Add test for slice-to-slice and GCo pointer detection

.travis.yml

@@ -10,6 +10,7 @@ go:
   - 1.3
   - 1.4
   - 1.5
+  - 1.6
   - tip
 
 matrix:

blob_test.go

@@ -1,9 +1,21 @@
 package git
 
 import (
+	"bytes"
 	"testing"
 )
 
+type bufWrapper struct {
+	buf     [64]byte
+	pointer []byte
+}
+
+func doublePointerBytes() []byte {
+	o := &bufWrapper{}
+	o.pointer = o.buf[0:10]
+	return o.pointer[0:1]
+}
+
 func TestCreateBlobFromBuffer(t *testing.T) {
 	repo := createTestRepo(t)
 	defer cleanupTestRepo(t, repo)
@@ -14,4 +26,18 @@ func TestCreateBlobFromBuffer(t *testing.T) {
 	if id.String() != "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391" {
 		t.Fatal("Empty buffer did not deliver empty blob id")
 	}
+
+	for _, data := range []([]byte){[]byte("hello there"), doublePointerBytes()} {
+		expected := make([]byte, len(data))
+		copy(expected, data)
+		id, err = repo.CreateBlobFromBuffer(data)
+		checkFatal(t, err)
+
+		blob, err := repo.LookupBlob(id)
+		checkFatal(t, err)
+		if !bytes.Equal(blob.Contents(), expected) {
+			t.Fatal("Loaded bytes don't match original bytes:",
+				blob.Contents(), "!=", expected)
+		}
+	}
 }