1 files changed, 26 insertions, 0 deletions
diff --git a/spec/lib/banzai/filter/normalize_source_filter_spec.rb b/spec/lib/banzai/filter/normalize_source_filter_spec.rb
new file mode 100644
index 00000000000..8eaeec0e7b0
--- /dev/null
+++ b/spec/lib/banzai/filter/normalize_source_filter_spec.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Banzai::Filter::NormalizeSourceFilter do
+  include FilterSpecHelper
+
+  it 'removes the UTF8 BOM from the beginning of the text' do
+    content = "\xEF\xBB\xBF---"
+
+    output = filter(content)
+
+    expect(output).to match '---'
+  end
+
+  it 'does not remove those characters from anywhere else in the text' do
+    content = <<~MD
+      \xEF\xBB\xBF---
+      \xEF\xBB\xBF---
+    MD
+
+    output = filter(content)
+
+    expect(output).to match "---\n\xEF\xBB\xBF---\n"
+  end
+end