Add simple test for main

test_app.py

@@ -0,0 +1,11 @@
+from app import predict
+import wikipedia
+wikipedia.set_lang("it")
+import warnings
+warnings.filterwarnings("ignore")
+
+
+def test_predict():
+    text = wikipedia.summary('Sardegna', sentences=10)
+    summary = predict(text)
+    assert len(text) > len(summary)