1 files changed, 413 insertions, 0 deletions
diff --git a/plumbing/difftree/change_adaptor_test.go b/plumbing/difftree/change_adaptor_test.go
new file mode 100644
index 0000000..2ce2c54
--- /dev/null
+++ b/plumbing/difftree/change_adaptor_test.go
@@ -0,0 +1,413 @@
+package difftree
+
+import (
+	"os"
+	"sort"
+
+	"srcd.works/go-git.v4/plumbing"
+	"srcd.works/go-git.v4/plumbing/object"
+	"srcd.works/go-git.v4/plumbing/storer"
+	"srcd.works/go-git.v4/storage/filesystem"
+	"srcd.works/go-git.v4/utils/merkletrie"
+	"srcd.works/go-git.v4/utils/merkletrie/noder"
+
+	"github.com/src-d/go-git-fixtures"
+	. "gopkg.in/check.v1"
+)
+
+type ChangeAdaptorSuite struct {
+	fixtures.Suite
+	Storer  storer.EncodedObjectStorer
+	Fixture *fixtures.Fixture
+}
+
+func (s *ChangeAdaptorSuite) SetUpSuite(c *C) {
+	s.Suite.SetUpSuite(c)
+	s.Fixture = fixtures.Basic().One()
+	sto, err := filesystem.NewStorage(s.Fixture.DotGit())
+	c.Assert(err, IsNil)
+	s.Storer = sto
+}
+
+func (s *ChangeAdaptorSuite) tree(c *C, h plumbing.Hash) *object.Tree {
+	t, err := object.GetTree(s.Storer, h)
+	c.Assert(err, IsNil)
+	return t
+}
+
+var _ = Suite(&ChangeAdaptorSuite{})
+
+// utility function to build Noders from a tree and an tree entry.
+func newNoder(t *object.Tree, e object.TreeEntry) noder.Noder {
+	return &treeNoder{
+		parent: t,
+		name:   e.Name,
+		mode:   e.Mode,
+		hash:   e.Hash,
+	}
+}
+
+// utility function to build Paths
+func newPath(nn ...noder.Noder) noder.Path { return noder.Path(nn) }
+
+func (s *ChangeAdaptorSuite) TestTreeNoderHashHasMode(c *C) {
+	hash := plumbing.NewHash("aaaa")
+	mode := object.FileMode
+
+	treeNoder := &treeNoder{
+		hash: hash,
+		mode: mode,
+	}
+
+	expected := []byte{
+		0xaa, 0xaa, 0x00, 0x00, // original hash is aaaa and 16 zeros
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x00,
+		0xa4, 0x81, 0x00, 0x00, // object.FileMode in little endian
+	}
+
+	c.Assert(treeNoder.Hash(), DeepEquals, expected)
+}
+
+func (s *ChangeAdaptorSuite) TestNewChangeInsert(c *C) {
+	tree := &object.Tree{}
+	entry := object.TreeEntry{
+		Name: "name",
+		Mode: os.FileMode(42),
+		Hash: plumbing.NewHash("aaaaa"),
+	}
+	path := newPath(newNoder(tree, entry))
+
+	expectedTo, err := newChangeEntry(path)
+	c.Assert(err, IsNil)
+
+	src := merkletrie.Change{
+		From: nil,
+		To:   path,
+	}
+
+	obtained, err := newChange(src)
+	c.Assert(err, IsNil)
+	action, err := obtained.Action()
+	c.Assert(err, IsNil)
+	c.Assert(action, Equals, merkletrie.Insert)
+	c.Assert(obtained.From, Equals, ChangeEntry{})
+	c.Assert(obtained.To, Equals, expectedTo)
+}
+
+func (s *ChangeAdaptorSuite) TestNewChangeDelete(c *C) {
+	tree := &object.Tree{}
+	entry := object.TreeEntry{
+		Name: "name",
+		Mode: os.FileMode(42),
+		Hash: plumbing.NewHash("aaaaa"),
+	}
+	path := newPath(newNoder(tree, entry))
+
+	expectedFrom, err := newChangeEntry(path)
+	c.Assert(err, IsNil)
+
+	src := merkletrie.Change{
+		From: path,
+		To:   nil,
+	}
+
+	obtained, err := newChange(src)
+	c.Assert(err, IsNil)
+	action, err := obtained.Action()
+	c.Assert(err, IsNil)
+	c.Assert(action, Equals, merkletrie.Delete)
+	c.Assert(obtained.From, Equals, expectedFrom)
+	c.Assert(obtained.To, Equals, ChangeEntry{})
+}
+
+func (s *ChangeAdaptorSuite) TestNewChangeModify(c *C) {
+	treeA := &object.Tree{}
+	entryA := object.TreeEntry{
+		Name: "name",
+		Mode: os.FileMode(42),
+		Hash: plumbing.NewHash("aaaaa"),
+	}
+	pathA := newPath(newNoder(treeA, entryA))
+	expectedFrom, err := newChangeEntry(pathA)
+	c.Assert(err, IsNil)
+
+	treeB := &object.Tree{}
+	entryB := object.TreeEntry{
+		Name: "name",
+		Mode: os.FileMode(42),
+		Hash: plumbing.NewHash("bbbb"),
+	}
+	pathB := newPath(newNoder(treeB, entryB))
+	expectedTo, err := newChangeEntry(pathB)
+	c.Assert(err, IsNil)
+
+	src := merkletrie.Change{
+		From: pathA,
+		To:   pathB,
+	}
+
+	obtained, err := newChange(src)
+	c.Assert(err, IsNil)
+	action, err := obtained.Action()
+	c.Assert(err, IsNil)
+	c.Assert(action, Equals, merkletrie.Modify)
+	c.Assert(obtained.From, Equals, expectedFrom)
+	c.Assert(obtained.To, Equals, expectedTo)
+}
+
+func (s *ChangeAdaptorSuite) TestEmptyChangeFails(c *C) {
+	change := &Change{
+		From: empty,
+		To:   empty,
+	}
+	_, err := change.Action()
+	c.Assert(err, ErrorMatches, "malformed change.*")
+
+	_, _, err = change.Files()
+	c.Assert(err, ErrorMatches, "malformed change.*")
+
+	str := change.String()
+	c.Assert(str, Equals, "malformed change")
+}
+
+type noderMock struct{ noder.Noder }
+
+func (s *ChangeAdaptorSuite) TestNewChangeFailsWithChangesFromOtherNoders(c *C) {
+	src := merkletrie.Change{
+		From: newPath(noderMock{}),
+		To:   nil,
+	}
+	_, err := newChange(src)
+	c.Assert(err, Not(IsNil))
+
+	src = merkletrie.Change{
+		From: nil,
+		To:   newPath(noderMock{}),
+	}
+	_, err = newChange(src)
+	c.Assert(err, Not(IsNil))
+}
+
+func (s *ChangeAdaptorSuite) TestChangeStringFrom(c *C) {
+	expected := "<Action: Delete, Path: foo>"
+	change := Change{}
+	change.From.Name = "foo"
+
+	obtained := change.String()
+	c.Assert(obtained, Equals, expected)
+}
+
+func (s *ChangeAdaptorSuite) TestChangeStringTo(c *C) {
+	expected := "<Action: Insert, Path: foo>"
+	change := Change{}
+	change.To.Name = "foo"
+
+	obtained := change.String()
+	c.Assert(obtained, Equals, expected)
+}
+
+func (s *ChangeAdaptorSuite) TestChangeFilesInsert(c *C) {
+	tree := s.tree(c, plumbing.NewHash("a8d315b2b1c615d43042c3a62402b8a54288cf5c"))
+
+	change := Change{}
+	change.To.Name = "json/long.json"
+	change.To.Tree = tree
+	change.To.TreeEntry.Hash = plumbing.NewHash("49c6bb89b17060d7b4deacb7b338fcc6ea2352a9")
+
+	from, to, err := change.Files()
+	c.Assert(err, IsNil)
+	c.Assert(from, IsNil)
+	c.Assert(to.ID(), Equals, change.To.TreeEntry.Hash)
+}
+
+func (s *ChangeAdaptorSuite) TestChangeFilesInsertNotFound(c *C) {
+	tree := s.tree(c, plumbing.NewHash("a8d315b2b1c615d43042c3a62402b8a54288cf5c"))
+
+	change := Change{}
+	change.To.Name = "json/long.json"
+	change.To.Tree = tree
+	// there is no object for this hash
+	change.To.TreeEntry.Hash = plumbing.NewHash("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
+
+	_, _, err := change.Files()
+	c.Assert(err, Not(IsNil))
+}
+
+func (s *ChangeAdaptorSuite) TestChangeFilesDelete(c *C) {
+	tree := s.tree(c, plumbing.NewHash("a8d315b2b1c615d43042c3a62402b8a54288cf5c"))
+
+	change := Change{}
+	change.From.Name = "json/long.json"
+	change.From.Tree = tree
+	change.From.TreeEntry.Hash = plumbing.NewHash("49c6bb89b17060d7b4deacb7b338fcc6ea2352a9")
+
+	from, to, err := change.Files()
+	c.Assert(err, IsNil)
+	c.Assert(to, IsNil)
+	c.Assert(from.ID(), Equals, change.From.TreeEntry.Hash)
+}
+
+func (s *ChangeAdaptorSuite) TestChangeFilesDeleteNotFound(c *C) {
+	tree := s.tree(c, plumbing.NewHash("a8d315b2b1c615d43042c3a62402b8a54288cf5c"))
+
+	change := Change{}
+	change.From.Name = "json/long.json"
+	change.From.Tree = tree
+	// there is no object for this hash
+	change.From.TreeEntry.Hash = plumbing.NewHash("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
+
+	_, _, err := change.Files()
+	c.Assert(err, Not(IsNil))
+}
+
+func (s *ChangeAdaptorSuite) TestChangeFilesModify(c *C) {
+	tree := s.tree(c, plumbing.NewHash("a8d315b2b1c615d43042c3a62402b8a54288cf5c"))
+
+	change := Change{}
+	change.To.Name = "json/long.json"
+	change.To.Tree = tree
+	change.To.TreeEntry.Hash = plumbing.NewHash("49c6bb89b17060d7b4deacb7b338fcc6ea2352a9")
+	change.From.Name = "json/long.json"
+	change.From.Tree = tree
+	change.From.TreeEntry.Hash = plumbing.NewHash("9a48f23120e880dfbe41f7c9b7b708e9ee62a492")
+
+	from, to, err := change.Files()
+	c.Assert(err, IsNil)
+	c.Assert(to.ID(), Equals, change.To.TreeEntry.Hash)
+	c.Assert(from.ID(), Equals, change.From.TreeEntry.Hash)
+}
+
+func (s *ChangeAdaptorSuite) TestChangeEntryFailsWithOtherNoders(c *C) {
+	path := noder.Path{noderMock{}}
+	_, err := newChangeEntry(path)
+	c.Assert(err, Not(IsNil))
+}
+
+func (s *ChangeAdaptorSuite) TestChangeEntryFromNilIsZero(c *C) {
+	obtained, err := newChangeEntry(nil)
+	c.Assert(err, IsNil)
+	c.Assert(obtained, Equals, ChangeEntry{})
+}
+
+func (s *ChangeAdaptorSuite) TestChangeEntryFromSortPath(c *C) {
+	tree := &object.Tree{}
+	entry := object.TreeEntry{
+		Name: "name",
+		Mode: os.FileMode(42),
+		Hash: plumbing.NewHash("aaaaa"),
+	}
+	path := newPath(newNoder(tree, entry))
+
+	obtained, err := newChangeEntry(path)
+	c.Assert(err, IsNil)
+
+	c.Assert(obtained.Name, Equals, entry.Name)
+	c.Assert(obtained.Tree, Equals, tree)
+	c.Assert(obtained.TreeEntry, DeepEquals, entry)
+}
+
+func (s *ChangeAdaptorSuite) TestChangeEntryFromLongPath(c *C) {
+	treeA := &object.Tree{}
+	entryA := object.TreeEntry{
+		Name: "nameA",
+		Mode: os.FileMode(42),
+		Hash: plumbing.NewHash("aaaa"),
+	}
+
+	treeB := &object.Tree{}
+	entryB := object.TreeEntry{
+		Name: "nameB",
+		Mode: os.FileMode(24),
+		Hash: plumbing.NewHash("bbbb"),
+	}
+
+	path := newPath(
+		newNoder(treeA, entryA),
+		newNoder(treeB, entryB),
+	)
+
+	obtained, err := newChangeEntry(path)
+	c.Assert(err, IsNil)
+
+	c.Assert(obtained.Name, Equals, entryA.Name+"/"+entryB.Name)
+	c.Assert(obtained.Tree, Equals, treeB)
+	c.Assert(obtained.TreeEntry, Equals, entryB)
+}
+
+func (s *ChangeAdaptorSuite) TestNewChangesEmpty(c *C) {
+	expected := "[]"
+	changes, err := newChanges(nil)
+	c.Assert(err, IsNil)
+	obtained := changes.String()
+	c.Assert(obtained, Equals, expected)
+
+	expected = "[]"
+	changes, err = newChanges(merkletrie.Changes{})
+	c.Assert(err, IsNil)
+	obtained = changes.String()
+	c.Assert(obtained, Equals, expected)
+}
+
+func (s *ChangeAdaptorSuite) TestNewChanges(c *C) {
+	treeA := &object.Tree{}
+	entryA := object.TreeEntry{Name: "nameA"}
+	pathA := newPath(newNoder(treeA, entryA))
+	changeA := merkletrie.Change{
+		From: nil,
+		To:   pathA,
+	}
+
+	treeB := &object.Tree{}
+	entryB := object.TreeEntry{Name: "nameB"}
+	pathB := newPath(newNoder(treeB, entryB))
+	changeB := merkletrie.Change{
+		From: pathB,
+		To:   nil,
+	}
+	src := merkletrie.Changes{changeA, changeB}
+
+	changes, err := newChanges(src)
+	c.Assert(err, IsNil)
+	c.Assert(len(changes), Equals, 2)
+	action, err := changes[0].Action()
+	c.Assert(err, IsNil)
+	c.Assert(action, Equals, merkletrie.Insert)
+	c.Assert(changes[0].To.Name, Equals, "nameA")
+	action, err = changes[1].Action()
+	c.Assert(err, IsNil)
+	c.Assert(action, Equals, merkletrie.Delete)
+	c.Assert(changes[1].From.Name, Equals, "nameB")
+}
+
+func (s *ChangeAdaptorSuite) TestNewChangesFailsWithOtherNoders(c *C) {
+	change := merkletrie.Change{
+		From: nil,
+		To:   newPath(noderMock{}),
+	}
+	src := merkletrie.Changes{change}
+
+	_, err := newChanges(src)
+	c.Assert(err, Not(IsNil))
+}
+
+func (s *ChangeAdaptorSuite) TestSortChanges(c *C) {
+	c1 := &Change{}
+	c1.To.Name = "1"
+
+	c2 := &Change{}
+	c2.From.Name = "2"
+	c2.To.Name = "2"
+
+	c3 := &Change{}
+	c3.From.Name = "3"
+
+	changes := Changes{c3, c1, c2}
+	sort.Sort(changes)
+
+	c.Assert(changes[0].String(), Equals, "<Action: Insert, Path: 1>")
+	c.Assert(changes[1].String(), Equals, "<Action: Modify, Path: 2>")
+	c.Assert(changes[2].String(), Equals, "<Action: Delete, Path: 3>")
+}