autouse fork/spawn fixture so we test both

this is necessary for getting compatibility with windows and macos

tests/conftest.py

@@ -0,0 +1,28 @@
+import multiprocessing as mp
+import os
+import yaml
+
+from dacapo.options import Options
+
+import pytest
+
+
+@pytest.fixture(params=["fork", "spawn"], autouse=True)
+def context(monkeypatch):
+    ctx = mp.get_context("spawn")
+    monkeypatch.setattr(mp, "Queue", ctx.Queue)
+    monkeypatch.setattr(mp, "Process", ctx.Process)
+    monkeypatch.setattr(mp, "Event", ctx.Event)
+    monkeypatch.setattr(mp, "Value", ctx.Value)
+
+
+@pytest.fixture(autouse=True)
+def runs_base_dir(tmpdir):
+    options_file = tmpdir / "dacapo.yaml"
+    os.environ["DACAPO_OPTIONS_FILE"] = f"{options_file}"
+
+    with open(options_file, "w") as f:
+        options_file.write(yaml.safe_dump({"runs_base_dir": f"{tmpdir}"}))
+
+    assert Options.config_file() == options_file
+    assert Options.instance().runs_base_dir == tmpdir