1 files changed, 45 insertions, 0 deletions
diff --git a/plumbing/format/idxfile/writer_test.go b/plumbing/format/idxfile/writer_test.go
new file mode 100644
index 0000000..92d2046
--- /dev/null
+++ b/plumbing/format/idxfile/writer_test.go
@@ -0,0 +1,45 @@
+package idxfile_test
+
+import (
+	"bytes"
+	"io/ioutil"
+
+	"gopkg.in/src-d/go-git.v4/plumbing/format/idxfile"
+	"gopkg.in/src-d/go-git.v4/plumbing/format/packfile"
+
+	. "gopkg.in/check.v1"
+	"gopkg.in/src-d/go-git-fixtures.v3"
+)
+
+type IndexSuite struct {
+	fixtures.Suite
+}
+
+var _ = Suite(&IndexSuite{})
+
+func (s *IndexSuite) TestIndexWriter(c *C) {
+	f := fixtures.Basic().One()
+	scanner := packfile.NewScanner(f.Packfile())
+
+	obs := new(idxfile.Writer)
+	parser := packfile.NewParser(scanner, obs)
+
+	_, err := parser.Parse()
+	c.Assert(err, IsNil)
+
+	idx, err := obs.CreateIndex()
+	c.Assert(err, IsNil)
+
+	idxFile := f.Idx()
+	expected, err := ioutil.ReadAll(idxFile)
+	c.Assert(err, IsNil)
+	idxFile.Close()
+
+	buf := new(bytes.Buffer)
+	encoder := idxfile.NewEncoder(buf)
+	n, err := encoder.Encode(idx)
+	c.Assert(err, IsNil)
+	c.Assert(n, Equals, len(expected))
+
+	c.Assert(buf.Bytes(), DeepEquals, expected)
+}