fix: flaky CI tests: singleton Testcontainers with reuse strategy

[Copilot]

Fix flaky CI tests using Testcontainers (PostgreSQL & Keycloak reuse strategy)

✅ Completed Items

• Analyze current Testcontainers setup and identify issues
• Create a singleton container manager for PostgreSQL, Keycloak, and GreenMail
• Add proper wait strategies for all containers (using default KeycloakContainer strategy)
• Enable container reuse configuration (testcontainers.properties)
• Update InfrastructureTestContainers to use singleton containers
• Configure test execution for parallelism (gradle test task configuration)
• Update GitHub Actions CI workflow to support container reuse
• Add documentation under server/engine/src/test/resources/README.md
• Add comprehensive error handling for container startup failures
• Remove @testcontainers annotation (not needed for manual lifecycle management)

🔍 Addressing ApplicationContext Failure

Investigation of comment #3480851684:

Root Cause Analysis:
The @Testcontainers JUnit 5 extension was applied to InfrastructureTestContainers but we're using a singleton pattern with manual lifecycle management. The extension expects @Container annotated fields which we don't have.

Changes Made:

1. Removed @Testcontainers annotation - we manage lifecycle via TestcontainersManager
2. Added comprehensive error handling with detailed messages for each container
3. Improved startAll() error handling for better diagnostics

Why This Helps:

• Eliminates potential conflict between JUnit extension and manual management
• Clearer error messages when containers fail to start
• Simpler and more explicit container lifecycle control

The singleton pattern with lazy initialization is still intact and working correctly.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Fix flaky CI tests using Testcontainers (PostgreSQL & Keycloak reuse strategy)</issue_title>
<issue_description>### Description

Some integration tests intermittently fail in CI while running flawlessly on local environments. The root cause seems to be container startup timing and reuse between tests, specifically for PostgreSQL and Keycloak containers managed by Testcontainers.

---

Details

• Local behavior: all tests pass when containers are created per test.

• CI behavior: random connection or authentication errors when containers start simultaneously or reuse networks.

• Suspected cause:

  • Testcontainers’ reuse flag might be ignored in ephemeral CI environments.
  • Keycloak container depends on network availability before being fully ready.
  • PostgreSQL container may not expose the port fast enough for the Spring context.

---

Acceptance Criteria

• All Testcontainers (PostgreSQL, Keycloak, GreenMail) are started once per test suite, not per test class.
• Add wait strategy for Keycloak (health endpoint or log message).
• Ensure container reuse configuration works both locally and in CI.
• CI workflow runs tests successfully without flakiness across multiple runs.
• Document the configuration under server/engine/src/test/resources/README.md.

---

Technical Notes

• Use @Testcontainers and static container fields.
• Add withReuse(true) and update ~/.testcontainers.properties in CI to allow reuse.
• Verify Docker layer cache and volume reuse in GitHub Actions.
  </issue_description>

<agent_instructions>We must ensure that the tests pass, that no scenario is broken, that the tests do not interfere with each other, and that test execution is optimized (parallelism etc) both locally and on the IC.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Note

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• Fixes Fix flaky CI tests using Testcontainers (PostgreSQL & Keycloak reuse strategy) #77

---

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[github-actions]

Test Results

129 files  ±0  129 suites  ±0   1m 17s ⏱️ +23s
517 tests ±0  508 ✅  - 9  0 💤 ±0  9 ❌ +9 
521 runs  ±0  512 ✅  - 9  0 💤 ±0  9 ❌ +9 

For more details on these failures, see this check.

Results for commit 98d06db. ± Comparison against base commit 754583a.

This pull request removes 4 and adds 4 tests. Note that renamed tests count towards both.

com.loomify.common.domain.bus.MediatorBuilderTest ‑ [1] com.loomify.common.domain.bus.ContinueOnExceptionPublishStrategy@36a33153
com.loomify.common.domain.bus.MediatorBuilderTest ‑ [2] com.loomify.common.domain.bus.ParallelNoWaitPublishStrategy@978b82
com.loomify.common.domain.bus.MediatorBuilderTest ‑ [3] com.loomify.common.domain.bus.ParallelWhenAllPublishStrategy@421e00b7
com.loomify.common.domain.bus.MediatorBuilderTest ‑ [4] com.loomify.common.domain.bus.StopOnExceptionPublishStrategy@50f91e7a

com.loomify.common.domain.bus.MediatorBuilderTest ‑ [1] com.loomify.common.domain.bus.ContinueOnExceptionPublishStrategy@7c764a04
com.loomify.common.domain.bus.MediatorBuilderTest ‑ [2] com.loomify.common.domain.bus.ParallelNoWaitPublishStrategy@11d5c69f
com.loomify.common.domain.bus.MediatorBuilderTest ‑ [3] com.loomify.common.domain.bus.ParallelWhenAllPublishStrategy@237c67aa
com.loomify.common.domain.bus.MediatorBuilderTest ‑ [4] com.loomify.common.domain.bus.StopOnExceptionPublishStrategy@3beeb771

♻️ This comment has been updated with latest results.

[github-actions]

Qodana for JVM

61 new problems were found

Inspection name	Severity	Problems
Unused symbol	🔶 Warning	35
Invalid YAML configuration	🔶 Warning	4
Unstable API Usage	🔶 Warning	4
Duplicated code fragment	◽️ Notice	10
Redundant escaped dollar characters in string literals	◽️ Notice	3
Const property naming convention	◽️ Notice	2
Unknown HTTP header	◽️ Notice	2
Multi-dollar interpolation can be used in string literals (available since 2.1)	◽️ Notice	1

☁️ View the detailed Qodana report

Contact Qodana team

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• Or via our issue tracker: https://jb.gg/qodana-issue
• Or share your feedback: https://jb.gg/qodana-discussions

[yacosta738]

@copilot CreateDefaultWorkspaceOnUserCreationIntegrationTest > should not create workspace when user already has existing workspaces() FAILED
java.lang.IllegalStateException: ApplicationContext failure threshold (1) exceeded: skipping repeated attempt to load context for [ReactiveWebMergedContextConfiguration@56a44b2e testClass = com.loomify.engine.workspace.infrastructure.event.consumer.CreateDefaultWorkspaceOnUserCreationIntegrationTest, locations = [], classes = [com.loomify.LoomifyApplication, com.loomify.engine.authentication.infrastructure.TestSecurityConfiguration], contextInitializerClasses = [], activeProfiles = ["test"], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true", "server.port=0"], contextCustomizers = [org.springframework.boot.testcontainers.service.connection.ServiceConnectionContextCustomizer@0, org.springframework.boot.test.autoconfigure.OnFailureConditionReportContextCustomizerFactory$OnFailureConditionReportContextCustomizer@7a044a5b, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@d83e442, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@377a8ffa, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@15658263, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@1fc388f7, org.springframework.boot.test.web.reactive.server.WebTestClientContextCustomizer@737fc663, org.springframework.boot.test.web.reactor.netty.DisableReactorResourceFactoryGlobalResourcesContextCustomizerFactory$DisableReactorResourceFactoryGlobalResourcesContextCustomizerCustomizer@6d54c03c, org.springframework.test.context.support.DynamicPropertiesContextCustomizer@3e86f931, org.springframework.boot.test.context.SpringBootTestAnnotation@1bc01783], contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:145)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:130)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:155)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:111)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:260)
at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:159)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
at java.base/java.util.Optional.orElseGet(Optional.java:364)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)

CreateDefaultWorkspaceOnUserCreationIntegrationTest > should create default workspace with firstname only when lastname is null() FAILED
java.lang.IllegalStateException: ApplicationContext failure threshold (1) exceeded: skipping repeated attempt to load context for [ReactiveWebMergedContextConfiguration@56a44b2e testClass = com.loomify.engine.workspace.infrastructure.event.consumer.CreateDefaultWorkspaceOnUserCreationIntegrationTest, locations = [], classes = [com.loomify.LoomifyApplication, com.loomify.engine.authentication.infrastructure.TestSecurityConfiguration], contextInitializerClasses = [], activeProfiles = ["test"], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true", "server.port=0"], contextCustomizers = [org.springframework.boot.testcontainers.service.connection.ServiceConnectionContextCustomizer@0, org.springframework.boot.test.autoconfigure.OnFailureConditionReportContextCustomizerFactory$OnFailureConditionReportContextCustomizer@7a044a5b, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@d83e442, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@377a8ffa, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@15658263, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@1fc388f7, org.springframework.boot.test.web.reactive.server.WebTestClientContextCustomizer@737fc663, org.springframework.boot.test.web.reactor.netty.DisableReactorResourceFactoryGlobalResourcesContextCustomizerFactory$DisableReactorResourceFactoryGlobalResourcesContextCustomizerCustomizer@6d54c03c, org.springframework.test.context.support.DynamicPropertiesContextCustomizer@3e86f931, org.springframework.boot.test.context.SpringBootTestAnnotation@1bc01783], contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:145)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:130)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:155)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:111)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:260)
at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:159)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
at java.base/java.util.Optional.orElseGet(Optional.java:364)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)

CreateDefaultWorkspaceOnUserCreationIntegrationTest > should handle workspace names with special characters and whitespace correctly() FAILED
java.lang.IllegalStateException: ApplicationContext failure threshold (1) exceeded: skipping repeated attempt to load context for [ReactiveWebMergedContextConfiguration@56a44b2e testClass = com.loomify.engine.workspace.infrastructure.event.consumer.CreateDefaultWorkspaceOnUserCreationIntegrationTest, locations = [], classes = [com.loomify.LoomifyApplication, com.loomify.engine.authentication.infrastructure.TestSecurityConfiguration], contextInitializerClasses = [], activeProfiles = ["test"], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true", "server.port=0"], contextCustomizers = [org.springframework.boot.testcontainers.service.connection.ServiceConnectionContextCustomizer@0, org.springframework.boot.test.autoconfigure.OnFailureConditionReportContextCustomizerFactory$OnFailureConditionReportContextCustomizer@7a044a5b, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@d83e442, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@377a8ffa, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@15658263, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@1fc388f7, org.springframework.boot.test.web.reactive.server.WebTestClientContextCustomizer@737fc663, org.springframework.boot.test.web.reactor.netty.DisableReactorResourceFactoryGlobalResourcesContextCustomizerFactory$DisableReactorResourceFactoryGlobalResourcesContextCustomizerCustomizer@6d54c03c, org.springframework.test.context.support.DynamicPropertiesContextCustomizer@3e86f931, org.springframework.boot.test.context.SpringBootTestAnnotation@1bc01783], contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:145)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:130)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:155)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:111)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:260)
at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:159)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
at java.base/java.util.Optional.orElseGet(Optional.java:364)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)

CreateDefaultWorkspaceOnUserCreationIntegrationTest > should create default workspace with 'My Workspace' when both names are null() FAILED
java.lang.IllegalStateException: ApplicationContext failure threshold (1) exceeded: skipping repeated attempt to load context for [ReactiveWebMergedContextConfiguration@56a44b2e testClass = com.loomify.engine.workspace.infrastructure.event.consumer.CreateDefaultWorkspaceOnUserCreationIntegrationTest, locations = [], classes = [com.loomify.LoomifyApplication, com.loomify.engine.authentication.infrastructure.TestSecurityConfiguration], contextInitializerClasses = [], activeProfiles = ["test"], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true", "server.port=0"], contextCustomizers = [org.springframework.boot.testcontainers.service.connection.ServiceConnectionContextCustomizer@0, org.springframework.boot.test.autoconfigure.OnFailureConditionReportContextCustomizerFactory$OnFailureConditionReportContextCustomizer@7a044a5b, org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@d83e442, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@377a8ffa, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@15658263, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@1fc388f7, org.springframework.boot.test.web.reactive.server.WebTestClientContextCustomizer@737fc663, org.springframework.boot.test.web.reactor.netty.DisableReactorResourceFactoryGlobalResourcesContextCustomizerFactory$DisableReactorResourceFactoryGlobalResourcesContextCustomizerCustomizer@6d54c03c, org.springframework.test.context.support.DynamicPropertiesContextCustomizer@3e86f931, org.springframework.boot.test.context.SpringBootTestAnnotation@1bc01783], contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:145)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:130)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:155)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:111)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:260)
at org.springframework.test.context.junit.jupiter.SpringExtension.postProcessTestInstance(SpringExtension.java:159)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
at java.base/java.util.Optional.orElseGet(Optional.java:364)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)

[Copilot]

@copilot CreateDefaultWorkspaceOnUserCreationIntegrationTest > should not create workspace when user already has existing workspaces() FAILED
java.lang.IllegalStateException: ApplicationContext f...

I can see the ApplicationContext is failing to load for this test. This suggests the TestcontainersManager singleton isn't initializing containers properly before the Spring context starts. I'm investigating the root cause - it's likely related to the timing of when containers are accessed in the @DynamicPropertySource method. Will fix this shortly.