test(app new): cover a commit that only exists on another branch

tests/integration/app_new.bats

@@ -122,6 +122,39 @@ teardown(){
   assert_failure
 }
 
+@test "create new app with commit from another branch" {
+  branchHash=$(_get_other_branch_hash)
+  if [[ -z "$branchHash" ]]; then
+    skip "$TEST_RECIPE has no branch besides main"
+  fi
+
+  # re-clone the recipe the way an older abra did, with a single-branch refspec. --no-local
+  # forces a real transfer, a local clone would hardlink the whole object database and leave
+  # the commit reachable
+  run rm -rf "$ABRA_DIR/recipes/$TEST_RECIPE"
+  assert_success
+
+  run git clone -q --no-local --single-branch --branch main \
+    "$ABRA_DIR/origin-recipes/$TEST_RECIPE.git" "$ABRA_DIR/recipes/$TEST_RECIPE"
+  assert_success
+
+  # the commit has to be genuinely missing, otherwise this test passes for the wrong reason
+  run git -C "$ABRA_DIR/recipes/$TEST_RECIPE" rev-parse --verify "$branchHash^{commit}"
+  assert_failure
+
+  run $ABRA app new "$TEST_RECIPE" "$branchHash" \
+    --no-input \
+    --server "$TEST_SERVER" \
+    --domain "$TEST_APP_DOMAIN"
+  assert_success
+  assert_exists "$ABRA_DIR/servers/$TEST_SERVER/$TEST_APP_DOMAIN.env"
+
+  # the recipe names itself in TYPE, which differs per branch, so only the version is checked
+  run grep -q "TYPE=.*:${branchHash}$" \
+    "$ABRA_DIR/servers/$TEST_SERVER/$TEST_APP_DOMAIN.env"
+  assert_success
+}
+
 @test "does not overwrite existing env files" {
   run $ABRA app new "$TEST_RECIPE" \
     --no-input \

tests/integration/helpers/git.bash

@@ -56,6 +56,13 @@ _get_tag_hash() {
   echo $(git -C "$ABRA_DIR/recipes/$TEST_RECIPE" rev-list -n 1 "$1")
 }
 
+_get_other_branch_hash() {
+  # asked from the origin mirror, not from the recipe checkout, so that the result does not
+  # depend on what has been fetched. empty when the recipe only has a default branch
+  echo $(git ls-remote "$ABRA_DIR/origin-recipes/$TEST_RECIPE.git" \
+    | grep 'refs/heads/' | grep -v 'refs/heads/main$' | head -1 | cut -f1)
+}
+
 _get_head_hash() {
   echo $(git -C "$ABRA_DIR/recipes/$TEST_RECIPE" show -s --format="%H" HEAD)
 }