add usage integration test

Author: Cudok

bim2sim/plugins/PluginIFCCheck/test/integration/test_usage.py

@@ -0,0 +1,18 @@
+import unittest
+
+
+class TestUsage(unittest.TestCase):
+    """Tests for general use of library"""
+
+    def test_import_plugin(self):
+        """Test importing IFCCheck plugin in python script"""
+        try:
+            from bim2sim.plugins import load_plugin, Plugin
+            plugin = load_plugin('bim2sim_ifccheck')
+            assert issubclass(plugin, Plugin)
+        except ImportError as err:
+            self.fail("Unable to import plugin\nreason: %s"%(err))
+
+
+if __name__ == '__main__':
+    unittest.main()