[BTA tests] Introduce BaseTest providing CompilationService instance

^KT-61860 In Progress

compiler/build-tools/kotlin-build-tools-api-tests/src/main/kotlin/compilation/model/BaseCompilationTest.kt

@@ -10,7 +10,7 @@ import org.junit.jupiter.api.io.TempDir
 import java.nio.file.Path
 
 @TestDataPath("\$CONTENT_ROOT/../main/resources/modules")
-abstract class BaseCompilationTest {
+abstract class BaseCompilationTest : BaseTest() {
     @TempDir
     lateinit var workingDirectory: Path
 }

compiler/build-tools/kotlin-build-tools-api-tests/src/main/kotlin/compilation/model/BaseTest.kt

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.buildtools.api.tests.compilation.model
+
+import org.jetbrains.kotlin.buildtools.api.CompilationService
+
+abstract class BaseTest {
+    companion object {
+        val compilationService: CompilationService by lazy {
+            CompilationService.loadImplementation(BaseTest::class.java.classLoader)
+        }
+    }
+}

compiler/build-tools/kotlin-build-tools-api-tests/src/main/kotlin/compilation/model/DefaultStrategyAgnosticCompilationTestArgumentProvider.kt

@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.buildtools.api.tests.compilation.model
 
-import org.jetbrains.kotlin.buildtools.api.CompilationService
 import org.junit.jupiter.api.Named.named
 import org.junit.jupiter.api.extension.ExtensionContext
 import org.junit.jupiter.params.provider.Arguments
@@ -14,9 +13,8 @@ import java.util.stream.Stream
 import kotlin.streams.asStream
 
 class DefaultStrategyAgnosticCompilationTestArgumentProvider : ArgumentsProvider {
-    private val compilationService = CompilationService.loadImplementation(this.javaClass.classLoader)
-
     override fun provideArguments(context: ExtensionContext): Stream<out Arguments> {
+        val compilationService = BaseTest.compilationService
         return sequenceOf(
             named("in-process", compilationService.makeCompilerExecutionStrategyConfiguration().useInProcessStrategy()),
             named("within daemon", compilationService.makeCompilerExecutionStrategyConfiguration().useDaemonStrategy(emptyList())),

compiler/build-tools/kotlin-build-tools-api-tests/src/main/kotlin/compilation/model/JvmModule.kt

@@ -40,7 +40,7 @@ class JvmModule(
         val stdlibLocation =
             KotlinVersion::class.java.protectionDomain.codeSource.location.toURI().toPath() // compile against the provided stdlib
         val dependencyFiles = dependencies.map { it.location }.plusElement(stdlibLocation)
-        val compilationConfig = project.compilationService.makeJvmCompilationConfiguration()
+        val compilationConfig = BaseTest.compilationService.makeJvmCompilationConfiguration()
         compilationConfigAction(compilationConfig)
         compilationConfig.useLogger(kotlinLogger)
         val defaultCompilationArguments = listOf(
@@ -50,7 +50,7 @@ class JvmModule(
             "-cp", dependencyFiles.joinToString(File.pathSeparator),
             "-module-name", moduleName,
         )
-        return project.compilationService.compileJvm(
+        return BaseTest.compilationService.compileJvm(
             project.projectId,
             strategyConfig,
             compilationConfig,
@@ -60,8 +60,10 @@ class JvmModule(
     }
 
     private fun generateClasspathSnapshot(dependency: Dependency): Path {
-        val snapshot =
+        val snapshot = BaseTest.compilationService.calculateClasspathSnapshot(
-            project.compilationService.calculateClasspathSnapshot(dependency.location.toFile(), ClassSnapshotGranularity.CLASS_MEMBER_LEVEL)
+            dependency.location.toFile(),
+            ClassSnapshotGranularity.CLASS_MEMBER_LEVEL
+        )
         val hash = snapshot.classSnapshots.values
             .filterIsInstance<AccessibleClassSnapshot>()
             .withIndex()

compiler/build-tools/kotlin-build-tools-api-tests/src/main/kotlin/compilation/model/Project.kt

@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.buildtools.api.tests.compilation.model
 
-import org.jetbrains.kotlin.buildtools.api.CompilationService
 import org.jetbrains.kotlin.buildtools.api.ProjectId
 import java.nio.file.Path
 import java.nio.file.Paths
@@ -18,7 +17,6 @@ class Project(
     val projectDirectory: Path,
 ) {
     val projectId = ProjectId.ProjectUUID(UUID.randomUUID())
-    val compilationService = CompilationService.loadImplementation(this.javaClass.classLoader)
 
     fun module(
         moduleName: String,
@@ -37,7 +35,7 @@ class Project(
     }
 
     fun endCompilationRound() {
-        compilationService.finishProjectCompilation(projectId)
+        BaseTest.compilationService.finishProjectCompilation(projectId)
     }
 }
 

compiler/build-tools/kotlin-build-tools-api-tests/src/testCompatibility/kotlin/ExampleCompatibilityTest.kt

@@ -5,16 +5,14 @@
 
 package org.jetbrains.kotlin.buildtools.api.tests
 
-import org.jetbrains.kotlin.buildtools.api.CompilationService
+import org.jetbrains.kotlin.buildtools.api.tests.compilation.model.BaseTest
 import org.junit.jupiter.api.Assertions
 import org.junit.jupiter.api.Disabled
 import org.junit.jupiter.api.DisplayName
 import org.junit.jupiter.api.Test
 
 @Disabled("Example tests for evaluation purposes of the DSL")
-class ExampleCompatibilityTest {
+class ExampleCompatibilityTest : BaseTest() {
-    private val compilationService = CompilationService.loadImplementation(ExampleCompatibilityTest::class.java.classLoader)
-
     @Test
     @DisplayName("Sample compatibility test that is run as part of each test suit")
     fun testDefaultNonIncrementalSettings() {