TST/CI: mark some tests as slow and avoid running them in wheel builds and Emscripten job

.github/workflows/emscripten.yml

@@ -70,7 +70,7 @@ jobs:
           pushd demo
           pip install matplotlib pytest
           python -c "import pywt; print(pywt.__version__)"
-          pytest --pyargs pywt
+          pytest --pyargs pywt -m "not slow"
 
         # https://anaconda.org/scientific-python-nightly-wheels/pywavelets
         # WARNING: this job will overwrite existing wheels.

.github/workflows/wheel_tests_and_release.yml

@@ -8,7 +8,7 @@ env:
   CIBW_BUILD_VERBOSITY: 2
   # CIBW_BEFORE_BUILD: pip install cython
   CIBW_TEST_REQUIRES: pytest
-  CIBW_TEST_COMMAND: pytest --pyargs pywt
+  CIBW_TEST_COMMAND: pytest --pyargs pywt -m "not slow"
   CIBW_ENVIRONMENT: PIP_PREFER_BINARY=1
 
 jobs:

pywt/tests/test_mra.py

@@ -174,6 +174,7 @@ def test_mra2_axes(transform, axes, ndim, dtype):
 # nd mra tests
 ####
 
+@pytest.mark.slow
 @pytest.mark.parametrize('wavelet', ['sym2', ])
 @pytest.mark.parametrize('transform', ['dwtn', 'swtn'])
 @pytest.mark.parametrize('mode', pywt.Modes.modes)

pywt/tests/test_perfect_reconstruction.py

@@ -6,11 +6,13 @@
 
 
 import numpy as np
+import pytest
 from numpy.testing import assert_
 
 import pywt
 
 
+@pytest.mark.slow
 def test_perfect_reconstruction():
     families = ('db', 'sym', 'coif', 'bior', 'rbio')
     wavelets = sum([pywt.wavelist(name) for name in families], [])