add unit test to ensure esprima+recast WILL NOT fail GerHobbelt/jison#30

(which currently still uses regexes for code manipulation instead of esprima+recast AST rewriting) :: action code in grammar doesn't expand `@label` ref inside template string with comments
GerHobbelt · Nov 10, 2017 · 4166f67 · 4166f67
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diff --git a/test/fixtures/jison-actions/jison_0016.js b/test/fixtures/jison-actions/jison_0016.js
@@ -0,0 +1,11 @@
+    if ($prec) {
+        if ($handle.length === 0) {
+            yyerror(rmCommonWS`
+                You cannot specify a precedence override for an epsilon (a.k.a. empty) rule!
+
+                  Erroneous area:
+                ${yylexer.prettyPrintRange(@handle, @0 /* @handle is very probably NULL! We need this one for some decent location info! */, @action /* ditto! */)}
+            `);
+        }
+        $$.push($prec);
+    }