Adding transaction handling to Unit Tests

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Talk from ESUG19, Cologne, Germany

Adding transaction handling
to Unit Tests
The why, the how and the journey

1992 - 2012
Deployment was mostly a manual process
No unit tests
Feature branches
VisualWorks & GemStone

2012 - 2019
90 % Deployment automated
55000 methods
Trunk based development
8000 unit tests

No transaction handling in
unit tests

0
receivedMessages process
10
processedMessages
9
receivedMessages process
0
processedMessages
1
failedMessages

2
receivedMessages process
7
processedMessages
1
failedMessages

Koos
Piet
Sannie
Commit
both
Koos
Sannie
Piet
Koos
Piet
Sannie
Abort nested
Koos
Piet
Koos
Piet
Sannie
Commit nested, Abort outer
(unit tests)
Koos
Piet
Sannie
Commit nested,
Abort nested, Commit outer
Koos
Sannie
Piet
Marie
1
2
bT
bNT
cT
cT

Auto mode

Transaction level 2
Transaction level 1
beginTransaction
abortTransaction
beginNestedTransaction
Check
transaction
level
Transaction level 2
Transaction level 1
abortTransaction
abortTransaction
beginNestedTransaction
Check
transaction
level

Transaction level 2
Transaction level 1
commitTransaction
commitTransaction
beginNestedTransaction
Check
transaction
level
Transaction level 2
Transaction level 1
inTransaction
Check
transaction
level

Manual mode

Transaction level 2
Transaction level 1
beginTransaction
System abortTransaction
System beginNestedTransaction
Check
transaction
level
Transaction level 2
Transaction level 1
abortTransactionSystem abortTransaction
System beginNestedTransaction
Check
transaction
level
beginTransactionExplicityCalled := true
beginTransactionExplicityCalled := false

Transaction level 2
Transaction level 1
commitTransaction
commitTransaction
beginNestedTransaction
Check
transaction
level
Transaction level 2
Transaction level 1
inTransaction
Check
transaction
level
Check
beginTransactionExplicityCalled
beginTransactionExplicityCalled := false
Check beginTransactionExplicityCalled

Commit fails

methodA
self commit
self methodB
methodB
self commit
methodA
self methodB
methodB
self commit

Using framework
Commit test setup (especially when in
manual mode)
Override defaultTransactionMode

Limitations
Can’t use nested transactions in our
production code
Canonical framework

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Adding transaction handling to Unit Tests

1. Adding transaction handling to Unit Tests The why, the how and the journey

2. 1992 - 2012 Deployment was mostly a manual process No unit tests Feature branches VisualWorks & GemStone

3. 2012 - 2019 90 % Deployment automated 55000 methods Trunk based development 8000 unit tests

4. No transaction handling in unit tests

5. 0 receivedMessages process 10 processedMessages 9 receivedMessages process 0 processedMessages 1 failedMessages

6. 2 receivedMessages process 7 processedMessages 1 failedMessages

7. Koos Piet Sannie Commit both Koos Sannie Piet Koos Piet Sannie Abort nested Koos Piet Koos Piet Sannie Commit nested, Abort outer (unit tests) Koos Piet Sannie Commit nested, Abort nested, Commit outer Koos Sannie Piet Marie 1 2 bT bNT cT cT

9. Transaction level 2 Transaction level 1 beginTransaction abortTransaction beginNestedTransaction Check transaction level Transaction level 2 Transaction level 1 abortTransaction abortTransaction beginNestedTransaction Check transaction level

10. Transaction level 2 Transaction level 1 commitTransaction commitTransaction beginNestedTransaction Check transaction level Transaction level 2 Transaction level 1 inTransaction Check transaction level

11. Manual mode

12. Transaction level 2 Transaction level 1 beginTransaction System abortTransaction System beginNestedTransaction Check transaction level Transaction level 2 Transaction level 1 abortTransactionSystem abortTransaction System beginNestedTransaction Check transaction level beginTransactionExplicityCalled := true beginTransactionExplicityCalled := false

13. Transaction level 2 Transaction level 1 commitTransaction commitTransaction beginNestedTransaction Check transaction level Transaction level 2 Transaction level 1 inTransaction Check transaction level Check beginTransactionExplicityCalled beginTransactionExplicityCalled := false Check beginTransactionExplicityCalled

14. Commit fails

15. methodA self commit self methodB methodB self commit methodA self methodB methodB self commit

16. Using framework Commit test setup (especially when in manual mode) Override defaultTransactionMode

17. Limitations Can’t use nested transactions in our production code Canonical framework