tests: add some DvcTree unit tests

dvc/repo/tree.py

@@ -1,3 +1,4 @@
+import os
 import errno
 
 from dvc.scm.tree import BaseTree
@@ -27,12 +28,12 @@ def open(self, path, mode="r", encoding="utf-8"):
         except OutputNotFoundError as exc:
             raise FileNotFoundError from exc
 
-        if len(outs) != 1 or outs[0].isdir():
+        if len(outs) != 1 or outs[0].is_dir_checksum:
             raise IOError(errno.EISDIR)
 
         out = outs[0]
         if not out.changed_cache():
-            return open(out.cache_path.fspath, mode=mode, encoding=encoding)
+            return open(out.cache_path, mode=mode, encoding=encoding)
 
         raise FileNotFoundError
 
@@ -47,12 +48,12 @@ def isdir(self, path):
         if not self.exists(path):
             return False
 
+        path_info = PathInfo(os.path.abspath(path))
         outs = self._find_outs(path, strict=False, recursive=True)
-
-        if len(outs) != 1 or outs[0].path_info.fspath != path:
+        if len(outs) != 1 or outs[0].path_info != path_info:
             return True
 
-        return outs[0].isdir()
+        return outs[0].is_dir_checksum
 
     def isfile(self, path):
         if not self.exists(path):
@@ -70,7 +71,7 @@ def _walk(self, root, trie, topdown=True):
                 continue
 
             name = key[root_len]
-            if len(key) > root_len + 1 or out.isdir():
+            if len(key) > root_len + 1 or out.is_dir_checksum:
                 dirs.add(name)
                 continue
 
@@ -95,7 +96,7 @@ def walk(self, top, topdown=True):
         if not self.isdir(top):
             raise NotADirectoryError
 
-        root = PathInfo(top)
+        root = PathInfo(os.path.abspath(top))
         outs = self._find_outs(top, recursive=True, strict=False)
 
         trie = Trie()

tests/unit/repo/test_tree.py

@@ -0,0 +1,95 @@
+import os
+import shutil
+
+from dvc.repo.tree import DvcTree
+from dvc.compat import fspath_py35
+
+
+def test_exists(tmp_dir, dvc):
+    tmp_dir.gen("foo", "foo")
+    dvc.add("foo")
+    (tmp_dir / "foo").unlink()
+
+    tree = DvcTree(dvc)
+    assert tree.exists("foo")
+
+
+def test_open(tmp_dir, dvc):
+    tmp_dir.gen("foo", "foo")
+    dvc.add("foo")
+    (tmp_dir / "foo").unlink()
+
+    tree = DvcTree(dvc)
+    with tree.open("foo", "r") as fobj:
+        assert fobj.read() == "foo"
+
+
+def test_isdir_isfile(tmp_dir, dvc):
+    tmp_dir.gen({"datafile": "data", "datadir": {"foo": "foo", "bar": "bar"}})
+
+    tree = DvcTree(dvc)
+    assert not tree.isdir("datadir")
+    assert not tree.isfile("datadir")
+    assert not tree.isdir("datafile")
+    assert not tree.isfile("datafile")
+
+    dvc.add(["datadir", "datafile"])
+    shutil.rmtree(fspath_py35(tmp_dir / "datadir"))
+    (tmp_dir / "datafile").unlink()
+
+    assert tree.isdir("datadir")
+    assert not tree.isfile("datadir")
+    assert not tree.isdir("datafile")
+    assert tree.isfile("datafile")
+
+
+def test_isdir_mixed(tmp_dir, dvc):
+    tmp_dir.gen({"dir": {"foo": "foo", "bar": "bar"}})
+
+    dvc.add(str(tmp_dir / "dir" / "foo"))
+
+    tree = DvcTree(dvc)
+    assert tree.isdir("dir")
+    assert not tree.isfile("dir")
+
+
+def test_walk(tmp_dir, dvc):
+    tmp_dir.gen(
+        {
+            "dir": {
+                "subdir1": {"foo1": "foo1", "bar1": "bar1"},
+                "subdir2": {"foo2": "foo2"},
+                "foo": "foo",
+                "bar": "bar",
+            }
+        }
+    )
+
+    dvc.add("dir", recursive=True)
+    tree = DvcTree(dvc)
+
+    expected = [
+        str(tmp_dir / "dir" / "subdir1"),
+        str(tmp_dir / "dir" / "subdir2"),
+        str(tmp_dir / "dir" / "subdir1" / "foo1"),
+        str(tmp_dir / "dir" / "subdir1" / "bar1"),
+        str(tmp_dir / "dir" / "subdir2" / "foo2"),
+        str(tmp_dir / "dir" / "foo"),
+        str(tmp_dir / "dir" / "bar"),
+    ]
+
+    actual = []
+    for root, dirs, files in tree.walk("dir"):
+        for entry in dirs + files:
+            actual.append(os.path.join(root, entry))
+
+    assert set(actual) == set(expected)
+    assert len(actual) == len(expected)
+
+
+def test_isdvc(tmp_dir, dvc):
+    tmp_dir.gen({"foo": "foo", "bar": "bar"})
+    dvc.add("foo")
+    tree = DvcTree(dvc)
+    assert tree.isdvc("foo")
+    assert not tree.isdvc("bar")