adding more nodes

tests/node_tests/flatten_base.py

@@ -0,0 +1,38 @@
+import numpy as np
+import pytest
+from tests.node_tests._shared import make_field
+
+
+def test_flatten_base_removes_tilt():
+    from backend.nodes.flatten_base import FlattenBase
+
+    node = FlattenBase()
+    yy, xx = np.mgrid[:64, :64]
+    base_tilt = 0.01 * xx + 0.02 * yy
+    # Add some tall features
+    data = base_tilt.copy()
+    data[20:30, 20:30] += 10.0
+    field = make_field(data=data)
+    result, = node.process(field, 30.0, 1)
+    assert result.data.shape == (64, 64)
+    # Features should remain raised, base should be flatter
+    assert result.data[25, 25] > result.data[0, 0]
+
+
+def test_flatten_base_preserves_shape():
+    from backend.nodes.flatten_base import FlattenBase
+
+    node = FlattenBase()
+    field = make_field(shape=(48, 64))
+    result, = node.process(field, 30.0, 2)
+    assert result.data.shape == (48, 64)
+
+
+def test_flatten_base_flat_surface():
+    from backend.nodes.flatten_base import FlattenBase
+
+    node = FlattenBase()
+    field = make_field(data=np.ones((32, 32)) * 5.0)
+    result, = node.process(field, 50.0, 0)
+    # All pixels are the same, subtracting mean gives zero
+    assert np.allclose(result.data, 0.0, atol=1e-10)