fix: pretty-print json on serialisation to filesystem

test/bds/metadata_test.exs

@@ -99,6 +99,10 @@ defmodule BDS.MetadataTest do
     category_meta_path = Path.join([temp_dir, "meta", "category-meta.json"])
     publishing_path = Path.join([temp_dir, "meta", "publishing.json"])
 
+    assert File.read!(categories_path) =~ "\n"
+    assert File.read!(category_meta_path) =~ "\n"
+    assert File.read!(publishing_path) =~ "\n"
+
     assert ["article", "aside", "news", "page", "picture"] =
              Jason.decode!(File.read!(categories_path))
 

test/bds/tags_test.exs

@@ -30,8 +30,12 @@ defmodule BDS.TagsTest do
     tags_path = Path.join([temp_dir, "meta", "tags.json"])
     assert File.exists?(tags_path)
 
+    contents = File.read!(tags_path)
+    assert contents =~ "\n"
+    refute String.contains?(contents, "}],[")
+
     assert [%{"name" => "Alpha"}, %{"color" => "#000000", "name" => "Zebra"}] =
-             Jason.decode!(File.read!(tags_path))
+             Jason.decode!(contents)
   end
 
   test "create_tag rejects case-insensitive duplicates per project", %{project: project} do