Checking exceptions in other threads. E.g. inspections pass thread.

idea/idea-test-framework/src/org/jetbrains/kotlin/idea/test/JetLightCodeInsightFixtureTestCase.kt

@@ -28,17 +28,23 @@ import com.intellij.openapi.util.io.FileUtil
 import com.intellij.openapi.util.text.StringUtil
 import com.intellij.openapi.vfs.newvfs.impl.VfsRootAccess
 import com.intellij.testFramework.LightProjectDescriptor
+import com.intellij.testFramework.LoggedErrorProcessor
 import com.intellij.testFramework.fixtures.LightCodeInsightFixtureTestCase
+import org.apache.log4j.Logger
 import org.jetbrains.kotlin.idea.actions.internal.KotlinInternalMode
 import org.jetbrains.kotlin.test.InTextDirectivesUtils
 import org.jetbrains.kotlin.test.JetTestUtils
+import org.jetbrains.kotlin.utils.addIfNotNull
 import org.jetbrains.kotlin.utils.rethrow
 import java.io.File
 import java.io.IOException
+import java.util.*
 
 public abstract class JetLightCodeInsightFixtureTestCase : LightCodeInsightFixtureTestCase() {
     private var kotlinInternalModeOriginalValue = false
 
+    private val exceptions = ArrayList<Throwable>()
+
     override fun setUp() {
         super.setUp()
         (StartupManager.getInstance(getProject()) as StartupManagerImpl).runPostStartupActivities()
@@ -48,15 +54,29 @@ public abstract class JetLightCodeInsightFixtureTestCase : LightCodeInsightFixtu
         KotlinInternalMode.enabled = true
 
         getProject().getComponent(javaClass<EditorTracker>())?.projectOpened()
+
+        LoggedErrorProcessor.setNewInstance(object : LoggedErrorProcessor() {
+            override fun processError(message: String?, t: Throwable?, details: Array<out String>?, logger: Logger) {
+                exceptions.addIfNotNull(t)
+                super.processError(message, t, details, logger)
+            }
+        })
     }
 
     override fun tearDown() {
+        LoggedErrorProcessor.restoreDefaultProcessor()
+
         KotlinInternalMode.enabled = kotlinInternalModeOriginalValue
         VfsRootAccess.disallowRootAccess(JetTestUtils.getHomeDirectory())
 
         unInvalidateBuiltins(getProject()) {
             super.tearDown()
         }
+
+        if (exceptions.isNotEmpty()) {
+            exceptions.forEach { it.printStackTrace() }
+            throw AssertionError("Exceptions in other threads happened")
+        }
     }
 
     override fun getProjectDescriptor(): LightProjectDescriptor