diff --git a/spec/helpers/diff_helper_spec.rb b/spec/helpers/diff_helper_spec.rb
index 955d2852cfd..14986a74c2e 100644
--- a/spec/helpers/diff_helper_spec.rb
+++ b/spec/helpers/diff_helper_spec.rb
@@ -104,8 +104,7 @@ describe DiffHelper do
     end
   end
 
-  describe 'diff_line_content' do
-
+  describe '#diff_line_content' do
     it 'should return non breaking space when line is empty' do
       expect(diff_line_content(nil)).to eq('  ')
     end
@@ -116,9 +115,19 @@ describe DiffHelper do
       expect(diff_line_content(diff_file.diff_lines.first.type)).to eq('match')
       expect(diff_file.diff_lines.first.new_pos).to eq(6)
     end
+  end
 
-    it 'should return safe HTML' do
-      expect(diff_line_content(diff_file.diff_lines.first.text)).to be_html_safe
+  describe "#mark_inline_diffs" do
+    let(:old_line) { %{abc 'def'} }
+    let(:new_line) { %{abc "def"} }
+
+    it "returns strings with marked inline diffs" do
+      marked_old_line, marked_new_line = mark_inline_diffs(old_line, new_line)
+
+      expect(marked_old_line).to eq("abc <span class='idiff left right'>&#39;def&#39;</span>")
+      expect(marked_old_line).to be_html_safe
+      expect(marked_new_line).to eq("abc <span class='idiff left right'>&quot;def&quot;</span>")
+      expect(marked_new_line).to be_html_safe
     end
   end
 end
diff --git a/spec/lib/gitlab/diff/highlight_spec.rb b/spec/lib/gitlab/diff/highlight_spec.rb
index deab16714e0..d19bf4ac84b 100644
--- a/spec/lib/gitlab/diff/highlight_spec.rb
+++ b/spec/lib/gitlab/diff/highlight_spec.rb
@@ -40,38 +40,38 @@ describe Gitlab::Diff::Highlight, lib: true do
       end
     end
 
-      context "with diff lines" do
-        let(:subject) { Gitlab::Diff::Highlight.new(diff_file.diff_lines).highlight }
+    context "with diff lines" do
+      let(:subject) { Gitlab::Diff::Highlight.new(diff_file.diff_lines).highlight }
 
-        it 'should return Gitlab::Diff::Line elements' do
-          expect(subject.first).to be_an_instance_of(Gitlab::Diff::Line)
-        end
-
-        it 'should not modify "match" lines' do
-          expect(subject[0].text).to eq('@@ -6,12 +6,18 @@ module Popen')
-          expect(subject[22].text).to eq('@@ -19,6 +25,7 @@ module Popen')
-        end
-
-        it 'marks unchanged lines' do
-          code = %Q{   def popen(cmd, path=nil)}
-
-          expect(subject[2].text).to eq(code)
-          expect(subject[2].text).not_to be_html_safe
-        end
-
-        it 'marks removed lines' do
-          code = %Q{-      raise "System commands must be given as an array of strings"}
-
-          expect(subject[4].text).to eq(code)
-          expect(subject[4].text).not_to be_html_safe
-        end
-
-        it 'marks added lines' do
-          code = %Q{+      raise <span class='idiff left right'>RuntimeError, </span>&quot;System commands must be given as an array of strings&quot;}
-
-          expect(subject[5].text).to eq(code)
-          expect(subject[5].text).to be_html_safe
-        end
+      it 'should return Gitlab::Diff::Line elements' do
+        expect(subject.first).to be_an_instance_of(Gitlab::Diff::Line)
       end
+
+      it 'should not modify "match" lines' do
+        expect(subject[0].text).to eq('@@ -6,12 +6,18 @@ module Popen')
+        expect(subject[22].text).to eq('@@ -19,6 +25,7 @@ module Popen')
+      end
+
+      it 'marks unchanged lines' do
+        code = %Q{   def popen(cmd, path=nil)}
+
+        expect(subject[2].text).to eq(code)
+        expect(subject[2].text).not_to be_html_safe
+      end
+
+      it 'marks removed lines' do
+        code = %Q{-      raise "System commands must be given as an array of strings"}
+
+        expect(subject[4].text).to eq(code)
+        expect(subject[4].text).not_to be_html_safe
+      end
+
+      it 'marks added lines' do
+        code = %Q{+      raise <span class='idiff left right'>RuntimeError, </span>&quot;System commands must be given as an array of strings&quot;}
+
+        expect(subject[5].text).to eq(code)
+        expect(subject[5].text).to be_html_safe
+      end
+    end
   end
 end