build: test light-threads on all versions of Python

And also use more compact tox environment syntax throughout tox.init

Author: nedbat

tests/test_concurrency.py

@@ -192,7 +192,8 @@ def cant_trace_msg(concurrency: str, the_module: ModuleType | None) -> str | Non
         expected_out = None
     else:
         expected_out = (
-            f"Can't support concurrency={concurrency} with PyTracer, only threads are supported.\n"
+            f"Can't support concurrency={concurrency} with {testenv.REQUESTED_TRACER_CLASS}, "
+            + "only threads are supported.\n"
         )
     return expected_out
 
@@ -350,9 +351,10 @@ def gwork(q):
             pytest.skip("Can't run test without gevent installed.")
         if not testenv.C_TRACER:
             assert out == (
-                "Can't support concurrency=gevent with PyTracer, only threads are supported.\n"
+                f"Can't support concurrency=gevent with {testenv.REQUESTED_TRACER_CLASS}, "
+                + "only threads are supported.\n"
             )
-            pytest.skip("Can't run gevent with PyTracer")
+            pytest.skip(f"Can't run gevent with {testenv.REQUESTED_TRACER_CLASS}.")
 
         assert out == "done\n"
 

tests/testenv.py

@@ -9,6 +9,12 @@
 
 REQUESTED_CORE = os.getenv("COVERAGE_CORE", "ctrace")
 
+REQUESTED_TRACER_CLASS = {
+    "ctrace": "CTracer",
+    "pytrace": "PyTracer",
+    "sysmon": "SysMonitor",
+}[REQUESTED_CORE]
+
 # Are we testing the C-implemented trace function?
 C_TRACER = REQUESTED_CORE == "ctrace"
 

tox.ini

@@ -20,7 +20,7 @@ extras =
 deps =
     -r requirements/pip.pip
     -r requirements/pytest.pip
-    py3{10,11}: -r requirements/light-threads.pip
+    py3{10,11,12,13,14}: -r requirements/light-threads.pip
 
 # Windows can't update the pip version with pip running, so use Python
 # to install things.