Restructure the test suite to follow the code

.github/workflows/tests.yml

@@ -41,12 +41,10 @@ jobs:
             pymc/tests/distributions/test_logprob.py
             pymc/tests/test_aesaraf.py
             pymc/tests/test_math.py
-            pymc/tests/test_posdef_sym.py
-            pymc/tests/test_ndarray_backend.py
+            pymc/tests/backends/test_ndarray.py
             pymc/tests/test_hmc.py
             pymc/tests/test_func_utils.py
             pymc/tests/distributions/test_shape_utils.py
-            pymc/tests/test_starting.py
             pymc/tests/distributions/test_mixture.py
 
           - |
@@ -59,27 +57,28 @@ jobs:
             pymc/tests/distributions/test_simulator.py
 
           - |
-            pymc/tests/test_tuning.py
+            pymc/tests/tuning/test_scaling.py
+            pymc/tests/tuning/test_starting.py
             pymc/tests/test_shared.py
             pymc/tests/test_types.py
 
           - |
-            pymc/tests/test_modelcontext.py
             pymc/tests/distributions/test_dist_math.py
-            pymc/tests/test_minibatches.py
-            pymc/tests/test_pickling.py
             pymc/tests/distributions/test_transform.py
             pymc/tests/test_parallel_sampling.py
             pymc/tests/test_printing.py
 
           - |
             pymc/tests/distributions/test_timeseries.py
-            pymc/tests/test_gp.py
+            pymc/tests/gp/test_cov.py
+            pymc/tests/gp/test_gp.py
+            pymc/tests/gp/test_mean.py
+            pymc/tests/gp/test_util.py
             pymc/tests/test_model.py
             pymc/tests/test_model_graph.py
-            pymc/tests/test_ode.py
-            pymc/tests/test_profile.py
-            pymc/tests/test_quadpotential.py
+            pymc/tests/ode/test_ode.py
+            pymc/tests/ode/test_utils.py
+            pymc/tests/step_methods/hmc/test_quadpotential.py
 
       fail-fast: false
     runs-on: ${{ matrix.os }}
@@ -147,8 +146,8 @@ jobs:
         python-version: ["3.8"]
         test-subset:
           - pymc/tests/test_variational_inference.py pymc/tests/test_initial_point.py
-          - pymc/tests/test_pickling.py pymc/tests/test_profile.py pymc/tests/test_step.py
-          - pymc/tests/test_gp.py pymc/tests/test_ode.py pymc/tests/test_smc.py pymc/tests/test_parallel_sampling.py
+          - pymc/tests/test_model.py pymc/tests/test_step.py
+          - pymc/tests/gp/test_cov.py pymc/tests/gp/test_gp.py pymc/tests/gp/test_mean.py pymc/tests/gp/test_util.py pymc/tests/ode/test_ode.py pymc/tests/ode/test_utils.py pymc/tests/test_smc.py pymc/tests/test_parallel_sampling.py
           - pymc/tests/test_sampling.py pymc/tests/test_posteriors.py
 
       fail-fast: false
@@ -220,15 +219,15 @@ jobs:
         test-subset:
           - |
             pymc/tests/test_parallel_sampling.py
-            pymc/tests/test_data_container.py
+            pymc/tests/test_data.py
             pymc/tests/test_missing.py
 
           - |
             pymc/tests/test_sampling.py
 
           - |
-            pymc/tests/test_idata_conversion.py
-            pymc/tests/test_updates.py
+            pymc/tests/backends/test_arviz.py
+            pymc/tests/variational/test_updates.py
       fail-fast: false
     runs-on: ${{ matrix.os }}
     env:
@@ -361,7 +360,7 @@ jobs:
         floatx: [float32]
         python-version: ["3.10"]
         test-subset:
-        - pymc/tests/test_sampling.py pymc/tests/test_ode.py
+        - pymc/tests/test_sampling.py pymc/tests/ode/test_ode.py pymc/tests/ode/test_utils.py
       fail-fast: false
     runs-on: ${{ matrix.os }}
     env:

pymc/tests/test_ndarray_backend.py → pymc/tests/backends/test_ndarray.py

@@ -17,7 +17,7 @@
 import pytest
 
 from pymc.backends import base, ndarray
-from pymc.tests import backend_fixtures as bf
+from pymc.tests.backends import fixtures as bf
 
 STATS1 = [{"a": np.float64, "b": bool}]
 

pymc/tests/distributions/test_multivariate.py

@@ -36,6 +36,7 @@
 from pymc.distributions.multivariate import (
     _LKJCholeskyCov,
     _OrderedMultinomial,
+    posdef,
     quaddist_matrix,
 )
 from pymc.distributions.shape_utils import change_dist_size, to_tuple
@@ -1874,3 +1875,21 @@ def test_car_rng_fn(sparse):
         )
         f -= 1
     assert p > delta
+
+
+@pytest.mark.parametrize(
+    "matrix, result",
+    [
+        ([[1.0, 0], [0, 1]], 1),
+        ([[1.0, 2], [2, 1]], 0),
+        ([[1.0, 1], [1, 1]], 0),
+        ([[1, 0.99, 1], [0.99, 1, 0.999], [1, 0.999, 1]], 0),
+    ],
+)
+def test_posdef_symmetric(matrix, result):
+    """The test returns 0 if the matrix has 0 eigenvalue.
+
+    Is this correct?
+    """
+    data = np.array(matrix, dtype=aesara.config.floatX)
+    assert posdef(data) == result