`asr` should generate assertRaises snippets with callable's argument placeholders.

currently,  `asr` generate :

```
self.assertRaises(exception, callable)
```

instead of:

```
self.assertRaises(exception, callable, inputdata)
# inputdata is the arguments for the callsble
```

I think the placeholder of callable's argument  should be added, though sometimes we test some function that need no argument(s).
