Test coverage bug.

.coveragerc

@@ -8,6 +8,9 @@ omit =
     # Don't care about STRUPHY code.
     */hylife/*
 
+    # Omit weird inclusion of numba-generated code.
+    */__numba_array_expr_synthetic_module_/*
+
 [report]
 # Regexes for lines to exclude from consideration
 exclude_lines =
@@ -31,4 +34,4 @@ exclude_lines =
     import
 
 # Ignore spontaneous `No source for code` errors:
-ignore_errors = True
+# ignore_errors = True

src/gvec_to_python/writer/paraview/vtk_writer.py

@@ -84,7 +84,4 @@ class vtkWriter():
         writer.SetFileName(filepath)
         success = writer.Write()
 
-        if success == 1:
-            return True
-        else:
-            return False
+        return success == 1