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81 lines
2.8 KiB
Lua
81 lines
2.8 KiB
Lua
-- This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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-- This file is based on Lua 5.x tests -- https://github.com/lua/lua/tree/master/testes
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print("testing if-else expressions")
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function True()
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return true
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end
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function False()
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return false
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end
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function EvalElseifChain(condition1, condition2, condition3)
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return if condition1 then 10 elseif condition2 then 20 elseif condition3 then 30 else 40
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end
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function EvalElse_IfChain(condition1, condition2, condition3)
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return if condition1 then 10 else if condition2 then 20 else if condition3 then 30 else 40
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end
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function CheckForConditionalEvaluation(condition)
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local counter = 0
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local function AddToCounter(count)
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counter += count
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return counter
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end
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local result = if condition then AddToCounter(7) else AddToCounter(17)
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if condition then
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assert(result == 7)
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else
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assert(result == 17)
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end
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-- ensure the counter value matches the result of the clause that was evaluated
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assert(counter == result)
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end
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-- Test expression using only constants
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assert(if true then true else false)
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assert(if false then false else true)
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assert(if nil then false else true)
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assert((7 + if true then 10 else 20) == 17)
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-- Test expression using non-constant condition
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assert(if True() then true else false)
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assert(if False() then false else true)
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-- Test evaluation of a "chain" of if/elseif/else in an expression
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assert(EvalElseifChain(false, false, false) == 40)
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assert(EvalElseifChain(false, false, true) == 30)
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assert(EvalElseifChain(false, true, false) == 20)
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assert(EvalElseifChain(false, true, true) == 20)
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assert(EvalElseifChain(true, false, false) == 10)
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assert(EvalElseifChain(true, false, true) == 10)
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assert(EvalElseifChain(true, true, false) == 10)
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assert(EvalElseifChain(true, true, true) == 10)
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-- Test evaluation of a "chain" of if/"else if"/else in an expression
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assert(EvalElse_IfChain(false, false, false) == 40)
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assert(EvalElse_IfChain(false, false, true) == 30)
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assert(EvalElse_IfChain(false, true, false) == 20)
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assert(EvalElse_IfChain(false, true, true) == 20)
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assert(EvalElse_IfChain(true, false, false) == 10)
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assert(EvalElse_IfChain(true, false, true) == 10)
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assert(EvalElse_IfChain(true, true, false) == 10)
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assert(EvalElse_IfChain(true, true, true) == 10)
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-- Test nesting of if-else expressions inside the condition of an if-else expression
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assert((if (if True() then false else true) then 10 else 20) == 20)
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assert((if if True() then false else true then 10 else 20) == 20)
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-- Ensure that if/else expressions are conditionally evaluated
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-- i.e. verify the evaluated expression doesn't evaluate the true and false expressions and
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-- merely select the proper value.
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CheckForConditionalEvaluation(true)
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CheckForConditionalEvaluation(false)
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return('OK')
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