Refactor Scan tests

- Move test description comments to docstrings - Move optimization tests to `test_opt` - Move `aesara.scan.views` tests to a new `test_views` - Move example-based tests (i.e. mostly non-functionality-focused tests) to a distinct test suite/class - Make rewrite tests specify the presence of the relevant rewrites (assuming that those tests even rely on their namesake rewrites, of course) - Miscellaneous test updates

Refactor Scan tests
8509cd13 · Brandon T. Willard · Brandon T. Willard · 31ac6dc7 · 8509cd13 · 8509cd13
--- a/aesara/scan/opt.py
+++ b/aesara/scan/opt.py
@@ -392,8 +392,8 @@ def push_out_non_seq_scan(fgraph, node):
 def push_out_seq_scan(fgraph, node):
    r"""Push out the variables inside the `Scan` that depend only on constants and sequences.
-    This optimization resembles `PushOutNonSeqScan` but it tries to push, out of
+    This optimization resembles `push_out_non_seq_scan` but it tries to push--out of
-    the inner function, the computation that only relies on sequence and
+    the inner function--the computation that only relies on sequence and
    non-sequence inputs. The idea behind this optimization is that, when it is
    possible to do so, it is generally more computationally efficient to perform
    a single operation on a large tensor rather then perform that same operation

--- a/tests/scan/test_basic.py
+++ b/tests/scan/test_basic.py
--- a/tests/scan/test_opt.py
+++ b/tests/scan/test_opt.py
--- a/tests/scan/test_views.py
+++ b/tests/scan/test_views.py