Start tests;

tests/lust.lua

@@ -0,0 +1,180 @@
+-- lust - Lua test framework
+-- https://github.com/bjornbytes/lust
+-- License - MIT, see LICENSE for details.
+
+local lust = {}
+lust.level = 0
+lust.passes = 0
+lust.errors = 0
+lust.befores = {}
+lust.afters = {}
+
+local red = string.char(27) .. '[31m'
+local green = string.char(27) .. '[32m'
+local normal = string.char(27) .. '[0m'
+local function indent(level) return string.rep('\t', level or lust.level) end
+
+function lust.describe(name, fn)
+  print(indent() .. name)
+  lust.level = lust.level + 1
+  fn()
+  lust.befores[lust.level] = {}
+  lust.afters[lust.level] = {}
+  lust.level = lust.level - 1
+end
+
+function lust.it(name, fn)
+  for level = 1, lust.level do
+    if lust.befores[level] then
+      for i = 1, #lust.befores[level] do
+        lust.befores[level][i](name)
+      end
+    end
+  end
+
+  local success, err = pcall(fn)
+  if success then lust.passes = lust.passes + 1
+  else lust.errors = lust.errors + 1 end
+  local color = success and green or red
+  local label = success and 'PASS' or 'FAIL'
+  print(indent() .. color .. label .. normal .. ' ' .. name)
+  if err then
+    print(indent(lust.level + 1) .. red .. err .. normal)
+  end
+
+  for level = 1, lust.level do
+    if lust.afters[level] then
+      for i = 1, #lust.afters[level] do
+        lust.afters[level][i](name)
+      end
+    end
+  end
+end
+
+function lust.before(fn)
+  lust.befores[lust.level] = lust.befores[lust.level] or {}
+  table.insert(lust.befores[lust.level], fn)
+end
+
+function lust.after(fn)
+  lust.afters[lust.level] = lust.afters[lust.level] or {}
+  table.insert(lust.afters[lust.level], fn)
+end
+
+-- Assertions
+local function isa(v, x)
+  if type(x) == 'string' then return type(v) == x, tostring(v) .. ' is not a ' .. x
+  elseif type(x) == 'table' then
+    if type(v) ~= 'table' then return false, tostring(v) .. ' is not a ' .. tostring(x) end
+    local seen = {}
+    local meta = v
+    while meta and not seen[meta] do
+      if meta == x then return true end
+      seen[meta] = true
+      meta = getmetatable(meta) and getmetatable(meta).__index
+    end
+    return false, tostring(v) .. ' is not a ' .. tostring(x)
+  end
+  return false, 'invalid type ' .. tostring(x)
+end
+
+local function has(t, x)
+  for k, v in pairs(t) do
+    if v == x then return true end
+  end
+  return false
+end
+
+local function strict_eq(t1, t2)
+  if type(t1) ~= type(t2) then return false end
+  if type(t1) ~= 'table' then return t1 == t2 end
+  if #t1 ~= #t2 then return false end
+  for k, _ in pairs(t1) do
+    if not strict_eq(t1[k], t2[k]) then return false end
+  end
+  for k, _ in pairs(t2) do
+    if not strict_eq(t2[k], t1[k]) then return false end
+  end
+  return true
+end
+
+local paths = {
+  [''] = {'to', 'to_not'},
+  to = {'have', 'equal', 'be', 'exist', 'fail'},
+  to_not = {'have', 'equal', 'be', 'exist', 'fail', chain = function(a) a.negate = not a.negate end},
+  be = {'a', 'an', 'truthy', 'falsy', f = function(v, x)
+    return v == x, tostring(v) .. ' and ' .. tostring(x) .. ' are not equal'
+  end},
+  a = {f = isa},
+  an = {f = isa},
+  exist = {f = function(v) return v ~= nil, tostring(v) .. ' is nil' end},
+  truthy = {f = function(v) return v, tostring(v) .. ' is not truthy' end},
+  falsy = {f = function(v) return not v, tostring(v) .. ' is not falsy' end},
+  equal = {f = function(v, x) return strict_eq(v, x), tostring(v) .. ' and ' .. tostring(x) .. ' are not strictly equal' end},
+  have = {
+    f = function(v, x)
+      if type(v) ~= 'table' then return false, 'table "' .. tostring(v) .. '" is not a table' end
+      return has(v, x), 'table "' .. tostring(v) .. '" does not have ' .. tostring(x)
+    end
+  },
+  fail = {f = function(v) return not pcall(v), tostring(v) .. ' did not fail' end}
+}
+
+function lust.expect(v)
+  local assertion = {}
+  assertion.val = v
+  assertion.action = ''
+  assertion.negate = false
+
+  setmetatable(assertion, {
+    __index = function(t, k)
+      if has(paths[rawget(t, 'action')], k) then
+        rawset(t, 'action', k)
+        local chain = paths[rawget(t, 'action')].chain
+        if chain then chain(t) end
+        return t
+      end
+      return rawget(t, k)
+    end,
+    __call = function(t, ...)
+      if paths[t.action].f then
+        local res, err = paths[t.action].f(t.val, ...)
+        if assertion.negate then res = not res end
+        if not res then
+          error(err or 'unknown failure', 2)
+        end
+      end
+    end
+  })
+
+  return assertion
+end
+
+function lust.spy(target, name, run)
+  local spy = {}
+  local subject
+
+  local function capture(...)
+    table.insert(spy, {...})
+    return subject(...)
+  end
+
+  if type(target) == 'table' then
+    subject = target[name]
+    target[name] = capture
+  else
+    run = name
+    subject = target or function() end
+  end
+
+  setmetatable(spy, {__call = function(_, ...) return capture(...) end})
+
+  if run then run() end
+
+  return spy
+end
+
+lust.test = lust.it
+lust.paths = paths
+
+return lust

tests/parse.lua

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+local parse = require 'parse'
+
+describe('parse', function()
+  it('errors if passed nil', function()
+    expect(function() parse(nil) end).to.fail()
+  end)
+
+  it('returns a document with no definitions if passed an empty string', function()
+    expect(parse('')).to.equal({
+      kind = 'document',
+      definitions = {}
+    })
+  end)
+end)

tests/runner.lua

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+lust = require 'tests/lust'
+
+for _, fn in pairs({'describe', 'it', 'test', 'expect', 'spy', 'before', 'after'}) do
+  _G[fn] = lust[fn]
+end
+
+local files = {
+  'parse'
+}
+
+for i, file in ipairs(files) do
+  dofile('tests/' .. file .. '.lua')
+  if next(files, i) then
+    print()
+  end
+end
+
+local red = string.char(27) .. '[31m'
+local green = string.char(27) .. '[32m'
+local normal = string.char(27) .. '[0m'
+
+if lust.errors > 0 then
+  io.write(red .. lust.errors .. normal .. ' failed, ')
+end
+
+print(green .. lust.passes .. normal .. ' passed')
+
+if lust.errors > 0 then os.exit(1) end