Don't combine java plugin with kmp plugin

Author: Goooler

src/functionalTest/kotlin/com/github/jengelman/gradle/plugins/shadow/BasePluginTest.kt

@@ -103,15 +103,15 @@ abstract class BasePluginTest {
   val outputServerShadowJar: JarPath get() = jarPath("server/build/libs/server-1.0-all.jar")
 
   fun getDefaultProjectBuildScript(
-    javaPlugin: String = "java",
+    plugin: String = "java",
     withGroup: Boolean = false,
     withVersion: Boolean = false,
   ): String {
     val groupInfo = if (withGroup) "group = 'my'" else ""
     val versionInfo = if (withVersion) "version = '1.0'" else ""
     return """
       plugins {
-        id('$javaPlugin')
+        id('$plugin')
         id('com.gradleup.shadow')
       }
       $groupInfo

src/functionalTest/kotlin/com/github/jengelman/gradle/plugins/shadow/KmpPluginTest.kt

@@ -3,14 +3,26 @@ package com.github.jengelman.gradle.plugins.shadow
 import assertk.assertThat
 import com.github.jengelman.gradle.plugins.shadow.util.containsEntries
 import kotlin.io.path.appendText
+import kotlin.io.path.writeText
+import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 
 class KmpPluginTest : BasePluginTest() {
+  @BeforeEach
+  override fun setup() {
+    super.setup()
+    val projectBuildScript = getDefaultProjectBuildScript(
+      plugin = "org.jetbrains.kotlin.multiplatform",
+      withGroup = true,
+      withVersion = true,
+    )
+    projectScriptPath.writeText(projectBuildScript)
+  }
+
   @Test
   fun compatKmpJvmTarget() {
     projectScriptPath.appendText(
       """
-        apply plugin: 'org.jetbrains.kotlin.multiplatform'
         kotlin {
           jvm()
           sourceSets {