chore: migrate to pytest-doctestplus

.github/CONTRIBUTING.md

@@ -94,7 +94,7 @@ If you would like to skip the failing checks and push the code for further discu
 
 ## Testing vector
 
-`vector` is tested using `pytest` and `xdoctest`. `pytest` is responsible for testing the code, whose configuration is available in [pyproject.toml](https://github.com/scikit-hep/vector/blob/main/pyproject.toml).`xdoctest` is responsible for testing the examples available in every docstring, which prevents them from going stale. Additionally, `vector` also uses `pytest-cov` to calculate the coverage of these unit tests.
+`vector` is tested using `pytest` and `pytest-doctestplus`. `pytest` is responsible for testing the code, whose configuration is available in [pyproject.toml](https://github.com/scikit-hep/vector/blob/main/pyproject.toml).`pytest-doctestplus` is responsible for testing the examples available in every docstring, which prevents them from going stale. Additionally, `vector` also uses `pytest-cov` to calculate the coverage of these unit tests.
 
 ### Running tests locally
 
@@ -119,13 +119,13 @@ python -m pytest --cov=vector tests/
 The doctests can be executed using the `test` dependencies of `vector` in the following way -
 
 ```bash
-xdoctest ./src/vector/
+python -m pytest --doctest-plus src/vector/
 ```
 
 or, one can run the doctests along with the unit tests in the following way -
 
 ```bash
-python -m pytest --xdoctest .
+python -m pytest --doctest-plus .
 ```
 
 A much more detailed guide on testing with `pytest` for `Scikit-HEP` packages is available [here](https://scikit-hep.org/developer/pytest).

.github/PULL_REQUEST_TEMPLATE.md

@@ -11,7 +11,7 @@ _Please describe the purpose of this pull request. Reference and link to any rel
 - [ ] Does your submission pass pre-commit? (`$ pre-commit run --all-files` or `$ nox -s lint`)
 - [ ] Does your submission pass tests? (`$ pytest` or `$ nox -s tests`)
 - [ ] Does the documentation build with your changes? (`$ cd docs; make clean; make html` or `$ nox -s docs`)
-- [ ] Does your submission pass the doctests? (`$ xdoctest ./src/vector` or `$ nox -s doctests`)
+- [ ] Does your submission pass the doctests? (`$ pytest --doctest-plus src/vector/` or `$ nox -s doctests`)
 
 ## Before Merging
 

.github/workflows/ci.yml

@@ -86,8 +86,12 @@ jobs:
       - name: Install awkward v1
         run: python -m pip install -U "awkward<2"
 
+      - name: Run doctests on Python 3.11 with awkward v1.x
+        if: matrix.python-version == '3.11'
+        run: python -m pytest -ra --doctest-plus src/vector/
+
       - name: Test package with awkward v1.x
-        run: python -m pytest -ra --cov=vector --xdoctest --ignore tests/test_notebooks.py .
+        run: python -m pytest -ra --cov=vector --ignore tests/test_notebooks.py .
 
   check-awkward-v2:
     needs: [check-light]
@@ -118,8 +122,12 @@ jobs:
       - name: Install awkward v2
         run: python -m pip install -U --pre "awkward>=2.0.0rc1"
 
+      - name: Run doctests on Python 3.11 with awkward v2.x
+        if: matrix.python-version == 3.11
+        run: python -m pytest -ra --doctest-plus src/vector/
+
       - name: Test package with awkward v2.x
-        run: python -m pytest -ra --cov=vector --xdoctest --ignore tests/test_notebooks.py .
+        run: python -m pytest -ra --cov=vector --ignore tests/test_notebooks.py .
 
       - name: Upload coverage report
         uses: codecov/codecov-action@v3.1.4

noxfile.py

@@ -45,7 +45,7 @@ def coverage(session: nox.Session) -> None:
 def doctests(session: nox.Session) -> None:
     """Run the doctests."""
     session.install("-e", ".[awkward,test,test-extras]")
-    session.run("xdoctest", "./src/vector/", *session.posargs)
+    session.run("pytest", "--doctest-plus", "src/vector/", *session.posargs)
 
 
 @nox.session(python=ALL_PYTHONS, reuse_venv=True)

pyproject.toml

@@ -47,11 +47,12 @@ awkward = [
 ]
 dev = [
   "awkward>=1.2",
+  "nox",
   'numba>=0.57; python_version < "3.12"',
   "papermill>=2.4",
   "pytest>=6",
   "pytest-cov>=3",
-  "xdoctest>=1",
+  "pytest-doctestplus",
 ]
 docs = [
   "awkward>=1.2",
@@ -64,10 +65,11 @@ docs = [
   "sphinx_copybutton",
 ]
 test = [
+  "nox",
   "papermill>=2.4",
   "pytest>=6",
   "pytest-cov>=3",
-  "xdoctest>=1",
+  "pytest-doctestplus",
 ]
 test-extras = [
   "spark-parser",

src/vector/backends/awkward.py

@@ -122,8 +122,7 @@ def from_fields(cls, array: ak.Array) -> AzimuthalAwkward:
             >>> az
             AzimuthalAwkwardXY(<Array [[1, 2], None] type='2 * option[var * int64]'>, <Array [None, [1]] type='2 * option[var * int64]'>)
             >>> az.elements
-            (<Array [[1, 2], None] type='2 * option[var * int64]'>, <Array [None, [1]] type='2 * option[var
-            * int64]'>)
+            (<Array [[1, 2], None] type='2 * option[var * int64]'>, <Array [None, [1]] type='2 * option[var * int64]'>)
         """
         fields = ak.fields(array)
         if "x" in fields and "y" in fields:
@@ -151,8 +150,7 @@ def from_momentum_fields(cls, array: ak.Array) -> AzimuthalAwkward:
             >>> az
             AzimuthalAwkwardXY(<Array [[1, 2], None] type='2 * option[var * int64]'>, <Array [None, [1]] type='2 * option[var * int64]'>)
             >>> az.elements
-            (<Array [[1, 2], None] type='2 * option[var * int64]'>, <Array [None, [1]] type='2 * option[var
-            * int64]'>)
+            (<Array [[1, 2], None] type='2 * option[var * int64]'>, <Array [None, [1]] type='2 * option[var * int64]'>)
         """
         fields = ak.fields(array)
         if "x" in fields and "y" in fields:

src/vector/backends/numpy.py

@@ -426,7 +426,7 @@ class AzimuthalNumpyXY(AzimuthalNumpy, AzimuthalXY, GetItem, FloatArray):  # typ
         >>> import vector
         >>> vector.backends.numpy.AzimuthalNumpyXY([(1, 1), (2.1, 3.1)], dtype=[("x", float), ("y", float)])
         AzimuthalNumpyXY([(1. , 1. ), (2.1, 3.1)],
-                        dtype=[('x', '<f8'), ('y', '<f8')])
+                         dtype=[('x', '<f8'), ('y', '<f8')])
     """
 
     ObjectClass = vector.backends.object.AzimuthalObjectXY
@@ -477,7 +477,7 @@ class AzimuthalNumpyRhoPhi(AzimuthalNumpy, AzimuthalRhoPhi, GetItem, FloatArray)
         >>> import vector
         >>> vector.backends.numpy.AzimuthalNumpyRhoPhi([(1, 1), (2.1, 3.1)], dtype=[("rho", float), ("phi", float)])
         AzimuthalNumpyRhoPhi([(1. , 1. ), (2.1, 3.1)],
-                            dtype=[('rho', '<f8'), ('phi', '<f8')])
+                             dtype=[('rho', '<f8'), ('phi', '<f8')])
     """
 
     ObjectClass = vector.backends.object.AzimuthalObjectRhoPhi
@@ -1036,7 +1036,7 @@ class VectorNumpy2D(VectorNumpy, Planar, Vector2D, FloatArray):  # type: ignore[
         ...               dtype=[('x', float), ('y', float)])
         >>> vec
         VectorNumpy2D([(1.1, 2.1), (1.2, 2.2), (1.3, 2.3), (1.4, 2.4), (1.5, 2.5)],
-                    dtype=[('x', '<f8'), ('y', '<f8')])
+                      dtype=[('x', '<f8'), ('y', '<f8')])
     """
 
     ObjectClass = vector.backends.object.VectorObject2D
@@ -1088,7 +1088,7 @@ def azimuthal(self) -> AzimuthalNumpy:
             ... ], dtype=[("x", float), ("y", float)])
             >>> vec.azimuthal
             AzimuthalNumpyXY([(1.1, 2.1), (1.2, 2.2), (1.3, 2.3), (1.4, 2.4),
-                            (1.5, 2.5)], dtype=[('x', '<f8'), ('y', '<f8')])
+                              (1.5, 2.5)], dtype=[('x', '<f8'), ('y', '<f8')])
         """
         return self.view(self._azimuthal_type)  # type: ignore[return-value]
 
@@ -1259,7 +1259,7 @@ class VectorNumpy3D(VectorNumpy, Spatial, Vector3D, FloatArray):  # type: ignore
         ...               dtype=[('x', float), ('y', float), ('z', float)])
         >>> vec
         VectorNumpy3D([(1.1, 2.1, 3.1), (1.2, 2.2, 3.2), (1.3, 2.3, 3.3), (1.4, 2.4, 3.4),
-                    (1.5, 2.5, 3.5)], dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8')])
+                       (1.5, 2.5, 3.5)], dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8')])
     """
 
     ObjectClass = vector.backends.object.VectorObject3D
@@ -1465,7 +1465,7 @@ class MomentumNumpy3D(SpatialMomentum, VectorNumpy3D):  # type: ignore[misc]
         ...               dtype=[('px', float), ('py', float), ('pz', float)])
         >>> vec
         MomentumNumpy3D([(1.1, 2.1, 3.1), (1.2, 2.2, 3.2), (1.3, 2.3, 3.3), (1.4, 2.4, 3.4),
-                        (1.5, 2.5, 3.5)], dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8')])
+                         (1.5, 2.5, 3.5)], dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8')])
     """
 
     ObjectClass = vector.backends.object.MomentumObject3D
@@ -1524,8 +1524,8 @@ class VectorNumpy4D(VectorNumpy, Lorentz, Vector4D, FloatArray):  # type: ignore
         ...               dtype=[('x', float), ('y', float), ('z', float), ('t', float)])
         >>> vec
         VectorNumpy4D([(1.1, 2.1, 3.1, 4.1), (1.2, 2.2, 3.2, 4.2), (1.3, 2.3, 3.3, 4.3),
-                    (1.4, 2.4, 3.4, 4.4), (1.5, 2.5, 3.5, 4.5)],
-                    dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8'), ('t', '<f8')])
+                       (1.4, 2.4, 3.4, 4.4), (1.5, 2.5, 3.5, 4.5)],
+                      dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8'), ('t', '<f8')])
     """
 
     ObjectClass = vector.backends.object.VectorObject4D
@@ -1783,7 +1783,7 @@ class MomentumNumpy4D(LorentzMomentum, VectorNumpy4D):  # type: ignore[misc]
         ...               dtype=[('px', float), ('py', float), ('pz', float), ('t', float)])
         >>> vec
         MomentumNumpy4D([(1.1, 2.1, 3.1, 4.1), (1.2, 2.2, 3.2, 4.2), (1.3, 2.3, 3.3, 4.3),
-                        (1.4, 2.4, 3.4, 4.4), (1.5, 2.5, 3.5, 4.5)],
+                         (1.4, 2.4, 3.4, 4.4), (1.5, 2.5, 3.5, 4.5)],
                         dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8'), ('t', '<f8')])
     """
 

src/vector/backends/object.py

@@ -878,6 +878,7 @@ class VectorObject3D(VectorObject, Spatial, Vector3D):
         ...     longitudinal=vector.backends.object.LongitudinalObjectTheta(3)
         ... )
         >>> vec.x, vec.y, vec.theta
+        (1, 2, 3)
 
 
     The following class methods can also be used to