Adding a test case for getcwd and related functions.

src/test/run-pass/lib-path.rs

@@ -0,0 +1,17 @@
+// xfail-stage0
+
+// Testing a few of the path manipuation functions
+
+use std;
+
+import std::fs;
+import std::os;
+
+fn main() {
+  assert(!fs::path_is_absolute("test-path"));
+
+  log "Current working directory: " + os::getcwd();
+
+  log fs::make_absolute("test-path");
+  log fs::make_absolute("/usr/bin");
+}