interface cases

docs/api/testing/index.md

@@ -2,6 +2,15 @@
 
 Utilities for testing and 3rd-party interface development.
 
+Only things that *don't* require pytest go in this module. 
+We want to keep all test-time specific behavior there,
+and have this just serve as helpers exposed for downstream interface development.
+
+We want to avoid pytest stuff bleeding in here because then we limit
+the ability for downstream developers to configure their own tests.
+
+*(If there is some reason to change this division of labor, just raise an issue and let's chat.)*
+
 ```{toctree}
 cases
 helpers

pyproject.toml

@@ -131,6 +131,9 @@ markers = [
     "zarr: zarr interface",
 ]
 
+[tool.black]
+target-version = ["py39", "py310", "py311", "py312"]
+
 [tool.ruff]
 target-version = "py39"
 include = ["src/numpydantic/**/*.py", "tests/**/*.py", "pyproject.toml"]

src/numpydantic/interface/__init__.py

@@ -3,7 +3,7 @@ Interfaces between nptyping types and array backends
 """
 
 from numpydantic.interface.dask import DaskInterface
-from numpydantic.interface.hdf5 import H5Interface
+from numpydantic.interface.hdf5 import H5ArrayPath, H5Interface
 from numpydantic.interface.interface import (
     Interface,
     InterfaceMark,
@@ -12,10 +12,11 @@ from numpydantic.interface.interface import (
 )
 from numpydantic.interface.numpy import NumpyInterface
 from numpydantic.interface.video import VideoInterface
-from numpydantic.interface.zarr import ZarrInterface
+from numpydantic.interface.zarr import ZarrArrayPath, ZarrInterface
 
 __all__ = [
     "DaskInterface",
+    "H5ArrayPath",
     "H5Interface",
     "Interface",
     "InterfaceMark",
@@ -23,5 +24,6 @@ __all__ = [
     "MarkedJson",
     "NumpyInterface",
     "VideoInterface",
+    "ZarrArrayPath",
     "ZarrInterface",
 ]

src/numpydantic/testing/__init__.py

@@ -0,0 +1,6 @@
+from numpydantic.testing.helpers import InterfaceCase, ValidationCase
+
+__all__ = [
+    "InterfaceCase",
+    "ValidationCase",
+]

src/numpydantic/testing/cases.py

@@ -1,12 +1,25 @@
 import sys
-from typing import Union
+from collections.abc import Sequence
+from itertools import product
+from typing import Generator, Union
 
 import numpy as np
 from pydantic import BaseModel
 
 from numpydantic import NDArray, Shape
 from numpydantic.dtype import Float, Integer, Number
-from numpydantic.testing.helpers import ValidationCase
+from numpydantic.testing.helpers import ValidationCase, merge_cases
+from numpydantic.testing.interfaces import (
+    DaskCase,
+    HDF5Case,
+    HDF5CompoundCase,
+    NumpyCase,
+    VideoCase,
+    ZarrCase,
+    ZarrDirCase,
+    ZarrNestedCase,
+    ZarrZipCase,
+)
 
 if sys.version_info.minor >= 10:
     from typing import TypeAlias
@@ -30,6 +43,10 @@ class SubClass(BasicModel):
     pass
 
 
+# --------------------------------------------------
+# Annotations
+# --------------------------------------------------
+
 RGB_UNION: TypeAlias = Union[
     NDArray[Shape["* x, * y"], Number],
     NDArray[Shape["* x, * y, 3 r_g_b"], Number],
@@ -42,89 +59,159 @@ STRING: TypeAlias = NDArray[Shape["*, *, *"], str]
 MODEL: TypeAlias = NDArray[Shape["*, *, *"], BasicModel]
 UNION_TYPE: TypeAlias = NDArray[Shape["*, *, *"], Union[np.uint32, np.float32]]
 UNION_PIPE: TypeAlias = NDArray[Shape["*, *, *"], np.uint32 | np.float32]
+
+SHAPE_CASES = (
+    ValidationCase(shape=(10, 10, 10), passes=True, id="valid shape"),
+    ValidationCase(shape=(10, 10), passes=False, id="missing dimension"),
+    ValidationCase(shape=(10, 10, 10, 10), passes=False, id="extra dimension"),
+    ValidationCase(shape=(11, 10, 10), passes=False, id="dimension too large"),
+    ValidationCase(shape=(9, 10, 10), passes=False, id="dimension too small"),
+    ValidationCase(shape=(10, 10, 9), passes=True, id="wildcard smaller"),
+    ValidationCase(shape=(10, 10, 11), passes=True, id="wildcard larger"),
+    ValidationCase(annotation=RGB_UNION, shape=(5, 5), passes=True, id="Union 2D"),
+    ValidationCase(annotation=RGB_UNION, shape=(5, 5, 3), passes=True, id="Union 3D"),
+    ValidationCase(
+        annotation=RGB_UNION, shape=(5, 5, 3, 4), passes=True, id="Union 4D"
+    ),
+    ValidationCase(
+        annotation=RGB_UNION, shape=(5, 5, 4), passes=False, id="Union incorrect 3D"
+    ),
+    ValidationCase(
+        annotation=RGB_UNION, shape=(5, 5, 3, 6), passes=False, id="Union incorrect 4D"
+    ),
+    ValidationCase(
+        annotation=RGB_UNION,
+        shape=(5, 5, 4, 6),
+        passes=False,
+        id="Union incorrect both",
+    ),
+)
+
+
 DTYPE_CASES = [
-    ValidationCase(dtype=float, passes=True),
+    ValidationCase(dtype=float, passes=True, id="float"),
-    ValidationCase(dtype=int, passes=False),
+    ValidationCase(dtype=int, passes=False, id="int"),
-    ValidationCase(dtype=np.uint8, passes=False),
+    ValidationCase(dtype=np.uint8, passes=False, id="uint8"),
-    ValidationCase(annotation=NUMBER, dtype=int, passes=True),
+    ValidationCase(annotation=NUMBER, dtype=int, passes=True, id="number-int"),
-    ValidationCase(annotation=NUMBER, dtype=float, passes=True),
+    ValidationCase(annotation=NUMBER, dtype=float, passes=True, id="number-float"),
-    ValidationCase(annotation=NUMBER, dtype=np.uint8, passes=True),
+    ValidationCase(annotation=NUMBER, dtype=np.uint8, passes=True, id="number-uint8"),
-    ValidationCase(annotation=NUMBER, dtype=np.float16, passes=True),
+    ValidationCase(
-    ValidationCase(annotation=NUMBER, dtype=str, passes=False),
+        annotation=NUMBER, dtype=np.float16, passes=True, id="number-float16"
-    ValidationCase(annotation=INTEGER, dtype=int, passes=True),
+    ),
-    ValidationCase(annotation=INTEGER, dtype=np.uint8, passes=True),
+    ValidationCase(annotation=NUMBER, dtype=str, passes=False, id="number-str"),
-    ValidationCase(annotation=INTEGER, dtype=float, passes=False),
+    ValidationCase(annotation=INTEGER, dtype=int, passes=True, id="integer-int"),
-    ValidationCase(annotation=INTEGER, dtype=np.float32, passes=False),
+    ValidationCase(annotation=INTEGER, dtype=np.uint8, passes=True, id="integer-uint8"),
-    ValidationCase(annotation=INTEGER, dtype=str, passes=False),
+    ValidationCase(annotation=INTEGER, dtype=float, passes=False, id="integer-float"),
-    ValidationCase(annotation=FLOAT, dtype=float, passes=True),
+    ValidationCase(
-    ValidationCase(annotation=FLOAT, dtype=np.float32, passes=True),
+        annotation=INTEGER, dtype=np.float32, passes=False, id="integer-float32"
-    ValidationCase(annotation=FLOAT, dtype=int, passes=False),
+    ),
-    ValidationCase(annotation=FLOAT, dtype=np.uint8, passes=False),
+    ValidationCase(annotation=INTEGER, dtype=str, passes=False, id="integer-str"),
-    ValidationCase(annotation=FLOAT, dtype=str, passes=False),
+    ValidationCase(annotation=FLOAT, dtype=float, passes=True, id="float-float"),
-    ValidationCase(annotation=STRING, dtype=str, passes=True),
+    ValidationCase(annotation=FLOAT, dtype=np.float32, passes=True, id="float-float32"),
-    ValidationCase(annotation=STRING, dtype=int, passes=False),
+    ValidationCase(annotation=FLOAT, dtype=int, passes=False, id="float-int"),
-    ValidationCase(annotation=STRING, dtype=float, passes=False),
+    ValidationCase(annotation=FLOAT, dtype=np.uint8, passes=False, id="float-uint8"),
-    ValidationCase(annotation=MODEL, dtype=BasicModel, passes=True),
+    ValidationCase(annotation=FLOAT, dtype=str, passes=False, id="float-str"),
-    ValidationCase(annotation=MODEL, dtype=BadModel, passes=False),
+    ValidationCase(annotation=STRING, dtype=str, passes=True, id="str-str"),
-    ValidationCase(annotation=MODEL, dtype=int, passes=False),
+    ValidationCase(annotation=STRING, dtype=int, passes=False, id="str-int"),
-    ValidationCase(annotation=MODEL, dtype=SubClass, passes=True),
+    ValidationCase(annotation=STRING, dtype=float, passes=False, id="str-float"),
-    ValidationCase(annotation=UNION_TYPE, dtype=np.uint32, passes=True),
+    ValidationCase(annotation=MODEL, dtype=BasicModel, passes=True, id="model-model"),
-    ValidationCase(annotation=UNION_TYPE, dtype=np.float32, passes=True),
+    ValidationCase(annotation=MODEL, dtype=BadModel, passes=False, id="model-badmodel"),
-    ValidationCase(annotation=UNION_TYPE, dtype=np.uint64, passes=False),
+    ValidationCase(annotation=MODEL, dtype=int, passes=False, id="model-int"),
-    ValidationCase(annotation=UNION_TYPE, dtype=np.float64, passes=False),
+    ValidationCase(annotation=MODEL, dtype=SubClass, passes=True, id="model-subclass"),
-    ValidationCase(annotation=UNION_TYPE, dtype=str, passes=False),
+    ValidationCase(
+        annotation=UNION_TYPE, dtype=np.uint32, passes=True, id="union-type-uint32"
+    ),
+    ValidationCase(
+        annotation=UNION_TYPE, dtype=np.float32, passes=True, id="union-type-float32"
+    ),
+    ValidationCase(
+        annotation=UNION_TYPE, dtype=np.uint64, passes=False, id="union-type-uint64"
+    ),
+    ValidationCase(
+        annotation=UNION_TYPE, dtype=np.float64, passes=False, id="union-type-float64"
+    ),
+    ValidationCase(annotation=UNION_TYPE, dtype=str, passes=False, id="union-type-str"),
 ]
 
 
-DTYPE_IDS = [
-    "float",
-    "int",
-    "uint8",
-    "number-int",
-    "number-float",
-    "number-uint8",
-    "number-float16",
-    "number-str",
-    "integer-int",
-    "integer-uint8",
-    "integer-float",
-    "integer-float32",
-    "integer-str",
-    "float-float",
-    "float-float32",
-    "float-int",
-    "float-uint8",
-    "float-str",
-    "str-str",
-    "str-int",
-    "str-float",
-    "model-model",
-    "model-badmodel",
-    "model-int",
-    "model-subclass",
-    "union-type-uint32",
-    "union-type-float32",
-    "union-type-uint64",
-    "union-type-float64",
-    "union-type-str",
-]
-
 if YES_PIPE:
     DTYPE_CASES.extend(
         [
-            ValidationCase(annotation=UNION_PIPE, dtype=np.uint32, passes=True),
+            ValidationCase(
-            ValidationCase(annotation=UNION_PIPE, dtype=np.float32, passes=True),
+                annotation=UNION_PIPE,
-            ValidationCase(annotation=UNION_PIPE, dtype=np.uint64, passes=False),
+                dtype=np.uint32,
-            ValidationCase(annotation=UNION_PIPE, dtype=np.float64, passes=False),
+                passes=True,
-            ValidationCase(annotation=UNION_PIPE, dtype=str, passes=False),
+                id="union-pipe-uint32",
-        ]
+            ),
-    )
+            ValidationCase(
-    DTYPE_IDS.extend(
+                annotation=UNION_PIPE,
-        [
+                dtype=np.float32,
-            "union-pipe-uint32",
+                passes=True,
-            "union-pipe-float32",
+                id="union-pipe-float32",
-            "union-pipe-uint64",
+            ),
-            "union-pipe-float64",
+            ValidationCase(
-            "union-pipe-str",
+                annotation=UNION_PIPE,
+                dtype=np.uint64,
+                passes=False,
+                id="union-pipe-uint64",
+            ),
+            ValidationCase(
+                annotation=UNION_PIPE,
+                dtype=np.float64,
+                passes=False,
+                id="union-pipe-float64",
+            ),
+            ValidationCase(
+                annotation=UNION_PIPE, dtype=str, passes=False, id="union-pipe-str"
+            ),
         ]
     )
+
+_INTERFACE_CASES = [
+    NumpyCase,
+    HDF5Case,
+    HDF5CompoundCase,
+    DaskCase,
+    ZarrCase,
+    ZarrDirCase,
+    ZarrZipCase,
+    ZarrNestedCase,
+    VideoCase,
+]
+
+
+def merged_product(
+    *args: Sequence[ValidationCase],
+) -> Generator[ValidationCase, None, None]:
+    """
+    Generator for the product of the iterators of validation cases,
+    merging each tuple, and respecting if they should be :meth:`.ValidationCase.skip`
+    or not.
+
+    Examples:
+
+        .. code-block:: python
+
+            shape_cases = [
+                ValidationCase(shape=(10, 10, 10), passes=True, id="valid shape"),
+                ValidationCase(shape=(10, 10), passes=False, id="missing dimension"),
+            ]
+            dtype_cases = [
+                ValidationCase(dtype=float, passes=True, id="float"),
+                ValidationCase(dtype=int, passes=False, id="int"),
+            ]
+
+            iterator = merged_product(shape_cases, dtype_cases))
+            next(iterator)
+            # ValidationCase(shape=(10, 10, 10), dtype=float, passes=True, id="valid shape-float")
+            next(iterator)
+            # ValidationCase(shape=(10, 10, 10), dtype=int, passes=False, id="valid shape-int")
+
+
+    """
+    iterator = product(*args)
+    for case_tuple in iterator:
+        case = merge_cases(case_tuple)
+        if case.skip():
+            continue
+        yield case

src/numpydantic/testing/helpers.py

@@ -1,10 +1,76 @@
-from typing import Any, Tuple, Type, Union
+from abc import ABC, abstractmethod
+from collections.abc import Sequence
+from pathlib import Path
+from typing import Any, Optional, Tuple, Type, Union
 
 import numpy as np
-from pydantic import BaseModel, ConfigDict, computed_field
+from pydantic import BaseModel, ConfigDict, ValidationError, computed_field
 
 from numpydantic import NDArray, Shape
 from numpydantic.dtype import Float
+from numpydantic.interface import Interface
+from numpydantic.types import NDArrayType
+
+
+class InterfaceCase(ABC):
+    """
+    An interface test helper that allows a given interface to generate and validate
+    arrays in one of its formats.
+
+    Each instance of "interface test case" should be considered one of the
+    potentially multiple realizations of a given interface.
+    If an interface has multiple formats (eg. zarr's different `store` s),
+    then it should have several test helpers.
+    """
+
+    @property
+    @abstractmethod
+    def interface(self) -> Interface:
+        """The interface that this helper is for"""
+
+    @classmethod
+    @abstractmethod
+    def generate_array(
+        cls, case: "ValidationCase", path: Path
+    ) -> Optional[NDArrayType]:
+        """
+        Generate an array from the given validation case.
+
+        Returns ``None`` if an array can't be generated for a specific case.
+        """
+
+    @classmethod
+    def validate_array(cls, case: "ValidationCase", path: Path) -> Optional[bool]:
+        """
+        Validate a generated array against the annotation in the validation case.
+
+        Kept in the InterfaceCase in case an interface has specific
+        needs aside from just validating against a model, but typically left as is.
+
+        Does not raise on Validation errors -
+        returns bool instead for consistency's sake.
+
+        If an array can't be generated for a given case, returns `None`
+        so that the calling function can know to skip rather than fail the case.
+        """
+        array = cls.generate_array(case, path)
+        if array is None:
+            return None
+        try:
+            case.model(array=array)
+            # True if case is supposed to pass, False if it's not...
+            return case.passes
+        except ValidationError:
+            # False if the case is supposed to pass, True if it is...
+            return not case.passes
+
+    @classmethod
+    def skip(cls, case: "ValidationCase") -> bool:
+        """
+        Whether a given interface should be skipped for the case
+        """
+        # Assume an interface case is valid for all other cases
+        return False
 
 
 class ValidationCase(BaseModel):
@@ -15,6 +81,10 @@ class ValidationCase(BaseModel):
     test in a given interface
     """
 
+    id: Optional[str] = None
+    """
+    String identifying the validation case
+    """
     annotation: Any = NDArray[Shape["10, 10, *"], Float]
     """
     Array annotation used in the validating model
@@ -24,8 +94,9 @@ class ValidationCase(BaseModel):
     """Shape of the array to validate"""
     dtype: Union[Type, np.dtype] = float
     """Dtype of the array to validate"""
-    passes: bool
+    passes: bool = False
     """Whether the validation should pass or not"""
+    interface: Optional[InterfaceCase] = None
 
     model_config = ConfigDict(arbitrary_types_allowed=True)
 
@@ -38,3 +109,62 @@ class ValidationCase(BaseModel):
             array: annotation
 
         return Model
+
+    def merge(
+        self, other: Union["ValidationCase", Sequence["ValidationCase"]]
+    ) -> "ValidationCase":
+        """
+        Merge two validation cases
+
+        Dump both, excluding any unset fields, and merge, preferring `other`.
+
+        ``valid`` is ``True`` if and only if it is ``True`` in both.
+        """
+        if isinstance(other, Sequence):
+            return merge_cases(self, *other)
+
+        self_dump = self.model_dump(exclude_unset=True)
+        other_dump = other.model_dump(exclude_unset=True)
+
+        # dumps might not have set `valid`, use only the ones that have
+        valids = [
+            v
+            for v in [self_dump.get("valid", None), other_dump.get("valid", None)]
+            if v is not None
+        ]
+        valid = all(valids)
+
+        # combine ids if present
+        ids = "-".join(
+            [
+                str(v)
+                for v in [self_dump.get("id", None), other_dump.get("id", None)]
+                if v is not None
+            ]
+        )
+
+        merged = {**self_dump, **other_dump}
+        merged["valid"] = valid
+        merged["id"] = ids
+        return ValidationCase(**merged)
+
+    def skip(self) -> bool:
+        """
+        Whether this case should be skipped
+        (eg. due to the interface case being incompatible
+        with the requested dtype or shape)
+        """
+        return bool(self.interface is not None and self.interface.skip())
+
+
+def merge_cases(*args: ValidationCase) -> ValidationCase:
+    """
+    Merge multiple validation cases
+    """
+    if len(args) == 1:
+        return args[0]
+
+    case = args[0]
+    for arg in args[1:]:
+        case = case.merge(arg)
+    return case

src/numpydantic/testing/interfaces.py

@@ -0,0 +1,218 @@
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Optional
+
+import cv2
+import dask.array as da
+import h5py
+import numpy as np
+import zarr
+from pydantic import BaseModel
+
+from numpydantic.interface import (
+    DaskInterface,
+    H5ArrayPath,
+    H5Interface,
+    NumpyInterface,
+    VideoInterface,
+    ZarrArrayPath,
+    ZarrInterface,
+)
+from numpydantic.testing.helpers import InterfaceCase, ValidationCase
+
+
+class NumpyCase(InterfaceCase):
+    """In-memory numpy array"""
+
+    interface = NumpyInterface
+
+    @classmethod
+    def generate_array(cls, case: "ValidationCase", path: Path) -> np.ndarray:
+        if issubclass(case.dtype, BaseModel):
+            return np.full(shape=case.shape, fill_value=case.dtype(x=1))
+        else:
+            return np.zeros(shape=case.shape, dtype=case.dtype)
+
+
+class _HDF5MetaCase(InterfaceCase):
+    """Base case for hdf5 cases"""
+
+    interface = H5Interface
+
+    @classmethod
+    def skip(cls, case: "ValidationCase") -> bool:
+        return not issubclass(case.dtype, BaseModel)
+
+
+class HDF5Case(_HDF5MetaCase):
+    """HDF5 Array"""
+
+    @classmethod
+    def generate_array(
+        cls, case: "ValidationCase", path: Path
+    ) -> Optional[H5ArrayPath]:
+        if cls.skip(case):
+            return None
+
+        hdf5_file = path / "h5f.h5"
+        array_path = (
+            "/" + "_".join([str(s) for s in case.shape]) + "__" + case.dtype.__name__
+        )
+        generator = np.random.default_rng()
+
+        if case.dtype is str:
+            data = generator.random(case.shape).astype(bytes)
+        elif case.dtype is datetime:
+            data = np.empty(case.shape, dtype="S32")
+            data.fill(datetime.now(timezone.utc).isoformat().encode("utf-8"))
+        else:
+            data = generator.random(case.shape).astype(case.dtype)
+
+        h5path = H5ArrayPath(hdf5_file, array_path)
+
+        with h5py.File(hdf5_file, "w") as h5f:
+            _ = h5f.create_dataset(array_path, data=data)
+        return h5path
+
+
+class HDF5CompoundCase(_HDF5MetaCase):
+    """HDF5 Array with a fake compound dtype"""
+
+    @classmethod
+    def generate_array(
+        cls, case: "ValidationCase", path: Path
+    ) -> Optional[H5ArrayPath]:
+        if cls.skip(case):
+            return None
+
+        hdf5_file = path / "h5f.h5"
+        array_path = (
+            "/" + "_".join([str(s) for s in case.shape]) + "__" + case.dtype.__name__
+        )
+        if case.dtype is str:
+            dt = np.dtype([("data", np.dtype("S10")), ("extra", "i8")])
+            data = np.array([("hey", 0)] * np.prod(case.shape), dtype=dt).reshape(
+                case.shape
+            )
+        elif case.dtype is datetime:
+            dt = np.dtype([("data", np.dtype("S32")), ("extra", "i8")])
+            data = np.array(
+                [(datetime.now(timezone.utc).isoformat().encode("utf-8"), 0)]
+                * np.prod(case.shape),
+                dtype=dt,
+            ).reshape(case.shape)
+        else:
+            dt = np.dtype([("data", case.dtype), ("extra", "i8")])
+            data = np.zeros(case.shape, dtype=dt)
+        h5path = H5ArrayPath(hdf5_file, array_path, "data")
+
+        with h5py.File(hdf5_file, "w") as h5f:
+            _ = h5f.create_dataset(array_path, data=data)
+        return h5path
+
+
+class DaskCase(InterfaceCase):
+    """In-memory dask array"""
+
+    interface = DaskInterface
+
+    @classmethod
+    def generate_array(cls, case: "ValidationCase", path: Path) -> da.Array:
+        if issubclass(case.dtype, BaseModel):
+            return da.full(shape=case.shape, fill_value=case.dtype(x=1), chunks=-1)
+        else:
+            return da.zeros(shape=case.shape, dtype=case.dtype, chunks=10)
+
+
+class _ZarrMetaCase(InterfaceCase):
+    """Shared classmethods for zarr cases"""
+
+    interface = ZarrInterface
+
+    @classmethod
+    def skip(cls, case: "ValidationCase") -> bool:
+        return not issubclass(case.dtype, BaseModel)
+
+
+class ZarrCase(_ZarrMetaCase):
+    """In-memory zarr array"""
+
+    @classmethod
+    def generate_array(cls, case: "ValidationCase", path: Path) -> Optional[zarr.Array]:
+        return zarr.zeros(shape=case.shape, dtype=case.dtype)
+
+
+class ZarrDirCase(_ZarrMetaCase):
+    """On-disk zarr array"""
+
+    @classmethod
+    def generate_array(cls, case: "ValidationCase", path: Path) -> ZarrArrayPath:
+        store = zarr.DirectoryStore(str(path / "array.zarr"))
+        return zarr.zeros(shape=case.shape, dtype=case.dtype, store=store)
+
+
+class ZarrZipCase(_ZarrMetaCase):
+    """Zarr zip store"""
+
+    @classmethod
+    def generate_array(cls, case: "ValidationCase", path: Path) -> ZarrArrayPath:
+        store = zarr.ZipStore(str(path / "array.zarr"), mode="w")
+        return zarr.zeros(shape=case.shape, dtype=case.dtype, store=store)
+
+
+class ZarrNestedCase(_ZarrMetaCase):
+    """Nested zarr array"""
+
+    @classmethod
+    def generate_array(cls, case: "ValidationCase", path: Path) -> ZarrArrayPath:
+        file = str(path / "nested.zarr")
+        root = zarr.open(file, mode="w")
+        subpath = "a/b/c"
+        _ = root.zeros(subpath, shape=case.shape, dtype=case.dtype)
+        return ZarrArrayPath(file=file, path=subpath)
+
+
+class VideoCase(InterfaceCase):
+    """AVI video"""
+
+    interface = VideoInterface
+
+    @classmethod
+    def generate_array(cls, case: "ValidationCase", path: Path) -> Optional[Path]:
+        if cls.skip(case):
+            return None
+
+        is_color = len(case.shape) == 4
+        frames = case.shape[0]
+        frame_shape = case.shape[1:]
+
+        video_path = path / "test.avi"
+        writer = cv2.VideoWriter(
+            str(video_path),
+            cv2.VideoWriter_fourcc(*"RGBA"),  # raw video for testing purposes
+            30,
+            (frame_shape[1], frame_shape[0]),
+            is_color,
+        )
+
+        for i in range(frames):
+            # make fresh array every time bc opencv eats them
+            array = np.zeros(frame_shape, dtype=np.uint8)
+            if not is_color:
+                array[i, i] = i
+            else:
+                array[i, i, :] = i
+            writer.write(array)
+        writer.release()
+        return video_path
+
+    @classmethod
+    def skip(cls, case: "ValidationCase") -> bool:
+        """We really can only handle 3-4 dimensional cases in 8-bit rn lol"""
+        if len(case.shape) < 3 or len(case.shape) > 4:
+            return True
+        if case.dtype not in (int, np.uint8):
+            return True
+        # if we have a color video (ie. shape == 4, needs to be RGB)
+        if len(case.shape) == 4 and case.shape[3] != 3:
+            return True

tests/conftest.py

@@ -1,10 +1,6 @@
 import pytest
 
-from numpydantic.testing.cases import (
+from numpydantic.testing.cases import DTYPE_CASES, SHAPE_CASES
-    DTYPE_CASES,
-    DTYPE_IDS,
-    RGB_UNION,
-)
 from numpydantic.testing.helpers import ValidationCase
 from tests.fixtures import *
 
@@ -17,43 +13,11 @@ def pytest_addoption(parser):
     )
 
 
-@pytest.fixture(
+@pytest.fixture(scope="module", params=SHAPE_CASES)
-    scope="module",
-    params=[
-        ValidationCase(shape=(10, 10, 10), passes=True),
-        ValidationCase(shape=(10, 10), passes=False),
-        ValidationCase(shape=(10, 10, 10, 10), passes=False),
-        ValidationCase(shape=(11, 10, 10), passes=False),
-        ValidationCase(shape=(9, 10, 10), passes=False),
-        ValidationCase(shape=(10, 10, 9), passes=True),
-        ValidationCase(shape=(10, 10, 11), passes=True),
-        ValidationCase(annotation=RGB_UNION, shape=(5, 5), passes=True),
-        ValidationCase(annotation=RGB_UNION, shape=(5, 5, 3), passes=True),
-        ValidationCase(annotation=RGB_UNION, shape=(5, 5, 3, 4), passes=True),
-        ValidationCase(annotation=RGB_UNION, shape=(5, 5, 4), passes=False),
-        ValidationCase(annotation=RGB_UNION, shape=(5, 5, 3, 6), passes=False),
-        ValidationCase(annotation=RGB_UNION, shape=(5, 5, 4, 6), passes=False),
-    ],
-    ids=[
-        "valid shape",
-        "missing dimension",
-        "extra dimension",
-        "dimension too large",
-        "dimension too small",
-        "wildcard smaller",
-        "wildcard larger",
-        "Union 2D",
-        "Union 3D",
-        "Union 4D",
-        "Union incorrect 3D",
-        "Union incorrect 4D",
-        "Union incorrect both",
-    ],
-)
 def shape_cases(request) -> ValidationCase:
     return request.param
 
 
-@pytest.fixture(scope="module", params=DTYPE_CASES, ids=DTYPE_IDS)
+@pytest.fixture(scope="module", params=DTYPE_CASES)
 def dtype_cases(request) -> ValidationCase:
     return request.param