Add tests for expr.DocsExpr.EvalName() and expr.ContactExpr.EvalName() (#2012)
Add tests for expr.DocsExpr.EvalName() and expr.ContactExpr.EvalName() (#2012)

* Adding tests for EvalName for ContactExpr and DocsExpr

* Final draft of tests

* Adding suggested changes

* Adding more test cases"

goadesign/goa,raphael/goa