1 files changed, 48 insertions, 0 deletions
diff --git a/plumbing/format/idxfile/encoder_test.go b/plumbing/format/idxfile/encoder_test.go
new file mode 100644
index 0000000..9a53863
--- /dev/null
+++ b/plumbing/format/idxfile/encoder_test.go
@@ -0,0 +1,48 @@
+package idxfile
+
+import (
+	"bytes"
+	"io/ioutil"
+
+	. "gopkg.in/check.v1"
+	"gopkg.in/src-d/go-git.v4/fixtures"
+	"gopkg.in/src-d/go-git.v4/plumbing"
+)
+
+func (s *IdxfileSuite) TestEncode(c *C) {
+	expected := &Idxfile{}
+	expected.Add(plumbing.NewHash("4bfc730165c370df4a012afbb45ba3f9c332c0d4"), 82, 82)
+	expected.Add(plumbing.NewHash("8fa2238efdae08d83c12ee176fae65ff7c99af46"), 42, 42)
+
+	buf := bytes.NewBuffer(nil)
+	e := NewEncoder(buf)
+	_, err := e.Encode(expected)
+	c.Assert(err, IsNil)
+
+	idx := &Idxfile{}
+	d := NewDecoder(buf)
+	err = d.Decode(idx)
+	c.Assert(err, IsNil)
+
+	c.Assert(idx.Entries, DeepEquals, expected.Entries)
+}
+
+func (s *IdxfileSuite) TestDecodeEncode(c *C) {
+	fixtures.ByTag("packfile").Test(c, func(f *fixtures.Fixture) {
+		expected, err := ioutil.ReadAll(f.Idx())
+		c.Assert(err, IsNil)
+
+		idx := &Idxfile{}
+		d := NewDecoder(bytes.NewBuffer(expected))
+		err = d.Decode(idx)
+		c.Assert(err, IsNil)
+
+		result := bytes.NewBuffer(nil)
+		e := NewEncoder(result)
+		size, err := e.Encode(idx)
+		c.Assert(err, IsNil)
+
+		c.Assert(size, Equals, len(expected))
+		c.Assert(result.Bytes(), DeepEquals, expected)
+	})
+}