1 files changed, 108 insertions, 0 deletions
diff --git a/utils/merkletrie/index/node_test.go b/utils/merkletrie/index/node_test.go
new file mode 100644
index 0000000..48aa35f
--- /dev/null
+++ b/utils/merkletrie/index/node_test.go
@@ -0,0 +1,108 @@
+package index
+
+import (
+	"bytes"
+	"testing"
+
+	. "gopkg.in/check.v1"
+	"gopkg.in/src-d/go-git.v4/plumbing"
+	"gopkg.in/src-d/go-git.v4/plumbing/format/index"
+	"gopkg.in/src-d/go-git.v4/utils/merkletrie"
+	"gopkg.in/src-d/go-git.v4/utils/merkletrie/noder"
+)
+
+func Test(t *testing.T) { TestingT(t) }
+
+type NoderSuite struct{}
+
+var _ = Suite(&NoderSuite{})
+
+func (s *NoderSuite) TestDiff(c *C) {
+	indexA := &index.Index{
+		Entries: []index.Entry{
+			{Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+			{Name: "bar/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+			{Name: "bar/qux", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+			{Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+		},
+	}
+
+	indexB := &index.Index{
+		Entries: []index.Entry{
+			{Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+			{Name: "bar/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+			{Name: "bar/qux", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+			{Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+		},
+	}
+
+	ch, err := merkletrie.DiffTree(NewRootNode(indexA), NewRootNode(indexB), isEquals)
+	c.Assert(err, IsNil)
+	c.Assert(ch, HasLen, 0)
+}
+
+func (s *NoderSuite) TestDiffChange(c *C) {
+	indexA := &index.Index{
+		Entries: []index.Entry{
+			{Name: "bar/baz/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+		},
+	}
+
+	indexB := &index.Index{
+		Entries: []index.Entry{
+			{Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+		},
+	}
+
+	ch, err := merkletrie.DiffTree(NewRootNode(indexA), NewRootNode(indexB), isEquals)
+	c.Assert(err, IsNil)
+	c.Assert(ch, HasLen, 2)
+}
+
+func (s *NoderSuite) TestDiffDir(c *C) {
+	indexA := &index.Index{
+		Entries: []index.Entry{
+			{Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+		},
+	}
+
+	indexB := &index.Index{
+		Entries: []index.Entry{
+			{Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+		},
+	}
+
+	ch, err := merkletrie.DiffTree(NewRootNode(indexA), NewRootNode(indexB), isEquals)
+	c.Assert(err, IsNil)
+	c.Assert(ch, HasLen, 2)
+}
+
+func (s *NoderSuite) TestDiffSameRoot(c *C) {
+	indexA := &index.Index{
+		Entries: []index.Entry{
+			{Name: "foo.go", Hash: plumbing.NewHash("aab686eafeb1f44702738c8b0f24f2567c36da6d")},
+			{Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+		},
+	}
+
+	indexB := &index.Index{
+		Entries: []index.Entry{
+			{Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+			{Name: "foo.go", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+		},
+	}
+
+	ch, err := merkletrie.DiffTree(NewRootNode(indexA), NewRootNode(indexB), isEquals)
+	c.Assert(err, IsNil)
+	c.Assert(ch, HasLen, 1)
+}
+
+var empty = make([]byte, 24)
+
+func isEquals(a, b noder.Hasher) bool {
+	if bytes.Equal(a.Hash(), empty) || bytes.Equal(b.Hash(), empty) {
+		return false
+	}
+
+	return bytes.Equal(a.Hash(), b.Hash())
+}