refactor: move pytest.ini and top-level conftest.py to lib/spack/spack/test

- removes two files from root of repository
- `spack test` still works fine to run tests

lib/spack/spack/cmd/test.py

@@ -97,7 +97,7 @@ def test(parser, args, unknown_args):
         return
 
     # pytest.ini lives in the root of the spack repository.
-    with working_dir(spack.paths.prefix):
+    with working_dir(spack.paths.test_path):
         # --list and --long-list print the test output better.
         if args.list or args.long_list:
             do_list(args, unknown_args)

lib/spack/spack/test/conftest.py

@@ -53,6 +53,32 @@
 from spack.version import Version
 
 
+# Hooks to add command line options or set other custom behaviors.
+# They must be placed here to be found by pytest. See:
+#
+# https://docs.pytest.org/en/latest/writing_plugins.html
+#
+def pytest_addoption(parser):
+    group = parser.getgroup("Spack specific command line options")
+    group.addoption(
+        '--fast', action='store_true', default=False,
+        help='runs only "fast" unit tests, instead of the whole suite')
+
+
+def pytest_collection_modifyitems(config, items):
+    if not config.getoption('--fast'):
+        # --fast not given, run all the tests
+        return
+
+    slow_tests = ['db', 'network', 'maybeslow']
+    skip_as_slow = pytest.mark.skip(
+        reason='skipped slow test [--fast command line option given]'
+    )
+    for item in items:
+        if any(x in item.keywords for x in slow_tests):
+            item.add_marker(skip_as_slow)
+
+
 #
 # These fixtures are applied to all tests
 #

lib/spack/spack/test/pytest.ini

@@ -0,0 +1,9 @@
+# content of pytest.ini
+[pytest]
+addopts = --durations=20 -ra
+testpaths = .
+python_files = *.py
+markers =
+  db: tests that require creating a DB
+  network: tests that require access to the network
+  maybeslow: tests that may be slow (e.g. access a lot the filesystem, etc.)