Luassert

luassert extends Lua's built-in assertions to provide additional tests and the ability to create your own. You can modify chains of assertions with not.

Check out busted for extended examples.

assert = require("luassert")

assert.True(true)
assert.is.True(true)
assert.is_true(true)
assert.is_not.True(false)
assert.is.Not.True(false)
assert.is_not_true(false)
assert.are.equal(1, 1)
assert.has.errors(function() error("this should fail") end)

Extend your own:

local assert = require("luassert")
local say    = require("say") --our i18n lib, installed through luarocks, included as a luassert dependency

local function has_property(table, prop)
  for _, value in pairs(table) do
    if value == prop then
      return true
    end
  end
  return false, {prop, table}
end

say:set_namespace("en")
say:set("assertion.has_property.positive", "Expected property %s in:\n%s")
say:set("assertion.has_property.negative", "Expected property %s to not be in:\n%s")
assert:register("assertion", "has_property", has_property, "assertion.has_property.positive", "assertion.has_property.negative")

assert.has_property({ name = "jack" }, "name")

Implementation notes:

assertion/modifiers that are Lua keywords (true, false, nil, function, and not) cannot be used using '.' chaining because that results in compilation errors. Instead chain using '_' (underscore) or use one or more capitals in the reserved word (see code examples above), whatever your coding style prefers
assertions same and equal will compare all arguments provided, the other assertions will only take 1 or 2 parameters and ignore all additional arguments

marksands / luassert

Luassert

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