test: Test dataset context and file parts

Author: effigies

src/bids_validator/context.py

@@ -253,7 +253,7 @@ def from_file(cls, file: FileTree, schema: Namespace) -> t.Self:
 
         datatype = None
         if file.parent:
-            if any(file.parent.name == dtype.value for dtype in schema.objects.datatypes):
+            if any(file.parent.name == dtype.value for dtype in schema.objects.datatypes.values()):
                 datatype = file.parent.name
 
         *entity_strings, suffix = stem.split('_')
@@ -263,7 +263,7 @@ def from_file(cls, file: FileTree, schema: Namespace) -> t.Self:
         }
 
         return cls(
-            path=file.relative_path,
+            path=f'/{file.relative_path}',
             stem=stem,
             entities=entities,
             datatype=datatype,

src/bids_validator/types/files.py

@@ -115,6 +115,13 @@ def __fspath__(self):
     def __hash__(self):
         return hash(self.direntry.path)
 
+    def __truediv__(self, relpath: str | os.PathLike) -> t.Self:
+        parts = Path(relpath).parts
+        child = self
+        for part in parts:
+            child = child.children[part]
+        return child
+
     @cached_property
     def relative_path(self) -> str:
         """The path of the current FileTree, relative to the root.

tests/conftest.py

@@ -5,6 +5,8 @@
 from pathlib import Path
 
 import pytest
+from bidsschematools.schema import load_schema
+from bidsschematools.types import Namespace
 
 
 @pytest.fixture(scope='session')
@@ -31,3 +33,9 @@ def gitignore_test() -> Path:
     else:  # pragma: no cover
         pass
     return Path(ret)
+
+
+@pytest.fixture(scope='session')
+def schema() -> Namespace:
+    """Load BIDS schema for tests."""
+    return load_schema()

tests/test_context.py

@@ -0,0 +1,26 @@
+from bids_validator import context
+from bids_validator.types.files import FileTree
+
+
+def test_load(examples):
+    tree = FileTree.read_from_filesystem(examples / 'synthetic')
+    ds = context.Dataset(tree)
+
+    assert ds.dataset_description.Name.startswith('Synthetic dataset')
+    assert ds.subjects.participant_id == [f'sub-{i:02d}' for i in range(1, 6)]
+    assert ds.subjects.sub_dirs == [f'sub-{i:02d}' for i in range(1, 6)]
+
+
+def test_fileparts(examples, schema):
+    tree = FileTree.read_from_filesystem(examples / 'synthetic')
+
+    T1w = tree / 'sub-01' / 'ses-01' / 'anat' / 'sub-01_ses-01_T1w.nii'
+    parts = context.FileParts.from_file(T1w, schema)
+    assert parts == context.FileParts(
+        path='/sub-01/ses-01/anat/sub-01_ses-01_T1w.nii',
+        stem='sub-01_ses-01_T1w',
+        entities={'sub': '01', 'ses': '01'},
+        datatype='anat',
+        suffix='T1w',
+        extension='.nii',
+    )