validate: miscellaneous Python cleanups

I spent too much time trying to navigate validate Python code to figure
out where a test was coming from. Hoping that it's slightly easier for
the next person, this patch:

* Adds type annotations to setup_tests(), for the sake of code
  navigation.
* Adds comments matching each test generator with the patterns of test
  names it produces.
* Removes an if statement in `register_default_scenarios()` where both
  branches have the same exact code with the same exact very long list.
* Removes NamedDic [sic] and replaces it with SimpleNamespace from the
  standard library (3.3+) which has the same purpose and API.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8090>

subprojects/gst-devtools/validate/launcher/apps/gstvalidate.py

@@ -22,6 +22,7 @@ import os
 import copy
 import sys
 import time
+from types import SimpleNamespace
 import urllib.parse
 import shlex
 import socket
@@ -33,7 +34,7 @@ import math
 from launcher.loggable import Loggable, error
 
 from launcher.baseclasses import GstValidateTest, Test, \
-    ScenarioManager, NamedDic, GstValidateTestsGenerator, \
+    ScenarioManager, GstValidateTestsGenerator, \
     GstValidateMediaDescriptor, GstValidateEncodingTestInterface, \
     GstValidateBaseTestManager, MediaDescriptor, MediaFormatCombination, VariableFramerateMode
 
@@ -488,8 +489,8 @@ class GstValidatePlaybinTestsGenerator(GstValidatePipelineTestsGenerator):
                               )
 
                 if test_rtsp and protocol == Protocols.FILE and not minfo.media_descriptor.is_image():
-                    rtspminfo = NamedDic({"path": minfo.media_descriptor.get_path(),
+                    rtspminfo = SimpleNamespace(path=minfo.media_descriptor.get_path(),
-                                          "media_descriptor": GstValidateRTSPMediaDescriptor(minfo.media_descriptor.get_path())})
+                                                media_descriptor=GstValidateRTSPMediaDescriptor(minfo.media_descriptor.get_path()))
                     if not rtspminfo.media_descriptor.is_compatible(scenario):
                         self.debug("Skipping (media descriptor is not compatible for rtsp test): %s", fname)
                         continue
@@ -1133,8 +1134,8 @@ not been tested and explicitly activated if you set use --wanted-tests ALL""")
             special_scenarios = self.scenarios_manager.find_special_scenarios(
                 scenario_bname)
             self._uris.append((uri,
-                               NamedDic({"path": media_info,
+                               SimpleNamespace(path=media_info,
-                                         "media_descriptor": media_descriptor}),
+                                               media_descriptor=media_descriptor),
                                special_scenarios))
         except configparser.NoOptionError as e:
             self.debug("Exception: %s for %s", e, media_info)
@@ -1276,22 +1277,6 @@ not been tested and explicitly activated if you set use --wanted-tests ALL""")
         """
         Registers default test scenarios
         """
-        if self.options.long_limit != 0:
-            self.add_scenarios([
-                "play_15s",
-                "reverse_playback",
-                "fast_forward",
-                "seek_forward",
-                "seek_backward",
-                "seek_with_stop",
-                "switch_audio_track",
-                "switch_audio_track_while_paused",
-                "switch_subtitle_track",
-                "switch_subtitle_track_while_paused",
-                "disable_subtitle_track_while_paused",
-                "change_state_intensive",
-                "scrub_forward_seeking"])
-        else:
         self.add_scenarios([
             "play_15s",
             "reverse_playback",
@@ -1387,7 +1372,12 @@ not been tested and explicitly activated if you set use --wanted-tests ALL""")
         if self._default_generators_registered:
             return
 
-        self.add_generators([GstValidatePlaybinTestsGenerator(self),
+        self.add_generators([
+            # <testsuitename>.*.playback.*
+            GstValidatePlaybinTestsGenerator(self),
+            # <testsuitename>.*.media_check.*
             GstValidateMediaCheckTestsGenerator(self),
-                             GstValidateTranscodingTestsGenerator(self)])
+            # <testsuitename>.*.transcode.to_*.*
+            GstValidateTranscodingTestsGenerator(self)
+        ])
         self._default_generators_registered = True

subprojects/gst-devtools/validate/launcher/baseclasses.py

@@ -2402,14 +2402,6 @@ class _TestsLauncher(Loggable):
                 return True
 
 
-class NamedDic(object):
-
-    def __init__(self, props):
-        if props:
-            for name, value in props.items():
-                setattr(self, name, value)
-
-
 class Scenario(object):
 
     def __init__(self, name, props, path=None):

subprojects/gst-integration-testsuites/testsuites/validate.py

@@ -20,6 +20,7 @@
 """
 The GstValidate default testsuite
 """
+from __future__ import annotations
 
 import os
 import glob
@@ -30,8 +31,11 @@ import subprocess
 from testsuiteutils import update_assets
 from launcher import utils
 from launcher.baseclasses import MediaFormatCombination
-from launcher.apps.gstvalidate import GstValidateSimpleTestsGenerator
+from launcher.apps.gstvalidate import GstValidateSimpleTestsGenerator, GstValidateTestManager
 from validate_known_issues import KNOWN_ISSUES
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    from launcher.main import LauncherConfig
 
 
 TEST_MANAGER = "validate"
@@ -96,7 +100,7 @@ def add_accurate_seek_tests(test_manager, media_dir, extra_data):
     )
 
 
-def setup_tests(test_manager, options):
+def setup_tests(test_manager: GstValidateTestManager, options: LauncherConfig):
     testsuite_dir = os.path.realpath(os.path.join(os.path.dirname(__file__)))
     media_dir = os.path.realpath(os.path.join(testsuite_dir, os.path.pardir, "medias"))