fix naming

tests/node_tests/fix_zero.py

@@ -0,0 +1,18 @@
+import numpy as np
+from tests.node_tests._shared import make_field
+
+
+def test_fix_zero():
+    from backend.nodes.fix_zero import FixZero
+    node = FixZero()
+    field = make_field(data=np.array([[10, 20], [30, 40]], dtype=np.float64))
+
+    result_min, = node.process(field, method="min")
+    assert result_min.data.min() == 0.0
+    assert result_min.data.max() == 30.0
+
+    result_mean, = node.process(field, method="mean")
+    assert abs(result_mean.data.mean()) < 1e-10
+
+    result_median, = node.process(field, method="median")
+    assert abs(np.median(result_median.data)) < 1e-10