1 files changed, 47 insertions, 0 deletions
diff --git a/spec/models/merge_request_diff_spec.rb b/spec/models/merge_request_diff_spec.rb
new file mode 100644
index 00000000000..3f5763b6408
--- /dev/null
+++ b/spec/models/merge_request_diff_spec.rb
@@ -0,0 +1,47 @@
+require 'spec_helper'
+
+describe MergeRequestDiff, models: true do
+  describe '#diffs' do
+    let(:mr) { create(:merge_request, :with_diffs) }
+    let(:mr_diff) { mr.merge_request_diff }
+
+    context 'when the :ignore_whitespace_change option is set' do
+      it 'creates a new compare object instead of loading from the DB' do
+        expect(mr_diff).not_to receive(:load_diffs)
+        expect(Gitlab::Git::Compare).to receive(:new).and_call_original
+
+        mr_diff.diffs(ignore_whitespace_change: true)
+      end
+    end
+
+    context 'when the raw diffs are empty' do
+      before { mr_diff.update_attributes(st_diffs: '') }
+
+      it 'returns an empty DiffCollection' do
+        expect(mr_diff.diffs).to be_a(Gitlab::Git::DiffCollection)
+        expect(mr_diff.diffs).to be_empty
+      end
+    end
+
+    context 'when the raw diffs exist' do
+      it 'returns the diffs' do
+        expect(mr_diff.diffs).to be_a(Gitlab::Git::DiffCollection)
+        expect(mr_diff.diffs).not_to be_empty
+      end
+
+      context 'when the :paths option is set' do
+        let(:diffs) { mr_diff.diffs(paths: ['.gitignore', 'files/ruby/popen.rb', 'files/ruby/string.rb']) }
+
+        it 'only returns diffs that match the paths given' do
+          expect(diffs.map(&:new_path)).to contain_exactly('.gitignore', 'files/ruby/popen.rb')
+        end
+
+        it 'uses the diffs from the DB' do
+          expect(mr_diff).to receive(:load_diffs)
+
+          diffs
+        end
+      end
+    end
+  end
+end