Use test classpath for annotations.jar search

Got unstable behaviour in 202 test because of setting
idea.home.path during the compiler execution.

idea/tests/org/jetbrains/kotlin/psi/KotlinLibInjectionTest.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.psi
 
 import com.intellij.lang.html.HTMLLanguage
+import com.intellij.openapi.application.ApplicationManager
 import com.intellij.testFramework.LightProjectDescriptor
 import org.intellij.lang.annotations.Language
 import org.intellij.lang.regexp.RegExpLanguage
@@ -14,13 +15,10 @@ import org.jetbrains.kotlin.idea.test.SdkAndMockLibraryProjectDescriptor
 import org.jetbrains.kotlin.test.JUnit3WithIdeaConfigurationRunner
 import org.junit.runner.RunWith
 import java.io.File
+import java.net.URLClassLoader
 
 @RunWith(JUnit3WithIdeaConfigurationRunner::class)
 class KotlinLibInjectionTest : AbstractInjectionTest() {
-    override fun setUp() {
-        super.setUp()
-    }
-
     fun testFunInjection() = assertInjectionPresent(
         """
             import injection.html
@@ -45,13 +43,25 @@ class KotlinLibInjectionTest : AbstractInjectionTest() {
         doInjectionPresentTest(text, languageId = languageId, unInjectShouldBePresent = false)
     }
 
-
     override fun getProjectDescriptor(): LightProjectDescriptor {
-        val ideaSdkPath = System.getProperty("idea.home.path")?.takeIf { File(it).isDirectory }
+        val urls = (ApplicationManager::class.java.classLoader as? URLClassLoader)?.urLs
-            ?: throw RuntimeException("Unable to get a valid path from 'idea.home.path' property, please point it to the Idea location")
+            ?: error("Can't find path urls in classloader")
+
+        val libName = "annotations.jar"
+        val libCandidates = urls
+            .map { it.path.replace("\\", "/") }
+            .filter { it.endsWith("/$libName") }
+
+        val libPath = libCandidates.singleOrNull()
+            ?: error("Can't find single $libName in classpath among $libCandidates")
+
+        val libFile = File(libPath).also { file ->
+            require(file.exists()) { "Can't find library: ${file.absolutePath}" }
+        }
+
         return SdkAndMockLibraryProjectDescriptor(
             PluginTestCaseBase.getTestDataPathBase() + "/injection/lib/", false, false, false, true,
-            listOf(File(ideaSdkPath, "lib/annotations.jar").absolutePath)
+            listOf(libFile.absolutePath)
         )
     }
 }