fixed cargo test

ci/run-cargo-test.sh

@@ -3,10 +3,8 @@
 ERROR=0
 
 while IFS= read -r -d '' f; do
-  dir="$(dirname "${f}")"
-
-  echo "run 'cargo test' in ${dir}"
-  cd "${dir}" && cargo test
+  echo "run 'cargo test' with ${f}"
+  cargo test --manifest-path="${f}"
 
   if [[ $? -ne 0 ]]; then
     ERROR=1