$ cd blank

$ mkdir .zk/templates

$ echo "# \{{title}}" > .zk/templates/custom.md

# Set a custom template.
$ echo "[note] filename = '\{{slug title}}'\n template = 'custom.md'" > .zk/config.toml

$ zk new --title "A new note" --dry-run
># A new note
2>{{working-dir}}/a-new-note.md

# Template not found.
$ echo "[note] template = 'not-found'" > .zk/config.toml
1$ zk new --dry-run
2>zk: error: new note: load template file failed: cannot find template at not-found