I’m working on writing distribution tests for the ordered logistic distribution, but all of the other tests have scalar input parameters, for example, `normal_test.hpp`

:

```
vector<double> param(3);
param[0] = 0; // y
param[1] = 0; // mu
param[2] = 1; // sigma
parameters.push_back(param);
log_prob.push_back(-0.918938533204672669541); // expected log_prob
```

Whereas I need `param[3]`

to be a vector of doubles.

Is there a different way that I should be parameterising this?