code:     public void testStripExpression() throws Exception {
          // given
          ValueStack stack = container.getInstance(ValueStackFactory.class).createValueStack();
          String anExpression = "%{foo}";
  
          // when
          String actual = ComponentUtils.stripExpressionIfAltSyntax(stack, anExpression);
  
          // then
          assertEquals(actual, "foo");
      }
  
  