Ignore abstract class constructors

CHANGELOG.md

@@ -3,6 +3,11 @@
 ## [Unreleased]
 [Unreleased]: https://github.com/cashapp/burst/compare/0.6.0...HEAD
 
+**Fixed**
+
+ * Do not attempt to parameterize constructors of `abstract` test classes.
+
+
 ## [0.6.0] *(2024-10-23)*
 [0.6.0]: https://github.com/cashapp/burst/releases/tag/0.6.0
 

burst-gradle-plugin/src/test/kotlin/app/cash/burst/gradle/BurstGradlePluginTest.kt

@@ -112,6 +112,26 @@ class BurstGradlePluginTest {
     assertThat(sampleSpecialization.skipped).isFalse()
   }
 
+  @Test
+  fun abstractClasses() {
+    val projectDir = File("src/test/projects/abstractClasses")
+
+    val taskName = ":lib:test"
+    val result = createRunner(projectDir, "clean", taskName).build()
+    assertThat(result.task(taskName)!!.outcome).isIn(*SUCCESS_OUTCOMES)
+
+    val testResults = projectDir.resolve("lib/build/test-results")
+    val testXmlFile = testResults.resolve("test/TEST-CoffeeTest.xml")
+
+    val testSuite = readTestSuite(testXmlFile)
+
+    assertThat(testSuite.testCases.map { it.name }).containsExactlyInAnyOrder(
+      "test_Milk",
+      "test_None",
+      "test_Oat",
+    )
+  }
+
   @Test
   fun classParameters() {
     val projectDir = File("src/test/projects/classParameters")

burst-gradle-plugin/src/test/projects/abstractClasses/build.gradle.kts

@@ -0,0 +1,37 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+import org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile
+
+buildscript {
+  repositories {
+    maven {
+      url = file("$rootDir/../../../../../build/testMaven").toURI()
+    }
+    mavenCentral()
+    google()
+  }
+  dependencies {
+    classpath("app.cash.burst:burst-gradle-plugin:${project.property("burstVersion")}")
+    classpath(libs.kotlin.gradlePlugin)
+  }
+}
+
+allprojects {
+  repositories {
+    maven {
+      url = file("$rootDir/../../../../../build/testMaven").toURI()
+    }
+    mavenCentral()
+    google()
+  }
+
+  tasks.withType(JavaCompile::class.java).configureEach {
+    sourceCompatibility = "1.8"
+    targetCompatibility = "1.8"
+  }
+
+  tasks.withType(KotlinJvmCompile::class.java).configureEach {
+    compilerOptions {
+      jvmTarget.set(JvmTarget.JVM_1_8)
+    }
+  }
+}

burst-gradle-plugin/src/test/projects/abstractClasses/lib/build.gradle.kts

@@ -0,0 +1,8 @@
+plugins {
+  kotlin("jvm")
+  id("app.cash.burst")
+}
+
+dependencies {
+  testImplementation(kotlin("test"))
+}

burst-gradle-plugin/src/test/projects/abstractClasses/lib/src/test/kotlin/CoffeeTest.kt

@@ -0,0 +1,16 @@
+import app.cash.burst.Burst
+import kotlin.test.Test
+
+@Burst
+abstract class BaseCoffeeTest(
+  private val name: String,
+) {
+  @Test
+  fun test(dairy: Dairy) {
+    println("running $name $dairy")
+  }
+}
+
+class CoffeeTest : BaseCoffeeTest("decaf")
+
+enum class Dairy { None, Milk, Oat }

burst-gradle-plugin/src/test/projects/abstractClasses/settings.gradle.kts

@@ -0,0 +1,9 @@
+dependencyResolutionManagement {
+  versionCatalogs {
+    create("libs") {
+      from(files("../../../../../gradle/libs.versions.toml"))
+    }
+  }
+}
+
+include(":lib")

burst-kotlin-plugin/src/main/kotlin/app/cash/burst/kotlin/BurstIrGenerationExtension.kt

@@ -19,6 +19,7 @@ import org.jetbrains.kotlin.backend.common.IrElementTransformerVoidWithContext
 import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
 import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
 import org.jetbrains.kotlin.cli.common.messages.MessageCollector
+import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
@@ -43,7 +44,7 @@ class BurstIrGenerationExtension(
           return classDeclaration
         }
 
-        if (classHasAtBurst) {
+        if (classHasAtBurst && classDeclaration.modality != Modality.ABSTRACT) {
           ClassSpecializer(
             pluginContext = pluginContext,
             originalParent = currentFile,