https://issues.jboss.org/browse/EAP7-275 is adding ability to CLI to show the real value of expression properties in addition to the expression

This test serves as basic smoke tests to be run within the testsuite.
RealValueExpressionTestCase:

• creates new system property "real.value.expression.test.case" with value in this format: ${oldSystemProperty:defaultValue}
• test "read-resource" and "read-attribute" operations, these operations should work correctly with resolve-expressions parametr
• remove newly created system property