synthetic surface and spm specific features

tests/node_tests/mfm_domains.py

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+import numpy as np
+import pytest
+from tests.node_tests._shared import make_field
+
+
+def test_output_shapes():
+    from backend.nodes.mfm_domains import MFMDomainGeneration
+
+    node = MFMDomainGeneration()
+    field = make_field(shape=(48, 64))
+
+    hz, dhz_dz = node.process(
+        field,
+        height=50e-9,
+        thickness=20e-9,
+        magnetization=1e6,
+        stripe_width_a=200e-9,
+        stripe_width_b=200e-9,
+        gap=0.0,
+    )
+    assert hz.data.shape == (48, 64)
+    assert dhz_dz.data.shape == (48, 64)
+
+
+def test_finite_values():
+    from backend.nodes.mfm_domains import MFMDomainGeneration
+
+    node = MFMDomainGeneration()
+    field = make_field(shape=(32, 32))
+
+    hz, dhz_dz = node.process(
+        field,
+        height=50e-9,
+        thickness=20e-9,
+        magnetization=1e6,
+        stripe_width_a=200e-9,
+        stripe_width_b=200e-9,
+        gap=0.0,
+    )
+    assert np.isfinite(hz.data).all()
+    assert np.isfinite(dhz_dz.data).all()
+
+
+def test_uniform_along_y():
+    """Stripes run along y, so every row of the output should be identical."""
+    from backend.nodes.mfm_domains import MFMDomainGeneration
+
+    node = MFMDomainGeneration()
+    field = make_field(shape=(64, 64))
+
+    hz, dhz_dz = node.process(
+        field,
+        height=50e-9,
+        thickness=20e-9,
+        magnetization=1e6,
+        stripe_width_a=200e-9,
+        stripe_width_b=200e-9,
+        gap=0.0,
+    )
+    assert np.allclose(hz.data[0], hz.data[hz.data.shape[0] // 2])
+    assert np.allclose(dhz_dz.data[0], dhz_dz.data[dhz_dz.data.shape[0] // 2])
+
+
+def test_units():
+    from backend.nodes.mfm_domains import MFMDomainGeneration
+
+    node = MFMDomainGeneration()
+    field = make_field(shape=(32, 32))
+
+    hz, dhz_dz = node.process(
+        field,
+        height=50e-9,
+        thickness=20e-9,
+        magnetization=1e6,
+        stripe_width_a=200e-9,
+        stripe_width_b=200e-9,
+        gap=0.0,
+    )
+    assert hz.si_unit_z == "A/m"
+    assert dhz_dz.si_unit_z == "A/m²"