--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-rhg.t	Tue Jul 07 14:05:15 2020 +0530
@@ -0,0 +1,26 @@
+#require rust
+
+  $ rhg() {
+  > if [ -f "$RUNTESTDIR/../rust/target/debug/rhg" ]; then
+  >   "$RUNTESTDIR/../rust/target/debug/rhg" "$@"
+  > else
+  >   echo "skipped: Cannot find rhg. Try to run cargo build in rust/rhg."
+  >   exit 80
+  > fi
+  > }
+  $ rhg unimplemented-command
+  [252]
+  $ rhg root
+  abort: no repository found in '$TESTTMP' (.hg not found)!
+  [255]
+  $ hg init repository
+  $ cd repository
+  $ rhg root
+  $TESTTMP/repository
+  $ rhg root > /dev/full
+  abort: No space left on device (os error 28)
+  [255]
+  $ rm -rf `pwd`
+  $ rhg root
+  abort: error getting current working directory: $ENOENT$
+  [255]