Add tests for potential deadlocks

The tests are based on #61

Author: sjoelund

OMPython/__init__.py

@@ -1265,8 +1265,7 @@ def simulate(self):  # 11
                 resultfilename = self.modelName + '_res.mat'
                 return
             else:
-                print("Error: application file not generated yet")
-                return
+                raise Exception("Error: application file not generated yet")
         else:
             if (platform.system() == "Windows"):
                 getExeFile = os.path.join(os.getcwd(), '{}.{}'.format(self.modelName, "exe")).replace("\\", "/")
@@ -1292,7 +1291,7 @@ def simulate(self):  # 11
                 resultfilename = self.modelName + '_res.mat'
                 return
             else:
-                print("Error: application file not generated yet")
+                raise Exception("Error: application file not generated yet")
 
     # to extract simulation results
     def getSolutions(self, *varList):  # 12

tests/__init__.py

@@ -1 +1 @@
-__all__ = ['tests.test_OMParser', 'tests.test_ZMQ']
+__all__ = ['tests.test_OMParser', 'tests.test_ZMQ', 'tests.test_ModelicaSystem']

tests/test_ModelicaSystem.py

@@ -0,0 +1,28 @@
+import OMPython
+import unittest
+import tempfile, shutil, os
+
+class ModelicaSystemTester(unittest.TestCase):
+  def __init__(self, *args, **kwargs):
+    super(ModelicaSystemTester, self).__init__(*args, **kwargs)
+    self.tmp = tempfile.mkdtemp(prefix='tmpOMPython.tests')
+    with open("%s/M.mo" % self.tmp, "w") as fout:
+      fout.write("""model M
+  Real r = time;
+end M;
+""")
+  def __del__(self):
+    shutil.rmtree(self.tmp, ignore_errors=True)
+
+  def testModelicaSystemLoop(self):
+    def worker():
+      origDir = os.getcwd()
+      os.chdir(self.tmp)
+      m = OMPython.ModelicaSystem("M.mo", "M")
+      m.simulate()
+      os.chdir(origDir)
+    for _ in range(10):
+      worker()
+
+if __name__ == '__main__':
+    unittest.main()