diff --git a/test/test.lua b/test/test.lua
new file mode 100644
index 0000000..507c60a
--- /dev/null
+++ b/test/test.lua
@@ -0,0 +1,227 @@
+
+local json = loadfile("../json.lua")()
+
+
+local fmt = string.format
+
+local function test(name, func)
+  xpcall(function()
+    func()
+    print( fmt("[pass] %s", name) )
+  end, function(err)
+    print( fmt("[fail] %s : %s", name, err) )
+  end)
+end
+
+
+local function equal(a, b)
+  -- Handle table
+  if type(a) == "table" and type(b) == "table" then
+    for k in pairs(a) do
+      if not equal(a[k], b[k]) then
+        return false
+      end
+    end
+    for k in pairs(b) do
+      if not equal(b[k], a[k]) then
+        return false
+      end
+    end
+    return true
+  end
+  -- Handle scalar
+  return a == b
+end
+
+
+test("numbers", function()
+  local t = {
+    [ "123.456"   ] = 123.456,
+    [ "-123"      ] = -123,
+    [ "-567.765"  ] = -567.765,
+    [ "12.3"      ] = 12.3,
+    [ "0"         ] = 0,
+  }
+  for k, v in pairs(t) do
+    local res = json.decode(k)
+    assert( res == v, fmt("expected '%s', got '%s'", k, res) )
+    local res = json.encode(v)
+    assert( res == k, fmt("expected '%s', got '%s'", v, res) )
+  end
+  assert( json.decode("13e2") == 13e2 )
+  assert( json.decode("13E+2") == 13e2 )
+  assert( json.decode("13e-2") == 13e-2 )
+end)
+
+
+test("keywords", function()
+  assert( json.decode("true") == true )
+  assert( json.encode(true) == "true" ) 
+  assert( json.decode("false") == false )
+  assert( json.encode(false) == "false" )
+  assert( json.decode("null") == nil )
+  assert( json.encode(nil) == "null")
+end)
+
+
+test("strings", function()
+  local s = "Hello world"
+  assert( s == json.decode( json.encode(s) ) )
+  local s = "\0 \13 \27"
+  assert( s == json.decode( json.encode(s) ) )
+end)
+
+
+test("unicode", function()
+  local s = "こんにちは世界"
+  assert( s == json.decode( json.encode(s) ) )
+end)
+
+
+test("arrays", function()
+  local t = { "cat", "dog", "owl" }
+  assert( equal( t, json.decode( json.encode(t) ) ) )
+end)
+
+
+test("objects", function()
+  local t = { x = 10, y = 20, z = 30 }
+  assert( equal( t, json.decode( json.encode(t) ) ) )
+end)
+
+
+test("strict decode", function()
+  local t = {
+    '{x : 1}',
+    '{x : hello}',
+    "{'x' : 1}",
+    '{"x" : nil}',
+    '{"x" : 0x10}',
+    '{"x" : 1, }',
+    '[1, 2, 3, ]'
+  }
+  for i, v in ipairs(t) do
+    local status = pcall(json.decode, v)
+    assert( not status, fmt("'%s' was parsed without error", v) )
+  end
+end)
+
+
+test("decode invalid", function()
+  local t = {
+    '',
+    ' ',
+    '{',
+    '[',
+    '{"x" : ',
+    '{"x" : 1',
+    '{"x" : z }',
+    '{"x" : 123z }',
+    '{x : 123 }',
+    '{10 : 123 }',
+    '{]',
+    '[}',
+    '"a',
+  }
+  for i, v in ipairs(t) do
+    local status = pcall(json.decode, v)
+    assert( not status, fmt("'%s' was parsed without error", v) )
+  end
+end)
+
+
+test("decode invalid escape", function()
+  local t = {
+    [["\z"]],
+    [["\1"]],
+    [["\u000z"]],
+    [["\ud83d\ude0q"]]
+  }
+  for i, v in ipairs(t) do
+    local status, err = pcall(json.decode, v)
+    assert( not status, fmt("'%s' was parsed without error", v) )
+  end
+end)
+
+
+test("decode escape", function()
+  local t = {
+    [ [["\u263a"]]        ] = '☺',
+    [ [["\ud83d\ude02"]]  ] = '😂',
+    [ [["\r\n\t\\\""]]    ] = '\r\n\t\\"',
+  }
+  for k, v in pairs(t) do
+    local res = json.decode(k)
+    assert( res == v, fmt("expected '%s', got '%s'", v, res) )
+  end
+end)
+
+
+test("decode empty", function()
+  local t = {
+    [ '[]' ] = {},
+    [ '{}' ] = {},
+    [ '""' ] = "",
+  }
+  for k, v in pairs(t) do
+    local res = json.decode(k)
+    assert( equal(res, v), fmt("'%s' did not equal expected", k) )
+  end
+end)
+
+
+test("decode collection", function()
+  local t = {
+    [ '[1, 2, 3, 4, 5, 6]'            ] = {1, 2, 3, 4, 5, 6},
+    [ '[1, 2, 3, "hello"]'            ] = {1, 2, 3, "hello"},
+    [ '{ "name": "test", "id": 231 }' ] = {name = "test", id = 231},
+    [ '{"x":1,"y":2,"z":[1,2,3]}'     ] = {x = 1, y = 2, z = {1, 2, 3}},
+  }
+  for k, v in pairs(t) do
+    local res = json.decode(k)
+    assert( equal(res, v), fmt("'%s' did not equal expected", k) )
+  end
+end)
+
+
+test("encode invalid", function()
+  local t = {
+    { [1000] = "b" },
+    { [ function() end ] = 12 },
+    { nil, 2, 3, 4 },
+  }
+  for i, v in ipairs(t) do
+    local status, res = pcall(json.encode, v)
+    assert( not status, fmt("encoding '%s' did not result in an error", v) )
+  end
+end)
+
+
+test("encode invalid number", function()
+  local t = {
+    math.huge,      -- inf
+    -math.huge,     -- -inf
+    math.huge * 0,  -- NaN
+  }
+  for i, v in ipairs(t) do
+    local status, res = pcall(json.encode, v)
+    assert( not status, fmt("encoding '%s' did not result in an error", v) )
+  end
+end)
+
+
+test("encode escape", function()
+  local t = {
+    [ '"x"'       ] = [["\"x\""]],
+    [ 'x\ny'      ] = [["x\ny"]],
+    [ 'x\0y'      ] = [["x\u0000y"]],
+    [ 'x\27y'     ] = [["x\u001by"]],
+    [ '\r\n\t\\"' ] = [["\r\n\t\\\""]],
+  }
+  for k, v in pairs(t) do
+    local res = json.encode(k)
+    assert( res == v, fmt("'%s' was not escaped properly", k) )
+  end
+end)
+
+