Revize da0fc952

Added a global error handler for CryptographyException errors.
Added a dependency ony pytest-mock library in order to be able to mock method calls in tests.
Covered the added global CryptographyException error handler in a test.

src/services/cryptography.py

@@ -520 +520 @@
 
     def __str__(self):
         # TODO check log is valid here
+        # TODO Standa does not think so...
         msg = f"""
         EXECUTABLE: {self.executable}
         ARGS: {self.args}