Improved testing of index against trees, tests succeed with next commit

Author: Byron

TODO

@@ -14,7 +14,10 @@ General
   deleted.
 * References should be parsed 'manually' to get around command invocation, but 
   be sure to be able to read packed refs.
-
+* Effectively Objects only store hexsha's in their id attributes, so in fact 
+  it should be renamed to 'sha'. There was a time when references where allowed as 
+  well, but now objects will be 'baked' to the actual sha to assure comparisons work.
+  
 Config
 ------
 * Expand .get* methods of GitConfigParser to support default value. If it is not None, 

lib/git/index.py

@@ -288,7 +288,7 @@ def from_tree(cls, repo, *treeish, **kwargs):
 			If 1 Tree is given, it will just be read into a new index
 			If 2 Trees are given, they will be merged into a new index using a 
 			 two way merge algorithm. Tree 1 is the 'current' tree, tree 2 is the 'other'
-			 one.
+			 one. It behaves like a fast-forward.
 			If 3 Trees are given, a 3-way merge will be performed with the first tree
 			 being the common ancestor of tree 2 and tree 3. Tree 2 is the 'current' tree, 
 			 tree 3 is the 'other' one

test/git/test_index.py

@@ -41,6 +41,18 @@ def test_base(self):
 		index_output.seek(0)
 		assert index_output.read() == fixture("index_merge")
 
+	def _cmp_tree_index(self, tree, index):
+		# fail unless both objects contain the same paths and blobs
+		if isinstance(tree, str):
+			tree = self.repo.commit(tree).tree
+		
+		num_blobs = 0
+		for blob in tree.traverse(predicate = lambda e: e.type == "blob"):
+			assert (blob.path,0) in index.entries
+			num_blobs += 1
+		# END for each blob in tree
+		assert num_blobs == len(index.entries)
+	
 	def test_merge(self):
 		common_ancestor_sha = "5117c9c8a4d3af19a9958677e45cda9269de1541"
 		cur_sha = "4b43ca7ff72d5f535134241e7c797ddc9c7a3573"
@@ -49,12 +61,12 @@ def test_merge(self):
 		# simple index from tree 
 		base_index = Index.from_tree(self.repo, common_ancestor_sha)
 		assert base_index.entries
+		self._cmp_tree_index(common_ancestor_sha, base_index)
 
-		# merge two trees
+		# merge two trees - its like a fast-forward
 		two_way_index = Index.from_tree(self.repo, common_ancestor_sha, cur_sha)
 		assert two_way_index.entries
-		for e in two_way_index.entries.values():
-			print "%i | %s" % ( e.stage, e.path )
+		self._cmp_tree_index(cur_sha, two_way_index)
 
 		# merge three trees - here we have a merge conflict
 		tree_way_index = Index.from_tree(self.repo, common_ancestor_sha, cur_sha, other_sha)