pico-test

> Note: This project is still in its initial stages, so I'd love feedback about the API and issue reports.

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PICO-8 is great but debugging your code in this little vm can be a chore.

If you're tired of riddling your carts with prinths or have given up on test-driven development, this tool should help you out.

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npm i -g pico-test

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Copy/paste the following snippet into the cart you wish to test:

``lua
function test(title,f)
local desc=function(msg,f)
printh('⚡:desc:'..msg)
f()
end
local it=function(msg,f)
printh('⚡:it:'..msg)
local xs={f()}
for i=1,#xs do
if xs[i] == true then
printh('⚡:assert:true')
else
printh('⚡:assert:false')
end
end
printh('⚡:it_end')
end
printh('⚡:test:'..title)
f(desc,it)
printh('⚡:test_end')
end
`

Next, be sure PICO-8 is aliased properly in your terminal. You may have to do something like the following:

alias pico-8='/Applications/PICO-8.app/Contents/MacOS/pico8'

Last, run Pico-8 from your terminal and pipe its output to pico-test.

pico-8 | pico-test

Each time your run your cart, test results will be printed to stdout. Now, you just have to write some tests! :)

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pico-test's api is will be pretty familiar if you've ever used mocha. There are only 3 functions to learn: test(), desc(), and it()

#### test(title:string, fn:function)

initiates testing, wraps around test descriptions and tests, providing the callback fn with two args: desc and it – the other two functions in this API.

| Type | Param | Description |
|----------|-------|-------------|
| String | title | title of test suite
| Function | fn | callback to call with desc and it

#### desc(description:string, fn:function)

Describes a set of tests. This function is applied as the first argument of the callback function passed to test

| Type | Param | Description |
|----------|-------------|-------------|
| String | description | description for tests to be run inside of param fn
| Function | fn | callback to call with desc and it


#### it(message:string, fn:function)

Returns one or more boolean values representing test assertions. all returned values must be true or your test will fail. This function is applied as the second argument of the callback function passed to test

| Type | Param | Description |
|----------|---------|-------------|
| String | message | message starting with "should"
| Function | fn | callback to return assertions from

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Here's what it looks like in action:

`lua
-- here's an object with methods we want to test
local math={
gt=function(a,b) return a>b end,
lt=function(a,b) return a mul=function(a,b) return a*b end,
div=function(a,b) return a/b end
}

test('math functions', function(desc,it)
desc('math.gt()', function()
local gt = math.gt
it('should return type boolean', function()
return 'boolean' == type(gt(1,0))
end)
it('should give same result as > operator', function()
return gt(1,0)
end)
end)

desc('math.lt()', function()
local lt = math.lt
it('should return type boolean',function()
return 'boolean' == type(lt(1,0))
end)
it('should give same result as < operator',function()
return lt(1, 0) == false
end)
end)

desc('math.mul()', function()
local mul = math.mul
it('should return type number', function()
local a = rnd(time())
local b = rnd(time())
return 'number' == type(mul(a,b))
end)
it('should give same result as * operator', function()
local x=rnd(time())
return
x*1 == mul(x,1),
x*2 == mul(x,2),
x*3 == mul(x,3)
end)
end)

desc('math.div()', function()
local div = math.div
it('should return type number', function()
local a = rnd(time())
local b = rnd(time())
return 'number' == type(div(a,b))
end)
it('should give same result as / operator', function()
local x=1+rnd(time())
return
x/1 == div(x,1),
x/2 == div(x,2),
x/3 == div(x,3)
end)
end)

end)
``

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Copyright (c) 2015 Josiah Savary. Made available under The MIT License (MIT).