Raise error message if low=high

Author: dafeda

src/semeio/fmudesign/design_distributions.py

@@ -321,6 +321,12 @@ def draw_values_triangular(
     high = float(dist_parameters[2])
 
     dist_scale = high - low
+
+    if dist_scale == 0:
+        raise ValueError(
+            f"Invalid triangular distribution: minimum ({low}) and maximum ({high}) cannot be equal"
+        )
+
     shape = (mode - low) / dist_scale
 
     if normalscoresamples is not None:

tests/fmudesign/test_design_distributions.py

@@ -202,6 +202,9 @@ def test_draw_values_triangular():
     assert all(isinstance(value, numbers.Number) for value in values)
     assert all(10 <= value <= 1000 for value in values)
 
+    with pytest.raises(ValueError, match="minimum .* and maximum .* cannot be equal"):
+        dists.draw_values_triangular([100, 100, 100], 10, rng)
+
 
 @pytest.mark.parametrize("seed", range(100))
 def test_draw_values_pert(seed):