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Shared state

In this part you will see examples of shared state modifications in tests.

Sequential execution of tests

             time
 ─────────────────────────────►
 ┌───────────┐   ┌───────────┐
 │  test 1   │   │  test 2   │
 └─┬───┬───┬─┘   └─┬───┬───┬─┘
   │   │   │       │   │   │
   │+  │?  │-      │+  │?  │-
   │a  │a  │a      │a  │a  │a
   │   │   │       │   │   │
   ▼   ▼   ▼       ▼   ▼   ▼
   ✓   ✓   ✓       ✓   ✓   ✓

  symbol | description
  +      | add entity (`given/when` block)
  ?      | verify (`then` block)
  -      | remove entity/entities (`cleanup` block)
  a      | entity id
  *      | all entities
  ✓      | operation succeeded
  !      | operation failed

Possible problems after switching from sequential to parallel execution

Cannot create two entities with same id/name in test setup

             time
 ─────────────────────────────►
 ┌───────────┐
 │  test 1   │
 └─┬─────────┘
   │
 ┌─┼─────────┐
 │ │test 2   │
 └─┼──┬──────┘
   │  │
   │+ │+
   │a │a
   │  │
   ▼  ▼
   ✓  !

Cleanup in one test affects other tests

             time
 ─────────────────────────────►
 ┌───────────┐
 │  test 1   │
 └─┬───┬─┬───┘
   │   │ │
   │   │ │
 ┌─┼───┼─┼───┐
 │ │test 2   │
 └─┼─┬─┼─┼─┬─┘
   │ │ │ │ │
   │+│+│?│-│?
   │a│b│a│*│b
   │ │ │ │ │
   ▼ ▼ ▼ ▼ ▼
   ✓ ✓ ✓ ✓ !

Assertion is not precise enough

             time
 ─────────────────────────────►
 ┌───────────┐
 │  test 1   │
 └─┬─┬───────┘
   │ │
 ┌─┼─┼───────┐
 │ │test 2   │
 └─┼─┼─┬─┬───┘
   │ │ │ │
   │+│?│+│?(count)
   │a│a│b│*
   │ │ │ │
   ▼ ▼ ▼ ▼
   ✓ ✓ ✓ !

Exercise

Familiarize yourself with tests in this module.

  • Run tests ./gradlew --rerun-tasks :part1.1-shared-state:test :part1.1-shared-state:createTestsExecutionReport
  • Check reports
  • Enable parallel execution in SpockConfig.groovy
  • Run tests again ./gradlew --rerun-tasks :part1.1-shared-state:test :part1.1-shared-state:createTestsExecutionReport --continue

Some tests failed. Eliminate shared state by using different name in test cases.

Approach no. 1

  • Set a unique name value in each test.
  • Run tests again ./gradlew --rerun-tasks :part1.1-shared-state:test :part1.1-shared-state:createTestsExecutionReport --continue
  • Check output

Sample output:

name = testName 3
name = testName 1
name = testName 2

Approach no. 2

  • Add private UniqueValueGenerator generator = RandomUniqueValueGenerator.instance field.
  • Set name value in setup using name = generator.next()
  • Remove name assignments in tests.
  • Run tests again ./gradlew --rerun-tasks :part1.1-shared-state:test :part1.1-shared-state:createTestsExecutionReport --continue
  • Check output

Sample output:

name = BM8LX
name = Kbc28
name = boR1b

Approach no. 3

  • Add private UniqueValueGenerator generator = NextIntValueGenerator.instance field.
  • Set name value in setup using name = generator.next()
  • Run tests again ./gradlew --rerun-tasks :part1.1-shared-state:test :part1.1-shared-state:createTestsExecutionReport --continue
  • Check output

Sample output:

name = 3
name = 1
name = 2

Approach no. 4

  • Add private UniqueValueGenerator generator = new TestNameUniqueValueGenerator(specificationContext) field.
  • Set name value in setup using name = generator.next()
  • Run tests again ./gradlew --rerun-tasks :part1.1-shared-state:test :part1.1-shared-state:createTestsExecutionReport --continue
  • Check output

Sample output:

name = pl.allegro.tech.workshops.testsparallelexecution:SharedStateExampleTest:should remove file
name = pl.allegro.tech.workshops.testsparallelexecution:SharedStateExampleTest:should create dir
name = pl.allegro.tech.workshops.testsparallelexecution:SharedStateExampleTest:should create file

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