activated more tests, allow input in test spec

tests/osproc/ta_out.nim

@@ -1,3 +1,14 @@
+discard """
+output: '''
+to stdout
+to stdout
+to stderr
+to stderr
+to stdout
+to stdout
+'''
+"""
+
 # This file is prefixed with an "a", because other tests
 # depend on it and it must be compiled first.
 stdout.writeLine("to stdout")

tests/osproc/tafalse.nim

@@ -1,3 +1,7 @@
+discard """
+exitcode: 1
+"""
+
 # 'tafalse.nim' to ensure it is compiled before texitcode.nim
 import system
 quit(QuitFailure)

tests/osproc/texitcode.nim

@@ -2,6 +2,7 @@ discard """
   file: "texitcode.nim"
   output: ""
 """
+
 import osproc, os
 
 const filename = when defined(Windows): "tafalse.exe" else: "tafalse"