Add a pre-release CI job

.github/workflows/pip.yml

@@ -18,6 +18,7 @@ jobs:
         python-version: ['3.10', '3.11']
         os:  [ubuntu-latest]
         pytest: ['"pytest<8.0"', pytest]
+        pre: ['', '--pre']
 
     steps:
     # actions/setup-python@v5 has built-in functionality for caching and restoring dependencies. 
@@ -32,8 +33,13 @@ jobs:
     - name: Install core dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install ${{matrix.pytest}}
-        python -m pip install -e .
+        python -m pip install ${{matrix.pytest}} ${{matrix.pre}}
+        python -m pip install -e . ${{matrix.pre}}
+
+    - name: Echo versions
+      run: |
+        python -m pytest --version
+        python -c"import numpy; print(f'{numpy.__version__ = }')"
 
     # Run self-tests without Scipy and MPL
     # Tests that require Scipy and MPL will be skipped
@@ -61,7 +67,7 @@ jobs:
 
     - name: Test testfile CLI
       run: |
-        python -m scpdt ./scpdt/tests/scipy_linalg_tutorial_clone.rst -v
+        python -m scpdt ./scpdt/tests/scipy_ndimage_tutorial_clone.rst -v
 
     - name: Run testmod a scipy submodule
       run: |

scpdt/tests/module_cases.py

@@ -3,6 +3,9 @@
     'func7', 'manip_printoptions', 'array_abbreviation'
 ]
 
+import numpy as np
+import pytest
+
 def func():
     """
     >>> 2 / 3
@@ -171,16 +174,19 @@ def nan_equal():
     >>> import numpy as np
     >>> np.nan
     np.float64(nan)
+    """
 
+
+def test_cmplx_nan():
+    """
     Complex nans
+    >>> import numpy as np
     >>> np.nan - 1j*np.nan
     nan + nanj
 
     >>> np.nan + 1j*np.nan
     np.complex128(nan+nanj)
 
-    Throw in infs, for a good measure
-    >>> np.inf + 1j*np.inf
-    inf + infj
-
+    >>> 1j*np.complex128(np.nan)
+    np.complex128(nan+nanj)
     """