adding more nodes

tests/node_tests/scan_line_reorder.py

@@ -0,0 +1,54 @@
+import numpy as np
+import pytest
+from tests.node_tests._shared import make_field
+
+
+def test_reverse_odd_fixes_meander():
+    from backend.nodes.scan_line_reorder import ScanLineReorder
+
+    node = ScanLineReorder()
+    data = np.arange(32 * 32, dtype=np.float64).reshape(32, 32)
+    # Simulate meander: reverse odd rows
+    meander = data.copy()
+    meander[1::2, :] = meander[1::2, ::-1]
+    field = make_field(data=meander)
+    result, = node.process(field, "reverse_odd")
+    # Should restore original order
+    assert np.allclose(result.data, data)
+
+
+def test_reverse_even():
+    from backend.nodes.scan_line_reorder import ScanLineReorder
+
+    node = ScanLineReorder()
+    field = make_field(shape=(32, 32))
+    result, = node.process(field, "reverse_even")
+    assert result.data.shape == (32, 32)
+
+
+def test_deinterlace_odd():
+    from backend.nodes.scan_line_reorder import ScanLineReorder
+
+    node = ScanLineReorder()
+    field = make_field(shape=(32, 32))
+    result, = node.process(field, "deinterlace_odd")
+    assert result.data.shape[1] == 32
+
+
+def test_flip_vertical():
+    from backend.nodes.scan_line_reorder import ScanLineReorder
+
+    node = ScanLineReorder()
+    data = np.arange(16 * 16, dtype=np.float64).reshape(16, 16)
+    field = make_field(data=data)
+    result, = node.process(field, "flip_vertical")
+    assert np.array_equal(result.data, data[::-1, :])
+
+
+def test_unknown_operation():
+    from backend.nodes.scan_line_reorder import ScanLineReorder
+
+    node = ScanLineReorder()
+    field = make_field(shape=(16, 16))
+    with pytest.raises(ValueError):
+        node.process(field, "unknown")