Add runtime error tests

Author: robbievanleeuwen

sectionproperties/tests/test_stress.py

@@ -0,0 +1,46 @@
+import pytest
+import sectionproperties.pre.library.primitive_sections as primitive_sections
+from sectionproperties.analysis.section import Section
+
+# define geometry
+rect = primitive_sections.rectangular_section(b=50, d=100)
+rect.create_mesh(mesh_sizes=0)  # coarse mesh
+sec = Section(rect)
+
+
+# test stress runtime errors
+def test_stress_runtime_errors():
+    # check runtime error with no analysis performed
+    with pytest.raises(RuntimeError):
+        sec.calculate_stress()
+
+    sec.calculate_geometric_properties()
+
+    # check runtime errors with shear/torsion applied, no warping analysis
+    with pytest.raises(RuntimeError):
+        sec.calculate_stress(Vx=1)
+
+    with pytest.raises(RuntimeError):
+        sec.calculate_stress(Vy=1)
+
+    with pytest.raises(RuntimeError):
+        sec.calculate_stress(Mzz=1)
+
+    # check no runtime errors with no shear/torsion applied
+    sec.calculate_stress(N=1)
+    sec.calculate_stress(Mxx=1)
+    sec.calculate_stress(Myy=1)
+    sec.calculate_stress(M11=1)
+    sec.calculate_stress(M22=1)
+
+    sec.calculate_warping_properties()
+
+    # check no runtime errors after warping analysis
+    sec.calculate_stress(N=1)
+    sec.calculate_stress(Mxx=1)
+    sec.calculate_stress(Myy=1)
+    sec.calculate_stress(M11=1)
+    sec.calculate_stress(M22=1)
+    sec.calculate_stress(Vx=1)
+    sec.calculate_stress(Vy=1)
+    sec.calculate_stress(Mzz=1)