gh-450: move all pytest.fixture into conftest.py

This makes them available to all tests. I need `cosmo` for use in #449.

Have also added `scope="session"` so they are only computed once when
testing rather than multiple times.

tests/conftest.py

@@ -1,7 +1,45 @@
 import numpy as np
+import numpy.typing as npt
 import pytest
 
+from cosmology import Cosmology
+
+from glass import RadialWindow
+
+
+@pytest.fixture(scope="session")
+def cosmo() -> Cosmology:
+    class MockCosmology:
+        @property
+        def omega_m(self) -> float:
+            return 0.3
+
+        def ef(self, z: npt.NDArray[np.float64]) -> npt.NDArray[np.float64]:
+            return (self.omega_m * (1 + z) ** 3 + 1 - self.omega_m) ** 0.5
+
+        def xm(
+            self,
+            z: npt.NDArray[np.float64],
+            z2: npt.NDArray[np.float64] | None = None,
+        ) -> npt.NDArray[np.float64]:
+            if z2 is None:
+                return np.array(z) * 1000
+            return (np.array(z2) - np.array(z)) * 1000
+
+    return MockCosmology()
+
 
 @pytest.fixture(scope="session")
 def rng() -> np.random.Generator:
     return np.random.default_rng(seed=42)
+
+
+@pytest.fixture(scope="session")
+def shells() -> list[RadialWindow]:
+    return [
+        RadialWindow(np.array([0.0, 1.0, 2.0]), np.array([0.0, 1.0, 0.0]), 1.0),
+        RadialWindow(np.array([1.0, 2.0, 3.0]), np.array([0.0, 1.0, 0.0]), 2.0),
+        RadialWindow(np.array([2.0, 3.0, 4.0]), np.array([0.0, 1.0, 0.0]), 3.0),
+        RadialWindow(np.array([3.0, 4.0, 5.0]), np.array([0.0, 1.0, 0.0]), 4.0),
+        RadialWindow(np.array([4.0, 5.0, 6.0]), np.array([0.0, 1.0, 0.0]), 5.0),
+    ]

tests/test_lensing.py

@@ -4,7 +4,6 @@
 
 import healpix
 import numpy as np
-import numpy.typing as npt
 import pytest
 
 from glass import (
@@ -19,39 +18,6 @@
     from cosmology import Cosmology
 
 
-@pytest.fixture
-def shells() -> list[RadialWindow]:
-    return [
-        RadialWindow(np.array([0.0, 1.0, 2.0]), np.array([0.0, 1.0, 0.0]), 1.0),
-        RadialWindow(np.array([1.0, 2.0, 3.0]), np.array([0.0, 1.0, 0.0]), 2.0),
-        RadialWindow(np.array([2.0, 3.0, 4.0]), np.array([0.0, 1.0, 0.0]), 3.0),
-        RadialWindow(np.array([3.0, 4.0, 5.0]), np.array([0.0, 1.0, 0.0]), 4.0),
-        RadialWindow(np.array([4.0, 5.0, 6.0]), np.array([0.0, 1.0, 0.0]), 5.0),
-    ]
-
-
-@pytest.fixture
-def cosmo() -> Cosmology:
-    class MockCosmology:
-        @property
-        def omega_m(self) -> float:
-            return 0.3
-
-        def ef(self, z: npt.NDArray[np.float64]) -> npt.NDArray[np.float64]:
-            return (self.omega_m * (1 + z) ** 3 + 1 - self.omega_m) ** 0.5
-
-        def xm(
-            self,
-            z: npt.NDArray[np.float64],
-            z2: npt.NDArray[np.float64] | None = None,
-        ) -> npt.NDArray[np.float64]:
-            if z2 is None:
-                return np.array(z) * 1000
-            return (np.array(z2) - np.array(z)) * 1000
-
-    return MockCosmology()
-
-
 @pytest.mark.parametrize("usecomplex", [True, False])
 def test_deflect_nsew(usecomplex: bool) -> None:  # noqa: FBT001
     d = 5.0