1 files changed, 62 insertions, 3 deletions
diff --git a/diff/diff_ext_test.go b/diff/diff_ext_test.go
index 5ab8c7d..460cf8a 100644
--- a/diff/diff_ext_test.go
+++ b/diff/diff_ext_test.go
@@ -3,9 +3,10 @@ package diff_test
 import (
 	"testing"
 
-	. "gopkg.in/check.v1"
-
 	"gopkg.in/src-d/go-git.v2/diff"
+
+	"github.com/sergi/go-diff/diffmatchpatch"
+	. "gopkg.in/check.v1"
 )
 
 func Test(t *testing.T) { TestingT(t) }
@@ -39,7 +40,7 @@ var diffTests = [...]struct {
 	{"a\nbbbbb\n\tccc\ndd\n\tfffffffff\n", "bbbbb\n\tccc\n\tDD\n\tffff\n"},
 }
 
-func (s *suiteCommon) TestCountLines(c *C) {
+func (s *suiteCommon) TestAll(c *C) {
 	for i, t := range diffTests {
 		diffs := diff.Do(t.src, t.dst)
 		src := diff.Src(diffs)
@@ -48,3 +49,61 @@ func (s *suiteCommon) TestCountLines(c *C) {
 		c.Assert(dst, Equals, t.dst, Commentf("subtest %d, src=%q, dst=%q, bad calculated dst", i, t.src, t.dst))
 	}
 }
+
+var doTests = [...]struct {
+	src, dst string
+	expected []diffmatchpatch.Diff
+}{
+	{
+		src:      "",
+		dst:      "",
+		expected: []diffmatchpatch.Diff{},
+	},
+	{
+		src: "a",
+		dst: "a",
+		expected: []diffmatchpatch.Diff{
+			{
+				Type: 0,
+				Text: "a",
+			},
+		},
+	},
+	{
+		src: "",
+		dst: "abc\ncba",
+		expected: []diffmatchpatch.Diff{
+			{
+				Type: 1,
+				Text: "abc\ncba",
+			},
+		},
+	},
+	{
+		src: "abc\ncba",
+		dst: "",
+		expected: []diffmatchpatch.Diff{
+			{
+				Type: -1,
+				Text: "abc\ncba",
+			},
+		},
+	},
+	{
+		src: "abc\nbcd\ncde",
+		dst: "000\nabc\n111\nBCD\n",
+		expected: []diffmatchpatch.Diff{
+			{Type: 1, Text: "000\n"},
+			{Type: 0, Text: "abc\n"},
+			{Type: -1, Text: "bcd\ncde"},
+			{Type: 1, Text: "111\nBCD\n"},
+		},
+	},
+}
+
+func (s *suiteCommon) TestDo(c *C) {
+	for i, t := range doTests {
+		diffs := diff.Do(t.src, t.dst)
+		c.Assert(diffs, DeepEquals, t.expected, Commentf("subtest %d", i))
+	}
+}