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Testing the platform · 55 / 69

Move time without waiting

YOUR TASK

Make this happen

3 steps

  1. The testing clock is controlled by the test. Advance milliseconds instantly to test elapsed time. There is no real wait, and the result is repeatable. Implement elapsed(start) using the granted time capability.

  2. Read the cases in lesson.test.lua, then choose Check solution to see what needs to change.

  3. Update subject.lua until every test passes. Keep the supplied tests unchanged.

Start with Check solution, then use the failures to guide your edits.

Read the starter and tests

subject.lua

exports.elapsed = function(start: number): number
  return 0
end

lesson.test.lua

local t = require("test")
local subject = require("cococo.subject")
t.it("elapsed milliseconds", function()
  t.clock.set(1000)
  local start = time.now():epoch_millis()
  t.clock.advance(2500)
  t.expect(subject.load().elapsed(start)):eq(2500)
end)