1 files changed, 51 insertions, 0 deletions
diff --git a/spec/lib/gitlab/word_diff/segments/diff_hunk_spec.rb b/spec/lib/gitlab/word_diff/segments/diff_hunk_spec.rb
new file mode 100644
index 00000000000..5250e6d73c2
--- /dev/null
+++ b/spec/lib/gitlab/word_diff/segments/diff_hunk_spec.rb
@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::WordDiff::Segments::DiffHunk do
+  subject(:diff_hunk) { described_class.new(line) }
+
+  let(:line) { '@@ -3,14 +4,13 @@' }
+
+  describe '#pos_old' do
+    subject { diff_hunk.pos_old }
+
+    it { is_expected.to eq 3 }
+
+    context 'when diff hunk is broken' do
+      let(:line) { '@@ ??? @@' }
+
+      it { is_expected.to eq 0 }
+    end
+  end
+
+  describe '#pos_new' do
+    subject { diff_hunk.pos_new }
+
+    it { is_expected.to eq 4 }
+
+    context 'when diff hunk is broken' do
+      let(:line) { '@@ ??? @@' }
+
+      it { is_expected.to eq 0 }
+    end
+  end
+
+  describe '#first_line?' do
+    subject { diff_hunk.first_line? }
+
+    it { is_expected.to be_falsey }
+
+    context 'when diff hunk located on the first line' do
+      let(:line) { '@@ -1,14 +1,13 @@' }
+
+      it { is_expected.to be_truthy }
+    end
+  end
+
+  describe '#to_s' do
+    subject { diff_hunk.to_s }
+
+    it { is_expected.to eq(line) }
+  end
+end