Testing by Assertions

Equality Check

Compare an actual value with an expected value.

expected versus actual An assertion starts by calculating an actual value and comparing it with the expected result.

Equality Check

expected
equality_check.lua
Replay: real traced execution (multi-file project)
local expected = 10
local actual = 5 + 5
local passed = actual == expected
local status = "fail"
if passed then
    status = "pass"
end
print("expected=" .. expected)
print("actual=" .. actual)
print("status=" .. status)

local expected = 8
local actual = 5 + 5
local passed = actual == expected
local status = "fail"
if passed then
    status = "pass"
end
print("expected=" .. expected)
print("actual=" .. actual)
print("status=" .. status)

local expected = 12
local actual = 5 + 5
local passed = actual == expected
local status = "fail"
if passed then
    status = "pass"
end
print("expected=" .. expected)
print("actual=" .. actual)
print("status=" .. status)

  1. expected ← 10, actual ← 10, passed ← true, status ← fail

    1local expected→ 10 = 10 --@expected=8, 122local actual→ 10 = 5 + 53local passed→ true = actual10 == expected104local status→ fail = "fail"5if passed then

  2. status ← pass

    4local status = "fail"5if passedtrue then6    status→ pass = "pass"7end

  3. print("expected=" .. expected)

    7end8print("expected=" .. expected10)9print("actual=" .. actual10)10print("status=" .. statuspass)
    outputexpected=10
actual=10
status=pass

  1. expected ← 8, actual ← 10, passed ← false, status ← fail

    1local expected→ 8 = 82local actual→ 10 = 5 + 53local passed→ false = actual10 == expected84local status→ fail = "fail"5if passed then6    status = "pass"7end8print("expected=" .. expected8)9print("actual=" .. actual10)10print("status=" .. statusfail)
    outputexpected=8
actual=10
status=fail

  1. expected ← 12, actual ← 10, passed ← false, status ← fail

    1local expected→ 12 = 122local actual→ 10 = 5 + 53local passed→ false = actual10 == expected124local status→ fail = "fail"5if passed then6    status = "pass"7end8print("expected=" .. expected12)9print("actual=" .. actual10)10print("status=" .. statusfail)
    outputexpected=12
actual=10
status=fail