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)


SUITE:addTest('indexing', function ()
	local _, msg  =  pcall(function ()
		local a = { b = 39 }
		assert(type(a.b) == 'string')
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad key "b" in local \'a\' (string expected, but got number 39)', msg)
end)

SUITE:addTest('subscript constant', function ()
	local _, msg  =  pcall(function ()
		local a = { 4, 2, 3, 6 }
		assert(type(a[2]) == 'string')
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad key 2 in local \'a\' (string expected, but got number 2)', msg)
end)

SUITE:addTest('subscript variable', function ()
	local _, msg  =  pcall(function ()
		local a, i = { 4, 2, 3, 6 }, 2
		assert(type(a[i]) == 'string')
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad key 2 in local \'a\' (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 (a was nil, n was nil)', msg)
end)

SUITE:addTest('really complicated expression with modified global', function ()
    tonumber = nil
	local f = function ()
		assert(a == 3 and math.floor(2.522) == 2 or 5 == n and tonumber)
	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 and tonumber` evaluated to false (a was nil, n was nil, standard-function tonumber was nil)', 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('truthy indexing', function ()
	local _, msg  =  pcall(function ()
		local a = { b = false }
		assert(a.b)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad key "b" in local \'a\' (truthy expected, but got false)', msg)
end)

SUITE:addTest('truthy subscript', function ()
	local _, msg  =  pcall(function ()
		local a = {}
		assert(a[6])
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad key 6 in local \'a\' (truthy expected, but got nil)', msg)
end)

SUITE:addTest('truthy variable subscript', function ()
	local _, msg  =  pcall(function ()
		local a, i = {}, 3
		assert(a[i])
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad key 3 in local \'a\' (truthy expected, but got nil)', 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)

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

SUITE:addTest('length of sequence EQUAL', function ()
	local _, msg  =  pcall(function ()
		local seq = {1, 2, 3, 4}
		assert(#seq == 5)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad length of local \'seq\' (length 5 expected, but got length 4)', msg)
end)

SUITE:addTest('length of sequence LESS THAN', function ()
	local _, msg  =  pcall(function ()
		local seq = {1, 2, 3, 4}
		assert(#seq < 3)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad length of local \'seq\' (length less than 3 expected, but got length 4)', msg)
end)

SUITE:addTest('length of sequence COMPARE', function ()
	local _, msg  =  pcall(function ()
		local seq_a = {1, 2, 3, 4}
		local seq_b = {1, 2, 3}
		assert(#seq_a == #seq_b)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad lengths of locals \'seq_a\' and \'seq_b\' (equal lengths expected, but got lengths 4 and 3)', msg)
end)

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-- Tables

SUITE:addTest('table with keys', function ()
	local _, msg  =  pcall(function ()
		local obj = { a = 42, b = 'euclidian fantasyland' }
		assert(type(obj) == 'table' and type(obj.a) == 'string' and type(obj.b) == 'number')
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad of local \'obj\' (table similar to { a: string, b: number, ... } expected, but got { a = 42, b = "euclidian fantasyland" })', msg)
end)

SUITE:addTest('table with more keys', function ()
    -- obj now has an extra key, this is reflected in the error
    -- message, by adding the extra ellipsis.
	local _, msg  =  pcall(function ()
		local obj = { a = 42, b = 'euclidian fantasyland', c = {} }
		assert(type(obj) == 'table' and type(obj.a) == 'string' and type(obj.b) == 'number')
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad of local \'obj\' (table similar to { a: string, b: number, ... } expected, but got { a = 42, b = "euclidian fantasyland", ... })', msg)
end)

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SUITE:addTest('Number below something', function ()
	local _, msg  =  pcall(function ()
		local a = 6
        assert(a < 5)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (number less than 5 expected, but got 6)', msg)
end)

SUITE:addTest('Number above something', function ()
	local _, msg  =  pcall(function ()
		local a = 6
        assert(a > 10)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (number greater than 10 expected, but got 6)', msg)
end)

SUITE:addTest('Number between something', function ()
	local _, msg  =  pcall(function ()
		local a = 11
        assert(a < 10 and 5 < a)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (number in range ]5,10[ expected, but got 6)', msg)
end)

SUITE:addTest('Number between something 2', function ()
	local _, msg  =  pcall(function ()
		local a = 11
        assert(a < 10 and 7 <= a)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (number in range [7,10[ expected, but got 6)', msg)
end)

SUITE:addTest('Identify positive number', function ()
	local _, msg  =  pcall(function ()
		local a = -20
        assert(0 <= a)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (positive number expected, but got negative number -20)', msg)
end)

SUITE:addTest('Identify integer', function ()
	local _, msg  =  pcall(function ()
		local a = 5.21
        assert(a % 1 == 0)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (integer expected, but got decimal number 5.21)', msg)
end)

SUITE:addTest('Identify even number', function ()
	local _, msg  =  pcall(function ()
		local a = 5
        assert(a % 2 == 0)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (even number expected, but got odd number 5)', msg)
end)

SUITE:addTest('Identify odd number', function ()
	local _, msg  =  pcall(function ()
		local a = 6
        assert(a % 2 == 1)
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'assertion failed! bad local \'a\' (odd number expected, but got even number 5.21)', msg)
end)

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-- Custom error message

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

SUITE:addTest('Custom formatted message', function ()
	local _, msg  =  pcall(function ()
		local a = 2
		assert(type(a) == 'string', 'expected string not %s', type(a))
	end)
	assert_equal('./test/test_assert-gooder.lua:'..curline(-2)..': '..'expected string not number: bad local \'a\' (string expected, but got number 2)', msg)
end)




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return SUITE