1 files changed, 53 insertions, 0 deletions
diff --git a/formats/objfile/writer_test.go b/formats/objfile/writer_test.go
new file mode 100644
index 0000000..03b8370
--- /dev/null
+++ b/formats/objfile/writer_test.go
@@ -0,0 +1,53 @@
+package objfile
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"io"
+
+	. "gopkg.in/check.v1"
+	"gopkg.in/src-d/go-git.v3/core"
+)
+
+type SuiteWriter struct{}
+
+var _ = Suite(&SuiteWriter{})
+
+func (s *SuiteWriter) TestWriteObjfile(c *C) {
+	for k, fixture := range objfileFixtures {
+		comment := fmt.Sprintf("test %d: ", k)
+		hash := core.NewHash(fixture.hash)
+		content, _ := base64.StdEncoding.DecodeString(fixture.content)
+		buffer := new(bytes.Buffer)
+
+		// Write the data out to the buffer
+		testWriter(c, buffer, hash, fixture.t, content, comment)
+
+		// Read the data back in from the buffer to be sure it matches
+		testReader(c, buffer, hash, fixture.t, content, comment)
+	}
+}
+
+func testWriter(c *C, dest io.Writer, hash core.Hash, typ core.ObjectType, content []byte, comment string) {
+	length := int64(len(content))
+	w, err := NewWriter(dest, typ, length)
+	c.Assert(err, IsNil)
+	c.Assert(w.Type(), Equals, typ)
+	c.Assert(w.Size(), Equals, length)
+	written, err := io.Copy(w, bytes.NewReader(content))
+	c.Assert(err, IsNil)
+	c.Assert(written, Equals, length)
+	c.Assert(w.Hash(), Equals, hash) // Test Hash() before close
+	c.Assert(w.Close(), IsNil)
+	c.Assert(w.Hash(), Equals, hash) // Test Hash() after close
+}
+
+func (s *SuiteWriter) TestWriteOverflow(c *C) {
+	w, err := NewWriter(new(bytes.Buffer), core.BlobObject, 8)
+	c.Assert(err, IsNil)
+	_, err = w.Write([]byte("1234"))
+	c.Assert(err, IsNil)
+	_, err = w.Write([]byte("56789"))
+	c.Assert(err, Equals, ErrOverflow)
+}