There are no tests asserting that `Error parsing arguments [...]` is part of 
the error message.

Imo the test `testIllegalArgs` should be rewritten as follows:

```
        @Test
        public void testThrowExceptionIfParameterIsNotPrefixed() {
                exception.expect(IllegalArgumentException.class);
                exception.expectMessage("Error parsing arguments '[a]' on 'a'. 
Please prefix keys with -- or -.");

                ParameterTool.fromArgs(new String[]{"a"});
        }
```

[ Full content available at: https://github.com/apache/flink/pull/6737 ]
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