Bug #1251

- #1251 tests should sanitize TASKDATA and TASKRC env vars (thanks to Jakub
  Wilk).

test/t.t.cpp

@@ -26,6 +26,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 
 #include <cmake.h>
+#include <stdlib.h>
 #include <main.h>
 #include <test.h>
 
@@ -36,6 +37,10 @@ int main (int argc, char** argv)
 {
   UnitTest test (30);
 
+  // Ensure environment has no influence.
+  unsetenv ("TASKDATA");
+  unsetenv ("TASKRC");
+
   test.is ((int)Task::textToStatus ("pending"),   (int)Task::pending,   "textToStatus pending");
   test.is ((int)Task::textToStatus ("completed"), (int)Task::completed, "textToStatus completed");
   test.is ((int)Task::textToStatus ("deleted"),   (int)Task::deleted,   "textToStatus deleted");