Add test to reproduce linewrap error

pydy/tests/test_utils.py

@@ -4,7 +4,11 @@
 from setuptools import __version__ as SETUPTOOLS_VERSION
 from nose.tools import assert_raises
 
+from sympy import cos, sin, tan, sqrt, Matrix
+from sympy.physics.mechanics import dynamicsymbols
+
 from ..utils import sympy_equal_to_or_newer_than
+from ..codegen.cython_code import CythonMatrixGenerator
 
 
 def test_sympy_equal_to_or_newer_than():
@@ -18,3 +22,17 @@ def test_sympy_equal_to_or_newer_than():
     if parse_version(SETUPTOOLS_VERSION) >= parse_version('8.0'):
         with assert_raises(ValueError):
             sympy_equal_to_or_newer_than('0.7.7', '0.7.6-git')
+
+def test_codegen_linewrap():
+
+    # Generated can result in long expressions with no obvious place to insert a
+    # newline. Refer to https://github.com/pydy/pydy/issues/263.
+    x, y, z = dynamicsymbols('x y z')
+    expr = (x*y*z*cos(x)*sin(x)*tan(x)*sqrt(x)*cos(y)*sin(y)*tan(y)*
+            sqrt(y)*cos(z)*sin(z)*tan(z)*sqrt(z)*cos(x*y)*sin(x*y)*tan(x*y)*
+            sqrt(x*y)* cos(y*z)*sin(y*z)*tan(y*z)*sqrt(y*z)*cos(z*x)*
+            sin(z*x)*tan(z*x)*sqrt(z*x)*3)/8
+    mat_expr = Matrix([expr])
+
+    q = [x, y, z]
+    gen = CythonMatrixGenerator([q], [mat_expr])