add tests

test/feed_reader/collector_test.exs

@@ -56,6 +56,10 @@ defmodule FeedReader.CollectorTest do
              FeedReader.parse_binary(@xml <> "<broken", max_items: 2)
   end
 
+  test "rejects non-whitespace content before the XML document" do
+    assert {:error, _reason} = FeedReader.parse_binary("junk" <> @xml, max_items: 2)
+  end
+
   test "rejects invalid chunks and binary arguments" do
     assert {:error, :invalid_chunk} =
              FeedReader.parse_stream([@xml, 123], max_items: 2)

test/feed_reader/streaming_test.exs

@@ -24,8 +24,8 @@ defmodule FeedReader.StreamingTest do
     assert File.read!(path) == @xml
   end
 
-  test "ignores a UTF-8 BOM split across input chunks" do
+  test "ignores a BOM and XML whitespace split across input chunks" do
-    xml = <<0xEF, 0xBB, 0xBF>> <> @xml
+    xml = <<0xEF, 0xBB, 0xBF, 32, 9, 13, 10>> <> ~s(<?xml version="1.0"?>) <> @xml
     path = write_temp(xml)
 
     on_exit(fn -> File.rm(path) end)