new ExpressionContextMock("expressionContext", expectations);
environmentContext.expects.getExpressionContext().
returns(expressionContext);
DefaultNamespacePrefixTracker tracker =
new DefaultNamespacePrefixTracker();
tracker.startPrefixMapping("mcs",
XDIMESchemata.XDIME2_MCS_NAMESPACE);
expressionContext.expects.getNamespacePrefixTracker().returns(tracker);
return environmentContext;