chore: optimise unit tests (#2293)

* optimise unit tests - Cache loading the config TOML

Unit test time: 13.1s -> 10.5s

* optimise unit tests - use the same pyproject validator across the tests

Unit test time: 10.5s -> 5.7s

* optimise unit tests - selector optimisation

Unit test time: 5.7s -> 5.1s

* optimise unit tests - build options computation cache

Unit test time: 5.1s -> 3.2s

* Use functools.cache rather than functools.lru_cache

* Don't overwrite build_options when applying functools.cache

cibuildwheel/options.py

@@ -591,6 +591,10 @@ class Options:
         except FileNotFoundError:
             self.pyproject_toml = None
 
+        # cache the build options method so repeated calls don't need to
+        # resolve the options again
+        self.build_options = functools.cache(self._compute_build_options)
+
     @functools.cached_property
     def config_file_path(self) -> Path | None:
         args = self.command_line_arguments
@@ -667,9 +671,11 @@ class Options:
             allow_empty=allow_empty,
         )
 
-    def build_options(self, identifier: str | None) -> BuildOptions:
+    def _compute_build_options(self, identifier: str | None) -> BuildOptions:
         """
-        Compute BuildOptions for a single run configuration.
+        Compute BuildOptions for a single run configuration. Normally accessed
+        through the `build_options` method, which is the same but the result
+        is cached.
         """
 
         with self.reader.identifier(identifier):

cibuildwheel/selector.py

@@ -1,7 +1,7 @@
-import fnmatch
 import itertools
 from dataclasses import dataclass
 from enum import Enum
+from fnmatch import fnmatch
 from typing import Any
 
 import bracex
@@ -18,9 +18,10 @@ def selector_matches(patterns: str, string: str) -> bool:
     expansion. For example, 'cp{36,37}-*' would match either of 'cp36-*' or
     'cp37-*'.
     """
+
     patterns_list = patterns.split()
     expanded_patterns = itertools.chain.from_iterable(bracex.expand(p) for p in patterns_list)
-    return any(fnmatch.fnmatch(string, pat) for pat in expanded_patterns)
+    return any(fnmatch(string, pat) for pat in expanded_patterns)
 
 
 class EnableGroup(Enum):
@@ -59,15 +60,11 @@ class BuildSelector:
                 return False
 
         # filter out groups that are not enabled
-        if EnableGroup.CPythonFreeThreading not in self.enable and selector_matches(
-            "cp3??t-*", build_id
-        ):
+        if EnableGroup.CPythonFreeThreading not in self.enable and fnmatch(build_id, "cp3??t-*"):
             return False
-        if EnableGroup.CPythonPrerelease not in self.enable and selector_matches(
-            "cp314*", build_id
-        ):
+        if EnableGroup.CPythonPrerelease not in self.enable and fnmatch(build_id, "cp314*"):
             return False
-        if EnableGroup.PyPy not in self.enable and selector_matches("pp*", build_id):
+        if EnableGroup.PyPy not in self.enable and fnmatch(build_id, "pp*"):
             return False
 
         should_build = selector_matches(self.build_config, build_id)

cibuildwheel/util/resources.py

@@ -1,3 +1,4 @@
+import functools
 import tomllib
 from pathlib import Path
 from typing import Final
@@ -16,6 +17,8 @@ VIRTUALENV: Final[Path] = PATH / "virtualenv.toml"
 CIBUILDWHEEL_SCHEMA: Final[Path] = PATH / "cibuildwheel.schema.json"
 
 
+# this value is cached because it's used a lot in unit tests
+@functools.cache
 def read_python_configs(config: PlatformName) -> list[dict[str, str]]:
     with BUILD_PLATFORMS.open("rb") as f:
         loaded_file = tomllib.load(f)