low pri features

tests/node_tests/hough_transform.py

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+import numpy as np
+import pytest
+from tests.node_tests._shared import make_field
+
+
+def test_hough_lines_basic():
+    from backend.nodes.hough_transform import HoughTransform
+
+    node = HoughTransform()
+    # Create a field with a horizontal line
+    data = np.zeros((64, 64))
+    data[32, :] = 1.0
+    field = make_field(data=data)
+    accum, records = node.process(field, "lines", 3, 1.0, 10, 30)
+    assert accum.data.ndim == 2
+    assert isinstance(records, list)
+
+
+def test_hough_circles_basic():
+    from backend.nodes.hough_transform import HoughTransform
+
+    node = HoughTransform()
+    # Create a field with a circle
+    data = np.zeros((64, 64))
+    yy, xx = np.ogrid[:64, :64]
+    r2 = (yy - 32)**2 + (xx - 32)**2
+    data[(r2 > 144) & (r2 < 196)] = 1.0  # ring at radius ~13
+    field = make_field(data=data)
+    accum, records = node.process(field, "circles", 3, 1.0, 8, 20)
+    assert accum.data.shape == (64, 64)
+    assert isinstance(records, list)
+
+
+def test_hough_preserves_output_types():
+    from backend.nodes.hough_transform import HoughTransform
+
+    node = HoughTransform()
+    field = make_field(shape=(32, 32))
+    accum, records = node.process(field, "lines", 2, 1.0, 5, 15)
+    assert hasattr(accum, 'data')
+    assert isinstance(records, list)
+
+
+def test_hough_unknown_mode():
+    from backend.nodes.hough_transform import HoughTransform
+
+    node = HoughTransform()
+    field = make_field(shape=(32, 32))
+    with pytest.raises(ValueError):
+        node.process(field, "unknown", 1, 1.0, 5, 15)