test that there can only exist one instance of EQSN

Author: benjione

tests/test_multiple_instances_eqsn.py

@@ -0,0 +1,27 @@
+from eqsn import EQSN
+import time
+
+
+def test_get_instance():
+    print("test get instance...")
+    i1 = EQSN.get_instance()
+    i2 = EQSN.get_instance()
+    assert i1 == i2
+    i1.stop_all()
+    print("Test succesfull")
+
+
+def test_error_at_creating_EQSN_twice():
+    error = False
+    try:
+        _ = EQSN()
+        _ = EQSN()
+    except:
+        error = True
+    assert error
+
+
+if __name__ == "__main__":
+    test_get_instance()
+    time.sleep(0.1)
+    test_error_at_creating_EQSN_twice()