Add integration tests

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

tests/int.npp

@@ -0,0 +1,101 @@
+# Int type operator and function tests
+
+# assign
+a = 10
+b = 20
+
+println(a)
+println(b)
+
+# __add__
+println("__add__")
+println(1 + 1)
+println(1 + 2 + 3)
+println(1938 + 481)
+println(a + b)
+println(b + a)
+
+# __sub__
+println("__sub__")
+println(1 - 2)
+println(2 - 1)
+println(0 - 10)
+println(185 - 86171)
+println(a - b)
+println(b - a)
+
+# __mul__
+println("__mul__")
+println(1 * 1)
+println(1 * -1)
+println(-1 * 1)
+println(0 * -1)
+println(-1 * 0)
+println(2 * 32768)
+println(2 * 2 * 2 * 2)
+println(999 * 999)
+println(a * b)
+println(a * a * b * b)
+
+# __div__
+println("__div__")
+println(1 / 1)
+println(1 / 2)
+println(2 / 1)
+println(363 / 3)
+println(3 / 363)
+println(a / b)
+println(b / a)
+
+# __gt__
+println("__gt__")
+println(1 > 2)
+println(2 > 1)
+println(5831 > -391)
+println(-34888 > 1000)
+println(1 > 1)
+println(2 > 2)
+
+# __ge__
+println("__ge__")
+println(1 >= 2)
+println(2 >= 1)
+println(81001 >= 81001)
+println(-81001 >= 1000)
+println(1 >= 1)
+println(2 >= 2)
+
+# __lt__
+println("__lt__")
+println(1 < 2)
+println(2 < 1)
+println(81001 < 81001)
+println(-81001 < 1000)
+println(1 < 1)
+println(2 < 2)
+
+# __le__
+println("__le__")
+println(1 <= 2)
+println(2 <= 1)
+println(81001 <= 81001)
+println(-81001 <= 1000)
+println(1 <= 1)
+println(2 <= 2)
+
+# __pos__
+println("__pos__")
+println(+1)
+println(+(-1))
+println(+(10 - 20))
+println(+(20 - 10))
+
+# __neg__
+println("__neg__")
+println(-1)
+println(--1)
+println(---1)
+println(----1)
+println(10 - -20)
+println(-10 - 20)
+println(-10 - -20)