Add some minor tests of Lua library

scripts/math.lua

@@ -0,0 +1,10 @@
+-- Copyright (C) 2018  David Capello
+--
+-- This file is released under the terms of the MIT license.
+-- Read LICENSE.txt for more information.
+
+assert(100 == math.abs(-100))
+assert(100 == math.min(100, 200, 300))
+assert(300 == math.max(100, 200, 300))
+assert(50 == math.fmod(250, 100))
+assert(3141 == math.floor(1000*math.pi))

scripts/os.lua

@@ -0,0 +1,14 @@
+-- Copyright (C) 2018  David Capello
+--
+-- This file is released under the terms of the MIT license.
+-- Read LICENSE.txt for more information.
+
+assert("" ~= os.getenv("PATH"))
+print("PATH", os.getenv("PATH"))
+
+local start_clock = os.clock()
+print("Start ", start_clock)
+
+local end_clock = os.clock()
+print("End ", end_clock, " Elapsed ", end_clock - start_clock)
+assert(start_clock < end_clock)

scripts/string.lua

@@ -0,0 +1,23 @@
+-- Copyright (C) 2018  David Capello
+--
+-- This file is released under the terms of the MIT license.
+-- Read LICENSE.txt for more information.
+
+assert(72 == string.byte("Hello", 1))
+assert(101 == string.byte("Hello", 2))
+assert(111 == string.byte("Hello", 5))
+assert("Hello" == string.char(72, 101, 108, 108, 111))
+
+local s = "Hello"
+assert(111 == s:byte(5))
+assert(5 == string.len(s))
+assert("olleH" == string.reverse(s))
+assert("hello" == string.lower(s))
+assert("HELLO" == string.upper(s))
+
+assert("Simple int 32" == string.format("Simple int %d", 32))
+assert("Simple int 0032" == string.format("Simple int %04d", 32))
+
+assert(7 == string.find("Hello World!", "W"))
+
+assert("-- hi 1000 --" == string.format("-- %s %d --", "hi", 1000))