You changed the behavior by changing the error message. It would now be
something like this:
```
Error parsing arguments '[--a, -b, --]' on '--'. Keys should never be empty"
```
However, previously the message would have been:
```
The input [--a, -b, --] contains an empty argument
```
The message `Error parsing arguments '[--a, -b, --]' on '--'.` does not add any
information. I would revert to the old message. Then you also do not need the
extra variable `errorMessage`.
I would also rewrite the tests `testEmptyVal` and `testEmptyValShort` in the
following way:
```
@Test
public void testEmptyVal() {
exception.expect(IllegalArgumentException.class);
exception.expectMessage("The input [--a, -b, --] contains an
empty argument");
ParameterTool.fromArgs(new String[]{"--a", "-b", "--"});
}
@Test
public void testEmptyValShort() {
exception.expect(IllegalArgumentException.class);
exception.expectMessage("The input [--a, -b, -] contains an
empty argument");
ParameterTool.fromArgs(new String[]{"--a", "-b", "-"});
}
```
This way we assert that the exception message is correct.
[ Full content available at: https://github.com/apache/flink/pull/6737 ]
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