move Dummy coil sets to conftest

tests/conftest.py

@@ -9,7 +9,17 @@
 from netCDF4 import Dataset
 
 from desc.__main__ import main
+from desc.coils import (
+    CoilSet,
+    FourierPlanarCoil,
+    FourierRZCoil,
+    FourierXYZCoil,
+    MixedCoilSet,
+)
+from desc.compute import rpz2xyz_vec
 from desc.equilibrium import EquilibriaFamily, Equilibrium
+from desc.examples import get
+from desc.grid import LinearGrid
 from desc.vmec import VMECIO
 
 
@@ -217,6 +227,67 @@ def DummyStellarator(tmpdir_factory):
     return DummyStellarator_out
 
 
+@pytest.fixture(scope="session")
+def DummyCoilSet(tmpdir_factory):
+    """Create and save a dummy coil set for testing."""
+    output_dir = tmpdir_factory.mktemp("result")
+    output_path_sym = output_dir.join("DummyCoilSet_sym.h5")
+    output_path_asym = output_dir.join("DummyCoilSet_asym.h5")
+
+    eq = get("precise_QH")
+    minor_radius = eq.compute("a")["a"]
+
+    # CoilSet with symmetry
+    num_coils = 3  # number of unique coils per half field period
+    grid = LinearGrid(rho=[0.0], M=0, zeta=2 * num_coils, NFP=eq.NFP * (eq.sym + 1))
+    with pytest.warns(UserWarning):  # because eq.NFP != grid.NFP
+        data_center = eq.axis.compute("x", grid=grid, basis="xyz")
+        data_normal = eq.compute("e^zeta", grid=grid)
+    centers = data_center["x"]
+    normals = rpz2xyz_vec(data_normal["e^zeta"], phi=grid.nodes[:, 2])
+    coils = []
+    for k in range(1, 2 * num_coils + 1, 2):
+        coil = FourierPlanarCoil(
+            current=1e6,
+            center=centers[k, :],
+            normal=normals[k, :],
+            r_n=[0, minor_radius + 0.5, 0],
+        )
+        coils.append(coil)
+    coilset_sym = CoilSet(coils, NFP=eq.NFP, sym=eq.sym)
+    coilset_sym.save(output_path_sym)
+
+    # equivalent CoilSet without symmetry
+    coilset_asym = CoilSet.from_symmetry(coilset_sym, NFP=eq.NFP, sym=eq.sym)
+    coilset_asym.save(output_path_asym)
+
+    DummyCoilSet_out = {
+        "output_path_sym": output_path_sym,
+        "output_path_asym": output_path_asym,
+    }
+    return DummyCoilSet_out
+
+
+@pytest.fixture(scope="session")
+def DummyMixedCoilSet(tmpdir_factory):
+    """Create and save a dummy mixed coil set for testing."""
+    output_dir = tmpdir_factory.mktemp("result")
+    output_path = output_dir.join("DummyMixedCoilSet.h5")
+
+    tf_coil = FourierPlanarCoil(center=[2, 0, 0], normal=[0, 1, 0], r_n=[1])
+    tf_coilset = CoilSet.linspaced_angular(tf_coil, n=4)
+    vf_coil = FourierRZCoil(R_n=3, Z_n=-1)
+    vf_coilset = CoilSet.linspaced_linear(
+        vf_coil, displacement=[0, 0, 2], n=3, endpoint=True
+    )
+    xyz_coil = FourierXYZCoil()
+    full_coilset = MixedCoilSet((tf_coilset, vf_coilset, xyz_coil))
+
+    full_coilset.save(output_path)
+    DummyMixedCoilSet_out = {"output_path": output_path}
+    return DummyMixedCoilSet_out
+
+
 @pytest.fixture(scope="session")
 def writer_test_file(tmpdir_factory):
     """Create temporary output directory."""

tests/test_coils.py

@@ -17,7 +17,6 @@
 from desc.examples import get
 from desc.geometry import FourierRZCurve, FourierRZToroidalSurface
 from desc.grid import LinearGrid
-from desc.io import load
 from desc.magnetic_fields import SumMagneticField, VerticalMagneticField
 
 
@@ -916,28 +915,6 @@ def test_save_makegrid_coils_assert_NFP(tmpdir_factory):
         coilset.save_in_makegrid_format(str(path), NFP=3)
 
 
-@pytest.mark.unit
-def test_save_h5_for_mixed_coilset(tmpdir_factory):
-    """Test saving MixedCoilSet containing coilsets and a coil."""
-    # tests fix in PR #1016
-    output_dir = tmpdir_factory.mktemp("coilset_save")
-    output_path = output_dir.join("DummyMixedCoilSet.h5")
-
-    tf_coil = FourierPlanarCoil(current=20, center=[2, 0, 0], normal=[0, 1, 0], r_n=[1])
-    tf_coilset = CoilSet.linspaced_angular(tf_coil, n=4)
-    vf_coil = FourierRZCoil(current=100, R_n=3, Z_n=-1)
-    vf_coilset = CoilSet.linspaced_linear(
-        vf_coil, displacement=[0, 0, 2], n=3, endpoint=True
-    )
-    xyz_coil = FourierXYZCoil()
-    full_coilset = MixedCoilSet((tf_coilset, vf_coilset, xyz_coil))
-
-    full_coilset.save(output_path)
-    coils = load(output_path)
-
-    assert coils.equiv(full_coilset)
-
-
 @pytest.mark.unit
 def test_load_makegrid_coils_header_asserts(tmpdir_factory):
     """Test loading in CoilSets from incorrect MAKEGRID format files throws error."""