peripheral", function()
+			expect(function ()
+				api.getType({})
+			end).to.fail()
+
+			expect(function ()
+				api.getType(chest1)
+			end).to_not.fail()
+		end)
+
+		it(".getType returns multiple types if that peripheral has it", function()
+			local types = {api.getType("minecraft:chest_1")}
+			expect(types).to.equal{"minecraft:chest", "inventory"}
+		end)
+
+		it(".getNames returns a new table each time, but have the same contents", function()
+			expect(api.getNames()).to.equal(api.getNames())
+			expect(api.getNames()).to_not.be(api.getNames())
+		end)
+
+		it(".getName throws error if table is not a valid peripheral", function()
+			expect(function()
+				api.getName({})
+			end).to.fail()
+
+			expect(function()
+				api.getName(chest1)
+			end).to_not.fail()
+		end)
+
+		it(".getMethods returns nil if peripheral is not found", function()
+			expect(api.getMethods("foobar")).to.be(nil)
+		end)
+
+		it(".hasType returns nil if peripheral is not found", function()
+			expect(api.hasType("foobar", "inventory")).to.be(nil)
+		end)
+
+		it(".hasType returns true if peripheral has target type", function()
+			expect(api.hasType(chest1, "inventory")).to.be(true)
+		end)
+
+		it(".find returns a list of wrapped peripherals", function()
+			local peripherals = api.find("inventory")
+			expect(peripherals).to.equal{ chest1, chest2 }
+		end)
+
+		it(".find with filter returns a list of wrapped peripherals", function()
+			local peripherals = api.find("inventory", function(_, wrapped)
+				return wrapped.size ~= nil
+			end)
+			expect(peripherals).to.equal{ chest1, chest2 }
+		end)
+	end)
+end)
+
diff --git a/lust.lua b/lust.lua
new file mode 100644
index 0000000..791c409
--- /dev/null
+++ b/lust.lua
@@ -0,0 +1,231 @@
+-- lust v0.1.0 - Lua test framework
+-- https://github.com/bjornbytes/lust
+-- MIT LICENSE
+
+local lust = {}
+lust.level = 0
+lust.passes = 0
+lust.errors = 0
+lust.befores = {}
+lust.afters = {}
+
+local red = string.char(27) .. '[31m'
+local green = string.char(27) .. '[32m'
+local normal = string.char(27) .. '[0m'
+local function indent(level) return string.rep('\t', level or lust.level) end
+
+function lust.nocolor()
+  red, green, normal = '', '', ''
+  return lust
+end
+
+function lust.describe(name, fn)
+  print(indent() .. name)
+  lust.level = lust.level + 1
+  fn()
+  lust.befores[lust.level] = {}
+  lust.afters[lust.level] = {}
+  lust.level = lust.level - 1
+end
+
+function lust.it(name, fn)
+  for level = 1, lust.level do
+    if lust.befores[level] then
+      for i = 1, #lust.befores[level] do
+        lust.befores[level][i](name)
+      end
+    end
+  end
+
+  local success, err = pcall(fn)
+  if success then lust.passes = lust.passes + 1
+  else lust.errors = lust.errors + 1 end
+  local color = success and green or red
+  local label = success and 'PASS' or 'FAIL'
+  print(indent() .. color .. label .. normal .. ' ' .. name)
+  if err then
+    print(indent(lust.level + 1) .. red .. err .. normal)
+  end
+
+  for level = 1, lust.level do
+    if lust.afters[level] then
+      for i = 1, #lust.afters[level] do
+        lust.afters[level][i](name)
+      end
+    end
+  end
+end
+
+function lust.before(fn)
+  lust.befores[lust.level] = lust.befores[lust.level] or {}
+  table.insert(lust.befores[lust.level], fn)
+end
+
+function lust.after(fn)
+  lust.afters[lust.level] = lust.afters[lust.level] or {}
+  table.insert(lust.afters[lust.level], fn)
+end
+
+-- Assertions
+local function isa(v, x)
+  if type(x) == 'string' then
+    return type(v) == x,
+      'expected ' .. tostring(v) .. ' to be a ' .. x,
+      'expected ' .. tostring(v) .. ' to not be a ' .. x
+  elseif type(x) == 'table' then
+    if type(v) ~= 'table' then
+      return false,
+        'expected ' .. tostring(v) .. ' to be a ' .. tostring(x),
+        'expected ' .. tostring(v) .. ' to not be a ' .. tostring(x)
+    end
+
+    local seen = {}
+    local meta = v
+    while meta and not seen[meta] do
+      if meta == x then return true end
+      seen[meta] = true
+      meta = getmetatable(meta) and getmetatable(meta).__index
+    end
+
+    return false,
+      'expected ' .. tostring(v) .. ' to be a ' .. tostring(x),
+      'expected ' .. tostring(v) .. ' to not be a ' .. tostring(x)
+  end
+
+  error('invalid type ' .. tostring(x))
+end
+
+local function has(t, x)
+  for k, v in pairs(t) do
+    if v == x then return true end
+  end
+  return false
+end
+
+local function strict_eq(t1, t2)
+  if type(t1) ~= type(t2) then return false end
+  if type(t1) ~= 'table' then return t1 == t2 end
+  for k, _ in pairs(t1) do
+    if not strict_eq(t1[k], t2[k]) then return false end
+  end
+  for k, _ in pairs(t2) do
+    if not strict_eq(t2[k], t1[k]) then return false end
+  end
+  return true
+end
+
+local paths = {
+  [''] = { 'to', 'to_not' },
+  to = { 'have', 'equal', 'be', 'exist', 'fail' },
+  to_not = { 'have', 'equal', 'be', 'exist', 'fail', chain = function(a) a.negate = not a.negate end },
+  a = { test = isa },
+  an = { test = isa },
+  be = { 'a', 'an', 'truthy',
+    test = function(v, x)
+      return v == x,
+        'expected ' .. tostring(v) .. ' and ' .. tostring(x) .. ' to be equal',
+        'expected ' .. tostring(v) .. ' and ' .. tostring(x) .. ' to not be equal'
+    end
+  },
+  exist = {
+    test = function(v)
+      return v ~= nil,
+        'expected ' .. tostring(v) .. ' to exist',
+        'expected ' .. tostring(v) .. ' to not exist'
+    end
+  },
+  truthy = {
+    test = function(v)
+      return v,
+        'expected ' .. tostring(v) .. ' to be truthy',
+        'expected ' .. tostring(v) .. ' to not be truthy'
+    end
+  },
+  equal = {
+    test = function(v, x)
+      return strict_eq(v, x),
+        'expected ' .. tostring(v) .. ' and ' .. tostring(x) .. ' to be exactly equal',
+        'expected ' .. tostring(v) .. ' and ' .. tostring(x) .. ' to not be exactly equal'
+    end
+  },
+  have = {
+    test = function(v, x)
+      if type(v) ~= 'table' then
+        error('expected ' .. tostring(v) .. ' to be a table')
+      end
+
+      return has(v, x),
+        'expected ' .. tostring(v) .. ' to contain ' .. tostring(x),
+        'expected ' .. tostring(v) .. ' to not contain ' .. tostring(x)
+    end
+  },
+  fail = {
+    test = function(v)
+      return not pcall(v),
+        'expected ' .. tostring(v) .. ' to fail',
+        'expected ' .. tostring(v) .. ' to not fail'
+    end
+  }
+}
+
+function lust.expect(v)
+  local assertion = {}
+  assertion.val = v
+  assertion.action = ''
+  assertion.negate = false
+
+  setmetatable(assertion, {
+    __index = function(t, k)
+      if has(paths[rawget(t, 'action')], k) then
+        rawset(t, 'action', k)
+        local chain = paths[rawget(t, 'action')].chain
+        if chain then chain(t) end
+        return t
+      end
+      return rawget(t, k)
+    end,
+    __call = function(t, ...)
+      if paths[t.action].test then
+        local res, err, nerr = paths[t.action].test(t.val, ...)
+        if assertion.negate then
+          res = not res
+          err = nerr or err
+        end
+        if not res then
+          error(err or 'unknown failure', 2)
+        end
+      end
+    end
+  })
+
+  return assertion
+end
+
+function lust.spy(target, name, run)
+  local spy = {}
+  local subject
+
+  local function capture(...)
+    table.insert(spy, {...})
+    return subject(...)
+  end
+
+  if type(target) == 'table' then
+    subject = target[name]
+    target[name] = capture
+  else
+    run = name
+    subject = target or function() end
+  end
+
+  setmetatable(spy, {__call = function(_, ...) return capture(...) end})
+
+  if run then run() end
+
+  return spy
+end
+
+lust.test = lust.it
+lust.paths = paths
+
+return lust