Move pytest options to pyproject.toml (#1279)

In addition to being the more modern approach, this lets us start to
consolidate tool options into a single well-known location, and also
lets us simplify the check scripts.

One of the PRs that will resolve
#1268.

Author: mhucka

CONTRIBUTING.md

@@ -280,7 +280,7 @@ We use [pytest](https://docs.pytest.org) to run our tests and
 [pytest-cov](https://pytest-cov.readthedocs.io) to compute coverage.
 
 *   While developing, periodically check that changes do not break anything. For fast checks, use
-    `pytest -c dev_tools/conf/pytest.ini PATH`, where `PATH` is a directory or pytest file to test.
+    `pytest -m "not slow" PATH`, where `PATH` is a directory or pytest file to test.
 
 *   After finishing a task, run `check/pytest` to test all of the OpenFermion code.
 

check/pytest

@@ -43,11 +43,10 @@ for arg in "$@"; do
 done
 
 if [ -z "${ACTUALLY_QUIET}" ]; then
-    pytest -c dev_tools/conf/pytest.ini --rootdir="$rootdir" "${PYTEST_ARGS[@]}"
+    pytest --rootdir="$rootdir" "${PYTEST_ARGS[@]}"
 else
     # Filter out lines like "...F....x...      [ 42%]", with coloring.
-    pytest -c dev_tools/conf/pytest.ini \
-           --rootdir="$rootdir" -q --color=yes "${PYTEST_ARGS[@]}" | \
+    pytest --rootdir="$rootdir" -q --color=yes "${PYTEST_ARGS[@]}" | \
         grep -Ev '^(\x1B\[0m)?[\.FEsx]+(\x1B\[36m)?[[:space:]]+\[[[:space:]]*[0-9]+%\](\x1B\[0m)?$'
     exit "${PIPESTATUS[0]}"
 fi

dev_tools/conf/pytest.ini

@@ -23,17 +23,16 @@ skip-magic-trailing-comma = true
 core = "sysmon"
 disable_warnings = ["no-sysmon"]
 
-# Omit files outside the current working directory.
-# Note: this means coverage must be run from the openfermion repo root.
-# Failure to do so will result in false positives.
-omit = [
-    "./profiling/performance_benchmarks.py",
-    "./dev_tools/*",
+[tool.pytest.ini_options]
+markers = [
+    """slow: marks tests as slow (deselect with '-m "not slow"')""",
+]
+filterwarnings = [
+    "ignore:Skipped assert_qasm_is_consistent_with_unitary because qiskit.*:UserWarning",
 ]
 
 [tool.mypy]
 implicit_optional = true
-
 # TODO: this is temporary for 1.7.0 release. Remove this & fix the errors.
 ignore_errors = true