new tester; all tests categorized

tests/overflw/toverflw.nim

@@ -0,0 +1,21 @@
+discard """
+  file: "toverflw.nim"
+  output: "the computation overflowed"
+"""
+# Tests nimrod's ability to detect overflows
+
+{.push overflowChecks: on.}
+
+var
+  a, b: int
+a = high(int)
+b = -2
+try:
+  writeln(stdout, b - a)
+except EOverflow:
+  writeln(stdout, "the computation overflowed")
+
+{.pop.} # overflow check
+#OUT the computation overflowed
+
+

tests/overflw/toverflw2.nim

@@ -0,0 +1,10 @@
+discard """
+  file: "toverflw2.nim"
+  outputsub: "Error: unhandled exception: over- or underflow [EOverflow]"
+  exitcode: "1"
+"""
+var a : int32 = 2147483647
+var b : int32 = 2147483647
+var c = a + b
+
+

tests/overflw/tovfint.nim

@@ -0,0 +1,23 @@
+discard """
+  file: "tovfint.nim"
+  output: "works!"
+"""
+# this tests the new overflow literals
+
+var
+  i: int
+i = int(0xffffffff'i32)
+when defined(cpu64):
+  if i == -1:
+    write(stdout, "works!\n")
+  else:
+    write(stdout, "broken!\n")
+else:
+  if i == -1:
+    write(stdout, "works!\n")
+  else:
+    write(stdout, "broken!\n")
+
+#OUT works!
+
+