test: return/echo from git helper functions

tests/integration/helpers/git.bash

@@ -48,19 +48,23 @@ _git_commit() {
 _get_tag_hash() {
   tagHash=$(git -C "$ABRA_DIR/recipes/$TEST_RECIPE" rev-list -n 1 "$1")
   assert_success
+  echo "$tagHash"
 }
 
 _get_head_hash() {
   headHash=$(git -C "$ABRA_DIR/recipes/$TEST_RECIPE" show -s --format="%H" HEAD)
   assert_success
+  echo "$headHash"
 }
 
 _get_current_hash() {
   currentHash=$(git -C "$ABRA_DIR/recipes/$TEST_RECIPE" show -s --format="%H")
   assert_success
+  echo "$currentHash"
 }
 
 _get_n_hash() {
   nHash=$(git -C "$ABRA_DIR/recipes/$TEST_RECIPE" show -s --format="%H" "HEAD~$1")
   assert_success
+  echo "$nHash"
 }