adding more nodes

tests/node_tests/poly_distort.py

@@ -0,0 +1,34 @@
+import numpy as np
+import pytest
+from tests.node_tests._shared import make_field
+
+
+def test_zero_coefficients():
+    """All coefficients zero should return output approximately equal to input."""
+    from backend.nodes.poly_distort import PolynomialDistortion
+
+    node = PolynomialDistortion()
+    field = make_field(shape=(64, 64))
+    result, = node.process(field, k1_x=0.0, k1_y=0.0, k2_x=0.0, k2_y=0.0, k3_x=0.0, k3_y=0.0)
+    assert np.allclose(result.data, field.data, atol=1e-10)
+
+
+def test_nonzero_distortion():
+    """Non-zero k1_x should preserve shape but change values."""
+    from backend.nodes.poly_distort import PolynomialDistortion
+
+    node = PolynomialDistortion()
+    field = make_field(shape=(64, 64))
+    result, = node.process(field, k1_x=0.1, k1_y=0.0, k2_x=0.0, k2_y=0.0, k3_x=0.0, k3_y=0.0)
+    assert result.data.shape == field.data.shape
+    assert not np.allclose(result.data, field.data)
+
+
+def test_shape_preserved():
+    """Output shape must equal input shape."""
+    from backend.nodes.poly_distort import PolynomialDistortion
+
+    node = PolynomialDistortion()
+    field = make_field(shape=(32, 48))
+    result, = node.process(field, k1_x=0.05, k1_y=0.05, k2_x=0.01, k2_y=0.01, k3_x=0.0, k3_y=0.0)
+    assert result.data.shape == (32, 48)