test/system: Test the order in 'list' for images with & without names

Note that 'run --keep-empty-lines' counts the trailing newline on the
last line as a separate line.

Until Bats 1.7.0, 'run --keep-empty-lines' had a bug where even when a
command produced no output, it would report a line count of one [1] due
to a stray line feed character.  This needs to be conditionalized, since
Fedora 35 has Bats 1.5.0.

[1] https://github.com/bats-core/bats-core/issues/573

https://github.com/containers/toolbox/pull/1192

test/system/102-list.bats

@@ -107,3 +107,23 @@ teardown() {
   assert_line --index 6 --partial "non-default-one"
   assert_line --index 7 --partial "non-default-two"
 }
+
+@test "list: Images with and without names" {
+  local default_image
+  default_image="$(get_default_image)"
+
+  pull_default_image
+  pull_distro_image fedora 34
+  build_image_without_name
+
+  run --keep-empty-lines --separate-stderr "$TOOLBOX" list --images
+
+  assert_success
+  assert_line --index 1 --partial "<none>"
+  assert_line --index 2 --partial "$default_image"
+  assert_line --index 3 --partial "fedora-toolbox:34"
+  assert [ ${#lines[@]} -eq 5 ]
+  if check_bats_version 1.7.0; then
+    assert [ ${#stderr_lines[@]} -eq 0 ]
+  fi
+}

test/system/libs/helpers.bash

@@ -239,6 +239,36 @@ function build_image_without_name() {
 }
 
 
+function check_bats_version() {
+    local required_version
+    required_version="$1"
+
+    if ! old_version=$(printf "%s\n%s\n" "$BATS_VERSION" "$required_version" | sort --version-sort | head --lines 1); then
+        return 1
+    fi
+
+    if [ "$required_version" = "$old_version" ]; then
+        return 0
+    fi
+
+    return 1
+}
+
+
+function get_default_image() {
+  local distro
+  local image
+  local release
+
+  distro="$(get_system_id)"
+  release="$(get_system_version)"
+  image="${IMAGES[$distro]}:$release"
+
+  echo "$image"
+  return 0
+}
+
+
 # Copies an image from local storage to Podman's image store
 #
 # Call before creating any container. Network failures are not nice.