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I've found that test-driven development is the fastest way for me to learn a new language. There is no better way to bootstrap the learning process than by figuring out how to cobble together a minimal expectation-based testing framework in the new language. The following is the result of my first hour with Lua.
-- #t behaves strangely with hashtables & nil values
function table_length(t)
local count = 0
for _ in pairs(t) do count = count + 1 end
return count
end
function Test(test, expectation)
return {
test = test,
expectation = expectation,
run = function(self)
local result = self.test()
return self.expectation(result)
end
}
end
function TestSuite(tests)
return {
run = function(self)
print("Running test suite...")
local failed_tests = {}
for k,v in pairs(self.tests) do
local outcome = v:run()
if outcome then
io.write(".")
else
io.write("-")
failed_tests[k] = outcome
end
end
print("")
local failed_count = table_length(failed_tests)
if failed_count > 0 then
print(failed_count.." failed test(s): ")
for k,v in pairs(failed_tests) do
io.write(k.." ")
end
print("")
else
print("Success!")
end
end,
tests = tests
}
end
tests = {
simple = Test(
function()
return 5
end,
function(result)
return result == 5
end
)
}
TestSuite(tests):run()
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