Join us on our second virtual meetup to learn more about the capabilities of the MUnit Framework in Mule 4: mocking, spying, recording test cases, and more! We'll also go through some Intermediate DW 2.0 functions, like concatenation using ++, {( )}, and $( ) and how to use the null checkers default, if/else, or if.

1. July 15, 2020: Toronto Virtual Meetup #2
TORONTO

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Agenda
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• Introductions
• Presentations
– Intermediate DW 2.0
– MUnit Framework in Mule 4
• What’s next

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Introductions
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• About the organizers:
– Alexandra Martinez
– Mahesh Pujari
– Pravallika Nagaraja
– Kishore Reddy
A SHOW OF HANDS:
Who is new to this MeetUp?

4. Alexandra Martinez
Intermediate DW 2.0

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• DW Playground
• Using application/dw as output
• Calling functions
• Concatenation
– ++ overview
– ++ with objects
– Object concatenation using {()}
– String concatenation using $()
• Null checkers
– Default
– If/else
– If
Content

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• DockerHub: https://hub.docker.com/r/machaval/dw-playground
DW Playground (2.x and 1.x)

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• https://dwl.mule.club/
DW 2.0 Playground

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• Internal data structure used by DW
• Capable of outputting DW functions’ definitions.
– Number of arguments and their data types
– Output (if available)
Output application/dw
Note: Do NOT deploy your app with this output.
Performance may be affected.

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• Functions with 2 arguments:
– Function(arg0, arg1)
– Arg0 function arg1
Calling functions

10. Concatenation
++
{()}
$()

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++
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• Concatenates two objects and returns one flattened object.
++ with objects

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• Using parentheses
Another way…

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• When there are ( ) inside { }, it becomes a destructor:
– Destroy arrays containing objects
– Destroy an object into pairs of keys and values
• The outer { } are there to construct a new object from these keys and values
Why?

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• Evaluates expression inside $( )
• Must be casted into a string after evaluating
String concatenation using $( )

16. Null checkers
Default
If/else
If

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• Handle expression when it can be null
• Prevent DW errors
Null checkers

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• If expression returns a null, set the default values.
Null checkers - default

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• If (expression) … else …
Null checkers – if/else

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• (key: value) if (expression)
Null checkers – if

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• https://docs.mulesoft.com/mule-runtime/4.3/dw-core-functions-
plusplus
• https://docs.mulesoft.com/mule-runtime/4.3/dataweave-cookbook-
defaults
References

22. Nageshwar Rao
Daluvai
• Senior Integration Engineer
• Over 14 years of experience
• MuleSoft Certified
Developer - Level 1 (Mule 4)
• MCD - API Design Associate

23. MUnit
• Purpose
• Creation
• Project -> New -> Munit Test
• Mule Configuration file ->flow -> Munit -> Create blank
test for this flow
• Mule Configuration file -> flow -> Munit -> Record test for
this flow
• APIKit router -> Create Test Suite
• Select Create Test Suite for Project From API Specification.
• Execution
• Manual execution in Anypoint studio
• Automatic execution of CICD process
• Munit Coverage Reports
• Munit Coverage -> Generate Report

24. MUnit Scopes
• Behavior
• Execution
• validation

25. MUnit Modules
• Modules
• Munit
• Munit Tools
• MUnit Utils
• Database Server
• FTP Server

26. MUnit Module
• Scopes and Routers
• before suite
• after suite
• before test
• after test
• Test
• Operations
• set event
• set null payload

27. MUnit Tools
• Operations
• assert that
• assert equal
• assert expression
• Mock when
• verify call
• Fail
• queue
• dequeue
• store
• retrieve
• remove
• clear stored data
• store oauth token
• run custom
• Sleep
• Scopes and Routers
• Spy

28. MUnit Utils: Database Server
• Execute
• Execute query
• Validate that

29. MUnit Utils: Munit FTP Server
• Contains files
• Remove

30. Coverage Report
• Coverage %
• requiredApplicationCoverage 75
• requiredResourceCoverage 50
• requiredFlowCoverage 50
• Coverage Report Types
• Console
• Html
• json

31. Demo 1

32. Demo 2 – Munit Test Recorder

33. Quiz time!
3 lucky winners get a training or certification voucher!
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34. Quiz time!
1. What are the 2 ways to call a function with 2 arguments?
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• 1. What are the 2 ways to call a function with 2 arguments?
– Function(arg0, arg1)
– Arg0 function arg1
Quiz time!

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2. What is the output type of ++(LocalTime, TimeZone)?
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• 2. What is the output type of ++(LocalTime, TimeZone)?
– Time
Quiz time!

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3. Which syntax will return an error?
a) {({a:"a"}),({b:"b"})}
b) {([{a:"a"},{b:"b"}])}
c) {({a:"a"},{b:"b"})}
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• 3. Which syntax will return an error?
– a) {({a:"a"}),({b:"b"})}
– b) {([{a:"a"},{b:"b"}])}
– c) {({a:"a"},{b:"b"})}
Quiz time!

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• 4. What are the characters missing here to get the expected output?
Quiz time!

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• 4. What are the characters missing here to get the expected output?
– $()
Quiz time!

42. Quiz time!
5. Will this expression return an error?
"I can do this! $(sum([1,2,3]))"

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• 5. Will this expression return an error?
– "I can do this! $(sum([1,2,3]))”
– Answer: no
Quiz time!

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• 6. What is the keyword that is missing here to get the expected
output?
Quiz time!

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• 6. What is the keyword that is missing here to get the expected
output?
– default
Quiz time!

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• 7. Will this expression return an error? (just answer yes or no)
Quiz Time!

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• 7. Will this expression return an error? (just answer yes or no)
– Yes
Quiz Time!

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• 8. How can this expression be fixed to get the expected output?
(provide the complete script needed, under the ---)
Quiz Time!

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• 8. How can this expression be fixed to get the expected output?
(provide the complete script needed, under the ---)
Quiz Time!

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What’s next
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• Share:
– Tweet your pictures with the hashtag #MuleMeetup
– Invite your network to join: https://meetups.mulesoft.com/toronto
• Feedback:
– Contact your organizers Alex, Mahesh, Pravallika, Kishore to suggest topics
– Contact MuleSoft at meetup@mulesoft.com for ways to improve the program

51. See you next time
Please send topic suggestions to the organizers