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fix(tests): resolve flaky Testcontainers lifecycle causing intermittent CI failures #5

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Merged
hechi merged 1 commit into from
Apr 3, 2026
Merged

fix(tests): resolve flaky Testcontainers lifecycle causing intermittent CI failures #5

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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Fixed
- **Flaky backend tests** — Resolved intermittent `PSQLException: Connection refused` errors in CI by fixing Testcontainers lifecycle mismatch (`@Container` moved to `companion object` for all `@TestInstance(PER_CLASS)` test classes) and disabling parallel test-class execution (`maxParallelForks = 1`) to prevent Exposed's global database registry from being overwritten mid-test by a concurrently running test class

## [6.3.0] - 2026-03-30

### Added
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1 change: 1 addition & 0 deletions backend/build.gradle.kts
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Expand Up @@ -86,4 +86,5 @@ tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach

tasks.test {
useJUnitPlatform()
maxParallelForks = 1
}
13 changes: 8 additions & 5 deletions backend/src/test/kotlin/com/shoppinglist/repository/ItemRepositoryTest.kt
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Expand Up @@ -23,11 +23,14 @@ import kotlin.test.assertTrue
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class ItemRepositoryTest {

@Container
private val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
companion object {
@Container
@JvmField
val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
}

private lateinit var database: Database
private lateinit var listRepository: ListRepository
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13 changes: 8 additions & 5 deletions backend/src/test/kotlin/com/shoppinglist/repository/ListRepositoryTest.kt
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Expand Up @@ -24,11 +24,14 @@ import kotlin.test.assertTrue
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class ListRepositoryTest {

@Container
private val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
companion object {
@Container
@JvmField
val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
}

private lateinit var database: Database
private lateinit var listRepository: ListRepository
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13 changes: 8 additions & 5 deletions backend/src/test/kotlin/com/shoppinglist/repository/PushSubscriptionRepositoryTest.kt
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Expand Up @@ -27,11 +27,14 @@ import kotlin.test.assertTrue
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class PushSubscriptionRepositoryTest {

@Container
private val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
companion object {
@Container
@JvmField
val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
}

private lateinit var database: Database
private lateinit var listRepository: ListRepository
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13 changes: 8 additions & 5 deletions backend/src/test/kotlin/com/shoppinglist/repository/TransactionTest.kt
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Expand Up @@ -27,11 +27,14 @@ import kotlin.test.assertTrue
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class TransactionTest {

@Container
private val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
companion object {
@Container
@JvmField
val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
}

private lateinit var database: Database
private lateinit var listRepository: ListRepository
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13 changes: 8 additions & 5 deletions backend/src/test/kotlin/com/shoppinglist/routes/ListRoutesTest.kt
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Expand Up @@ -28,11 +28,14 @@ import kotlin.test.assertTrue
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class ListRoutesTest {

@Container
private val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
companion object {
@Container
@JvmField
val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
}

private lateinit var database: Database
private val json = Json { ignoreUnknownKeys = true }
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15 changes: 9 additions & 6 deletions backend/src/test/kotlin/com/shoppinglist/service/CleanupServiceTest.kt
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Expand Up @@ -27,12 +27,15 @@ import kotlin.test.assertNull
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class CleanupServiceTest {

@Container
private val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_cleanup")
.withUsername("test_user")
.withPassword("test_pass")

companion object {
@Container
@JvmField
val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_cleanup")
.withUsername("test_user")
.withPassword("test_pass")
}

private lateinit var database: Database
private lateinit var cleanupService: CleanupService
private lateinit var listRepository: ListRepositoryImpl
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13 changes: 8 additions & 5 deletions backend/src/test/kotlin/com/shoppinglist/websocket/WebSocketIntegrationTest.kt
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Expand Up @@ -30,11 +30,14 @@ import kotlin.test.assertTrue
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class WebSocketIntegrationTest {

@Container
private val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
companion object {
@Container
@JvmField
val postgres = PostgreSQLContainer("postgres:15-alpine")
.withDatabaseName("test_shopping_lists")
.withUsername("test_user")
.withPassword("test_pass")
}

private lateinit var database: Database
private val json = Json { ignoreUnknownKeys = true }
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