1 files changed, 13 insertions, 0 deletions
diff --git a/spec/lib/gitlab/diff/file_collection/merge_request_diff_spec.rb b/spec/lib/gitlab/diff/file_collection/merge_request_diff_spec.rb
new file mode 100644
index 00000000000..c863a5f04cc
--- /dev/null
+++ b/spec/lib/gitlab/diff/file_collection/merge_request_diff_spec.rb
@@ -0,0 +1,13 @@
+require 'spec_helper'
+
+describe Gitlab::Diff::FileCollection::MergeRequestDiff do
+  let(:merge_request) { create :merge_request }
+
+  it 'does not hightlight binary files' do
+    allow_any_instance_of(Gitlab::Diff::File).to receive(:blob).and_return(double("text?" => false))
+
+    expect_any_instance_of(Gitlab::Diff::File).not_to receive(:highlighted_diff_lines)
+
+    described_class.new(merge_request.merge_request_diff, diff_options: nil).diff_files
+  end
+end