[jboss-jira] [JBoss JIRA] (DROOLS-4636) Update Scenario Cheatsheet to mention MVEL

[Anna Dupliak (Jira)]

Anna Dupliak created DROOLS-4636:
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             Summary: Update Scenario Cheatsheet to mention MVEL
                 Key: DROOLS-4636
                 URL: https://issues.jboss.org/browse/DROOLS-4636
             Project: Drools
          Issue Type: Task
          Components: Scenario Simulation and Testing
    Affects Versions: 7.27.0.Final
            Reporter: Anna Dupliak
            Assignee: Daniele Zonca


Update Scenario Cheatsheet for MVEL expression usage.
Here are some topics that could be mentioned:

Expressions for Rule based scenarios for simple types
Starts from "#"
Runs for properties
Runs for duplicated properties
Returns the same type as property type in GIVEN
Returns boolean in EXPECTED
Receives rule processed value as a parameter in EXPECTED via keyword "actualValue"
Applies java.util.Objects.equals(actualValue, expression result) on the expression result if the EXPECTED value not a boolean
Could run any of java function for the project
Exports and imports as any other value


Limitation for GIVEN
1. Mvel expression results not property same type - drives scenario failure, error reason and highlighted
Use case:
User inputs 1/2 to Integer property
2.Mvel execution throws exception - drives scenario execution stopping, failure, error alert
Use case:
User inputs inexistent MVEL function  in one of the properties
3.Mvel expression exception stops expression execution for all EXPECT colons
Use case:
User got one of the GIVEN fact expression excepted 
4.It cannot be mixed with simple expressions in one cell
Use case:
For cell inputs :
[#4+4,68]
#actualvalue>1



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