Close TD-16 frontmatter robustness

test/bds/frontmatter_test.exs

@@ -0,0 +1,30 @@
+defmodule BDS.FrontmatterTest do
+  use ExUnit.Case, async: true
+
+  test "parse_document accepts CRLF frontmatter documents" do
+    contents = "---\r\ntitle: Hello\r\ntags:\r\n  - elixir\r\n---\r\nBody\r\n"
+
+    assert {:ok, %{fields: fields, body: body}} = BDS.Frontmatter.parse_document(contents)
+    assert fields["title"] == "Hello"
+    assert fields["tags"] == ["elixir"]
+    assert body == "Body"
+  end
+
+  test "serialize_document roundtrips quoted strings with embedded quotes and escapes" do
+    fields = [
+      {"title", "He said \"hi\" \\\\ there"},
+      {"summary", "Ends with a quote\""},
+      {"excerpt", "first line\nsecond line"}
+    ]
+
+    contents = BDS.Frontmatter.serialize_document(fields, "Body")
+
+    assert {:ok, %{fields: parsed_fields, body: body}} =
+             BDS.Frontmatter.parse_document(contents)
+
+    assert parsed_fields["title"] == "He said \"hi\" \\\\ there"
+    assert parsed_fields["summary"] == "Ends with a quote\""
+    assert parsed_fields["excerpt"] == "first line\nsecond line"
+    assert body == "Body"
+  end
+end