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return describe("advanced functions", function()
it("should support fat arrow with self", function()
local obj = {
value = 10,
getValue = function(self)
return self.value
end
}
return assert.same(obj:getValue(), 10)
end)
it("should work with argument defaults", function()
local fn
fn = function(name, height)
if name == nil then
name = "something"
end
if height == nil then
height = 100
end
return tostring(name) .. ", " .. tostring(height)
end
assert.same(fn(), "something, 100")
assert.same(fn("test"), "test, 100")
return assert.same(fn("test", 50), "test, 50")
end)
it("should handle defaults with previous arguments", function()
local fn
fn = function(x, y)
if x == nil then
x = 100
end
if y == nil then
y = x + 1000
end
return x + y
end
assert.same(fn(), 1200)
return assert.same(fn(50), 1100)
end)
it("should work with multi-line arguments", function()
local my_func
my_func = function(a, b, c, d, e, f)
return a + b + c + d + e + f
end
local result = my_func(5, 4, 3, 8, 9, 10)
return assert.same(result, 39)
end)
it("should support nested function calls", function()
local another_func
another_func = function(a, b, c, d, e, f)
return a + b + c + d + e + f
end
local my_func
my_func = function(a, b, c, d, e, f, g)
return a + b + c + d + e + f + g
end
local result = my_func(5, 6, 7, 6, another_func(6, 7, 8, 9, 1, 2), 5, 4)
return assert.same(result, 66)
end)
it("should handle implicit return", function()
local sum
sum = function(x, y)
return x + y
end
return assert.same(sum(10, 20), 30)
end)
it("should work with explicit return", function()
local difference
difference = function(x, y)
return x - y
end
return assert.same(difference(20, 10), 10)
end)
it("should support multiple return values", function()
local mystery
mystery = function(x, y)
return x + y, x - y
end
local a, b = mystery(10, 20)
assert.same(a, 30)
return assert.same(b, -10)
end)
it("should work with function as argument", function()
local apply
apply = function(fn, x, y)
return fn(x, y)
end
local result = apply((function(a, b)
return a + b
end), 5, 10)
return assert.same(result, 15)
end)
it("should handle function returning function", function()
local create_adder
create_adder = function(x)
return function(y)
return x + y
end
end
local add_five = create_adder(5)
return assert.same(add_five(10), 15)
end)
it("should support immediately invoked function", function()
local result = (function(x)
return x * 2
end)(5)
return assert.same(result, 10)
end)
it("should work with varargs", function()
local sum_all
sum_all = function(...)
local total = 0
for i = 1, select('#', ...) do
if type(select(i, ...)) == "number" then
total = total + select(i, ...)
end
end
return total
end
return assert.same(sum_all(1, 2, 3, 4, 5), 15)
end)
it("should handle named varargs", function()
local fn
fn = function(...)
local t = {
n = select("#", ...),
...
}
local count = 0
for i = 1, t.n do
count = count + 1
end
return count
end
return assert.same(fn(1, 2, 3), 3)
end)
it("should support prefixed return", function()
local findValue
findValue = function()
local items = {
1,
2,
3
}
for _index_0 = 1, #items do
local item = items[_index_0]
if item == 5 then
return item
end
end
return "not found"
end
local result = findValue()
return assert.same(result, "not found")
end)
it("should work with parameter destructuring", function()
local fn
fn = function(_arg_0)
local a, b, c
a, b, c = _arg_0.a, _arg_0.b, _arg_0.c
return a + b + c
end
return assert.same(fn({
a = 1,
b = 2,
c = 3
}), 6)
end)
it("should handle default values in destructuring", function()
local fn
fn = function(_arg_0)
local a1, b
a1, b = _arg_0.a, _arg_0.b
if a1 == nil then
a1 = 123
end
if b == nil then
b = 'abc'
end
return a1 .. " " .. b
end
assert.same(fn({ }), "123 abc")
return assert.same(fn({
a = 456
}), "456 abc")
end)
it("should support empty function body", function()
local empty_fn
empty_fn = function() end
return assert.same(empty_fn(), nil)
end)
it("should work with function in table", function()
local tb = {
value = 10,
double = function(self)
return self.value * 2
end
}
return assert.same(tb:double(), 20)
end)
it("should handle function with no arguments", function()
local fn
fn = function()
return "result"
end
assert.same(fn(), "result")
return assert.same(fn(), "result")
end)
it("should support calling function with !", function()
local fn
fn = function()
return 42
end
return assert.same(fn(), 42)
end)
it("should work with nested functions", function()
local outer
outer = function(x)
local inner
inner = function(y)
return x + y
end
return inner
end
local add_five = outer(5)
return assert.same(add_five(10), 15)
end)
it("should handle function in expression", function()
local result
if (function(x)
return x > 10
end)(15) then
result = "large"
else
result = "small"
end
return assert.same(result, "large")
end)
return it("should support function as return value", function()
local get_operation
get_operation = function(op)
if "add" == op then
return function(a, b)
return a + b
end
elseif "subtract" == op then
return function(a, b)
return a - b
end
else
return function()
return 0
end
end
end
local add = get_operation("add")
return assert.same(add(5, 3), 8)
end)
end)
|
