1 files changed, 49 insertions, 0 deletions
diff --git a/internal/gitutil/diff_test.go b/internal/gitutil/diff_test.go
new file mode 100644
index 00000000..b651b088
--- /dev/null
+++ b/internal/gitutil/diff_test.go
@@ -0,0 +1,49 @@
+// Copyright 2016 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package gitutil
+
+import (
+	"html/template"
+	"testing"
+
+	dmp "github.com/sergi/go-diff/diffmatchpatch"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/gogs/git-module"
+)
+
+func Test_diffsToHTML(t *testing.T) {
+	tests := []struct {
+		diffs    []dmp.Diff
+		lineType git.DiffLineType
+		expHTML  template.HTML
+	}{
+		{
+			diffs: []dmp.Diff{
+				{Type: dmp.DiffEqual, Text: "foo "},
+				{Type: dmp.DiffInsert, Text: "bar"},
+				{Type: dmp.DiffDelete, Text: " baz"},
+				{Type: dmp.DiffEqual, Text: " biz"},
+			},
+			lineType: git.DiffLineAdd,
+			expHTML:  template.HTML(`+ foo <span class="added-code">bar</span> biz`),
+		},
+		{
+			diffs: []dmp.Diff{
+				{Type: dmp.DiffEqual, Text: "foo "},
+				{Type: dmp.DiffDelete, Text: "bar"},
+				{Type: dmp.DiffInsert, Text: " baz"},
+				{Type: dmp.DiffEqual, Text: " biz"},
+			},
+			lineType: git.DiffLineDelete,
+			expHTML:  template.HTML(`- foo <span class="removed-code">bar</span> biz`),
+		},
+	}
+	for _, test := range tests {
+		t.Run("", func(t *testing.T) {
+			assert.Equal(t, test.expHTML, diffsToHTML(test.diffs, test.lineType))
+		})
+	}
+}