code: def test_repo_diff(path=None, norepo=None):
      ds = Dataset(path).create()
      assert_repo_status(ds.path)
      assert_raises(ValueError, ds.repo.diff, fr="WTF", to="MIKE")
  
      if ds.repo.is_managed_branch():
          fr_base = DEFAULT_BRANCH
          to = DEFAULT_BRANCH
      else:
          fr_base = "HEAD"
          to = None
  
      # no diff
      eq_(ds.repo.diff(fr_base, to), {})
      # bogus path makes no difference
      eq_(ds.repo.diff(fr_base, to, paths=["THIS"]), {})
      # let's introduce a known change
      create_tree(ds.path, {"new": "empty"})
      ds.save(to_git=True)
      assert_repo_status(ds.path)
      eq_(
          ds.repo.diff(fr=fr_base + "~1", to=fr_base),
          {
              ut.Path(ds.repo.pathobj / "new"): {
                  "state": "added",
                  "type": "file",
                  "bytesize": 5,
                  "gitshasum": "7b4d68d70fcae134d5348f5e118f5e9c9d3f05f6",
              }
          },
      )
      # modify known file
      create_tree(ds.path, {"new": "notempty"})
      eq_(
          ds.repo.diff(fr="HEAD", to=None),
          {
              ut.Path(ds.repo.pathobj / "new"): {
                  "state": "modified",
                  "type": "file",
                  # the beast is modified, but no change in shasum -> not staged
                  "gitshasum": "7b4d68d70fcae134d5348f5e118f5e9c9d3f05f6",
                  "prev_gitshasum": "7b4d68d70fcae134d5348f5e118f5e9c9d3f05f6",
              }
          },
      )
      # per path query gives the same result
      eq_(
          ds.repo.diff(fr=fr_base, to=to),
          ds.repo.diff(fr=fr_base, to=to, paths=["new"]),
      )
      # also given a directory as a constraint does the same
      eq_(
          ds.repo.diff(fr=fr_base, to=to),
          ds.repo.diff(fr=fr_base, to=to, paths=["."]),
      )
      # but if we give another path, it doesn't show up
      eq_(ds.repo.diff(fr=fr_base, to=to, paths=["other"]), {})
  
      # make clean
      ds.save()
      assert_repo_status(ds.path)
  
      # untracked stuff
      create_tree(
          ds.path, {"deep": {"down": "untracked", "down2": "tobeadded"}}
      )
      # default is to report all files
      eq_(
          ds.repo.diff(fr="HEAD", to=None),
          {
              ut.Path(ds.repo.pathobj / "deep" / "down"): {
                  "state": "untracked",
                  "type": "file",
              },
              ut.Path(ds.repo.pathobj / "deep" / "down2"): {
                  "state": "untracked",
                  "type": "file",
              },
          },
      )
      # but can be made more compact
      eq_(
          ds.repo.diff(fr="HEAD", to=None, untracked="normal"),
          {
              ut.Path(ds.repo.pathobj / "deep"): {
                  "state": "untracked",
                  "type": "directory",
              }
          },
      )
  
      # again a unmatching path constrained will give an empty report
      eq_(ds.repo.diff(fr="HEAD", to=None, paths=["other"]), {})
      # perfect match and anything underneath will do
      eq_(
          ds.repo.diff(fr="HEAD", to=None, paths=["deep"]),
          {
              ut.Path(ds.repo.pathobj / "deep" / "down"): {
                  "state": "untracked",
                  "type": "file",
              },
              ut.Path(ds.repo.pathobj / "deep" / "down2"): {
                  "state": "untracked",
                  "type": "file",
              },
          },
      )
  
imports: import os
  import os.path
  from unittest.mock import patch
  import datalad.utils
  from datalad.api import create, diff, save
  from datalad.cmd import GitWitlessRunner, StdOutCapture
  from datalad.consts import PRE_INIT_COMMIT_SHA
  from datalad.distribution.dataset import Dataset
  from datalad.support.exceptions import NoDatasetFound
  from datalad.tests.utils_pytest import DEFAULT_BRANCH, OBSCURE_FILENAME, SkipTest, assert_in, assert_raises, assert_repo_status, assert_result_count, assert_status, chpwd, create_tree, eq_, get_deeply_nested_structure, has_symlink_capability, known_failure_githubci_win, neq_, ok_, with_tempfile
  from datalad.utils import Path
label_desc: Use image node_id 2 for calling a global function with example usage: test_repo_diff(path, norepo) without return types