move coveragrc to pyproject.toml

ci.sh

@@ -128,17 +128,17 @@ else
 
     echo "::endgroup::"
     echo "::group:: Run Tests"
-    if COVERAGE_PROCESS_START=$(pwd)/../.coveragerc coverage run --rcfile=../.coveragerc -m pytest -r a -p trio._tests.pytest_plugin --junitxml=../test-results.xml --run-slow ${INSTALLDIR} --verbose --durations=10 $flags; then
+    if COVERAGE_PROCESS_START=$(pwd)/../pyproject.toml coverage run --rcfile=../pyproject.toml -m pytest -r a -p trio._tests.pytest_plugin --junitxml=../test-results.xml --run-slow ${INSTALLDIR} --verbose --durations=10 $flags; then
         PASSED=true
     else
         PASSED=false
     fi
     echo "::endgroup::"
     echo "::group::Coverage"
 
-    coverage combine --rcfile ../.coveragerc
-    coverage report -m --rcfile ../.coveragerc
-    coverage xml --rcfile ../.coveragerc
+    coverage combine --rcfile ../pyproject.toml
+    coverage report -m --rcfile ../pyproject.toml
+    coverage xml --rcfile ../pyproject.toml
 
     # Remove the LSP again; again we want to do this ASAP to avoid
     # accidentally breaking other stuff.

newsfragments/2867.misc.rst

@@ -0,0 +1 @@
+Move .coveragerc into pyproject.toml

pyproject.toml

@@ -230,3 +230,42 @@ showcontent = true
 directory = "misc"
 name = "Miscellaneous internal changes"
 showcontent = true
+
+[tool.coverage.run]
+branch = true
+source = ["trio"]
+omit = [
+    # These are run in subprocesses, but still don't work. We follow
+    # coverage's documentation to no avail.
+    "*/trio/_core/_tests/test_multierror_scripts/*",
+    # Omit the generated files in trio/_core starting with _generated_
+    "*/trio/_core/_generated_*",
+    # Script used to check type completeness that isn't run in tests
+    "*/trio/_tests/check_type_completeness.py",
+]
+# The test suite spawns subprocesses to test some stuff, so make sure
+# this doesn't corrupt the coverage files
+parallel = true
+
+[tool.coverage.report]
+precision = 1
+skip_covered = true
+exclude_lines = [
+    "pragma: no cover",
+    "abc.abstractmethod",
+    "if TYPE_CHECKING.*:",
+    "if _t.TYPE_CHECKING:",
+    "if t.TYPE_CHECKING:",
+    "@overload",
+    'class .*\bProtocol\b.*\):',
+    "raise NotImplementedError",
+]
+partial_branches = [
+    "pragma: no branch",
+    "if not TYPE_CHECKING:",
+    "if not _t.TYPE_CHECKING:",
+    "if not t.TYPE_CHECKING:",
+    "if .* or not TYPE_CHECKING:",
+    "if .* or not _t.TYPE_CHECKING:",
+    "if .* or not t.TYPE_CHECKING:",
+]