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Pants

Is there a way to override the `EnvironmentName` used by the rule graph in a test? I tried setting up the RuleRunner with:
```            QueryRule(ProcessResult, [Process, EnvironmentName]),
            QueryRule(FallibleProcessResult, [Process, EnvironmentName]),```
and then call `rule_runner.request(FallibleProcessResult, [process, env_name])`
but I get this error:
```E       Exception: Values used as `Params` must have distinct types, but the following values had the same type (`EnvironmentName`):
E         EnvironmentName(val='__local_workspace__')
E         EnvironmentName(val=None)```

I would have hoped the `EnvironmentName` from the `rule_runner.request` call would have overridden whatever was already generated within the rule graph.

Can't set it when creating the rule runner?
<https://github.com/pantsbuild/pants/blob/deb3014b23da8920a65be50239edecf744b55226/src/python/pants/testutil/rule_runner.py#L261>

I wasn't even aware of that parameter. Will try it!