[Gradle, JS] Add test with dynamic webpack.config.d

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt

@@ -830,4 +830,20 @@ abstract class AbstractKotlin2JsGradlePluginIT(val irBackend: Boolean) : BaseGra
             }
         }
     }
+
+    @Test
+    fun testDynamicWebpackConfigD() {
+        with(Project("js-dynamic-webpack-config-d")) {
+            setupWorkingDir()
+            gradleBuildScript().modify(::transformBuildScriptWithPluginsDsl)
+
+            build(
+                "build"
+            ) {
+                assertSuccessful()
+                assertFileExists("build/js/packages/js-dynamic-webpack-config-d")
+                assertFileContains("build/js/packages/js-dynamic-webpack-config-d/webpack.config.js", "// hello from patch.js")
+            }
+        }
+    }
 }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/js-dynamic-webpack-config-d/build.gradle.kts

@@ -0,0 +1,36 @@
+plugins {
+    kotlin("js") version "<pluginMarkerVersion>"
+}
+
+group = "com.example"
+version = "1.0"
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+kotlin {
+    js {
+        binaries.executable()
+        browser()
+    }
+}
+
+tasks.register("foo") {
+    doLast {
+        val dir = projectDir.resolve("webpack.config.d")
+        dir.mkdirs()
+        val file = dir.resolve("patch.js")
+        file.createNewFile()
+        file.writeText("// hello from patch.js")
+    }
+}
+
+tasks.named("browserTest") {
+    enabled = false
+}
+
+tasks.withType<org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpack> {
+    dependsOn("foo")
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/js-dynamic-webpack-config-d/settings.gradle.kts

@@ -0,0 +1,8 @@
+pluginManagement {
+    repositories {
+        mavenLocal()
+        gradlePluginPortal()
+    }
+}
+
+rootProject.name = "js-dynamic-webpack-config-d"

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/js-dynamic-webpack-config-d/src/main/kotlin/Main.kt

@@ -0,0 +1,5 @@
+package com.example
+
+fun main() {
+    println("Hello, Webpack")
+}