assert-gooder/test/test_assert-gooder.lua

local SUITE  =  require 'TestSuite' 'assert-gooder'
SUITE:setEnvironment {
    assert  =  require 'assert-gooder'
}

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SUITE:addTest('local variable', function ()
	local _, msg  =  pcall(function ()
		local a = 2
		assert(type(a) == 'string')
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (string expected, but got number: 2)', msg)
end)

SUITE:addTest('upvalue variable', function ()
	local a = 2
	local _, msg  =  pcall(function ()
		assert(type(a) == 'string')
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad upvalue \'a\' (string expected, but got number: 2)', msg)
end)

SUITE:addTest('global variable', function ()
	a = 2
	local _, msg  =  pcall(function ()
		assert(type(a) == 'string')
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad global \'a\' (string expected, but got number: 2)', msg)
end)

SUITE:addTest('argument to anon function', function ()
	local _, msg = pcall(function()
		(function (a)
			assert(type(a) == 'string')
		end)(2)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-3)..': '..'assertion failed! bad argument #1 \'a\' to the anonymous function at ./test/test_assert-gooder.lua:'..curline(-4)..' (string expected, but got number: 2)', msg)
end)

SUITE:addTest('argument to named function', function ()
	local f = function (a)
		assert(type(a) == 'string')
	end
	local _, msg = pcall(function () f(2) end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-3)..': '..'assertion failed! bad argument #1 \'a\' to \'f\' (string expected, but got number: 2)', msg)
end)

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SUITE:addTest('can improve asserts in loaded strings too', function ()
	local func = loadstring "return function(a) assert(type(a) == 'string')  end" ()
	local _, msg = pcall(setfenv(func, getfenv()), 42)
	assert_equal('[string "return function(a) assert(type(a) == \'string\'..."]:1: '..'assertion failed! bad argument #1 \'a\' to the anonymous function from loaded string (string expected, but got number: 42)', msg)
end)

SUITE:addTest('really complicated expression', function ()
	local f = function ()
		assert(a == 3 and math.floor(2.522) == 2 or 5 == n)
	end
	local _, msg = pcall(f, 2)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-3)..': '..'assertion failed! expression `a == 3 and math.floor(2.522) == 2 or 5 == n` evaluated to false', msg)
end)

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-- Other assert types

SUITE:addTest('compare values', function ()
	local _, msg  =  pcall(function ()
		local a = 2
		assert(a == 4)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (number 4 expected, but got: 2)', msg)
end)

SUITE:addTest('compare values across types', function ()
	local _, msg  =  pcall(function ()
		local a = "hi"
		assert(a == 4)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (number 4 expected, but got string: "hi")', msg)
end)

SUITE:addTest('is nil', function ()
	local _, msg  =  pcall(function ()
		local a = "hi"
		assert(a == nil)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (nil expected, but got string: "hi")', msg)
end)

SUITE:addTest('truthy', function ()
	local _, msg  =  pcall(function ()
		local a = false
		assert(a)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (truthy expected, but got false)', msg)
end)

SUITE:addTest('not equal', function (constant_value, msg_in_pars)
	local func = loadstring (("return function()                            local a = %s; assert(a ~= %s)  end"):format(constant_value, constant_value)) ()
	local _, msg = pcall(setfenv(func, getfenv()))
	assert_equal('[string "return function()                            ..."]:1: assertion failed! bad local \'a\' ('..msg_in_pars..')', msg)
end, { data = {
	{ 'true' ,	'expected anything other than true, but got true' },
	{ 'nil',  	'expected anything other than nil, but got nil' },
	{ '"hi"', 	'expected anything other than string "hi", but got "hi"' },
	{ '42',   	'expected anything other than number 42, but got 42' },
}})

SUITE:addTest('constant false', function ()
	local function f ()
		assert(false)
	end
	local _, msg  =  pcall(function() f() end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-3)..': '..'assertion failed! this assert will always fail, as it\'s body is `false`. assumingly this should be an unreachable part of \'f\'', msg)
end)

SUITE:addTest('constant nil', function ()
	local _, msg  =  pcall(function ()
		assert(nil)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! this assert will always fail, as it\'s body is `nil`. assumingly this should be an unreachable part of the anonymous function at ./test/test_assert-gooder.lua:'..curline(-3), msg)
end)



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return SUITE