diff --git a/idea/tests/org/jetbrains/kotlin/findUsages/CustomUsageSearcherTest.kt b/idea/tests/org/jetbrains/kotlin/findUsages/CustomUsageSearcherTest.kt
index fe9951525b6..8aaa76c7212 100644
--- a/idea/tests/org/jetbrains/kotlin/findUsages/CustomUsageSearcherTest.kt
+++ b/idea/tests/org/jetbrains/kotlin/findUsages/CustomUsageSearcherTest.kt
@@ -5,21 +5,30 @@
 
 package org.jetbrains.kotlin.findUsages
 
+import com.intellij.find.findUsages.CustomUsageSearcher
+import com.intellij.find.findUsages.FindUsagesOptions
+import com.intellij.psi.PsiElement
+import com.intellij.usageView.UsageInfo
+import com.intellij.usages.Usage
+import com.intellij.usages.UsageInfo2UsageAdapter
+import org.jetbrains.kotlin.idea.KotlinFileType
+import org.jetbrains.kotlin.idea.maskExtensions
 import org.jetbrains.kotlin.idea.test.KotlinLightCodeInsightFixtureTestCaseBase
+import org.jetbrains.kotlin.idea.util.application.runReadAction
+
 
 class CustomUsageSearcherTest : KotlinLightCodeInsightFixtureTestCaseBase() {
 
     fun testAddCustomUsagesForKotlin() {
-//        TODO("[VD] There are diff API for ExtensionTestUtil in 191, 192, 193")
-//        val customUsageSearcher = object : CustomUsageSearcher() {
-//            override fun processElementUsages(element: PsiElement, processor: Processor<Usage>, options: FindUsagesOptions) {
-//                runReadAction { processor.process(UsageInfo2UsageAdapter(UsageInfo(element))) }
-//            }
-//        }
-//        // ExtensionTestUtil.maskExtensions(CustomUsageSearcher.EP_NAME, listOf(customUsageSearcher), testRootDisposable)
-//        myFixture.configureByText(KotlinFileType.INSTANCE, """val <caret>selfUsed = 1""")
-//
-//        val usages = myFixture.getUsageViewTreeTextRepresentation(myFixture.elementAtCaret)
-//        assertTrue(usages.contains("val selfUsed"))
+        val customUsageSearcher = object : CustomUsageSearcher() {
+            override fun processElementUsages(element: PsiElement, processor: ProcessorInCompat<Usage>, options: FindUsagesOptions) {
+                runReadAction { processor.process(UsageInfo2UsageAdapter(UsageInfo(element))) }
+            }
+        }
+        maskExtensions(CustomUsageSearcher.EP_NAME, listOf(customUsageSearcher), testRootDisposable)
+        myFixture.configureByText(KotlinFileType.INSTANCE, """val <caret>selfUsed = 1""")
+
+        val usages = myFixture.getUsageViewTreeTextRepresentation(myFixture.elementAtCaret)
+        assertTrue(usages.contains("val selfUsed"))
     }
 }
\ No newline at end of file
diff --git a/idea/tests/org/jetbrains/kotlin/findUsages/customUsageSearcher.kt b/idea/tests/org/jetbrains/kotlin/findUsages/customUsageSearcher.kt
new file mode 100644
index 00000000000..05056d4dccf
--- /dev/null
+++ b/idea/tests/org/jetbrains/kotlin/findUsages/customUsageSearcher.kt
@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.findUsages
+
+import com.intellij.util.Processor
+
+// BUNCH 193
+typealias ProcessorInCompat<T> = Processor<T>
\ No newline at end of file
diff --git a/idea/tests/org/jetbrains/kotlin/findUsages/customUsageSearcher.kt.201 b/idea/tests/org/jetbrains/kotlin/findUsages/customUsageSearcher.kt.201
new file mode 100644
index 00000000000..8c02c468a9c
--- /dev/null
+++ b/idea/tests/org/jetbrains/kotlin/findUsages/customUsageSearcher.kt.201
@@ -0,0 +1,11 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.findUsages
+
+import com.intellij.util.Processor
+
+// BUNCH 201
+typealias ProcessorInCompat<T> = Processor<in T>
\ No newline at end of file
diff --git a/idea/tests/org/jetbrains/kotlin/idea/compat.kt b/idea/tests/org/jetbrains/kotlin/idea/compat.kt
index 7b310c7a152..e4d67c2312f 100644
--- a/idea/tests/org/jetbrains/kotlin/idea/compat.kt
+++ b/idea/tests/org/jetbrains/kotlin/idea/compat.kt
@@ -6,7 +6,10 @@
 package org.jetbrains.kotlin.idea
 
 import com.intellij.ide.hierarchy.HierarchyTreeStructure
+import com.intellij.openapi.Disposable
+import com.intellij.openapi.extensions.ExtensionPointName
 import com.intellij.openapi.util.Computable
+import com.intellij.testFramework.ExtensionTestUtil
 import com.intellij.testFramework.codeInsight.hierarchy.HierarchyViewTestFixture
 
 // BUNCH: 193
@@ -18,3 +21,11 @@ fun doHierarchyTestCompat(
 ) {
     HierarchyViewTestFixture.doHierarchyTest(treeStructureComputable.compute(), expectedStructure)
 }
+
+fun <T> maskExtensions(
+    pointName: ExtensionPointName<T>,
+    newExtensions: List<T>,
+    parentDisposable: Disposable
+) {
+    ExtensionTestUtil.maskExtensions(pointName, newExtensions, parentDisposable)
+}
\ No newline at end of file
diff --git a/idea/tests/org/jetbrains/kotlin/idea/compat.kt.192 b/idea/tests/org/jetbrains/kotlin/idea/compat.kt.192
index 0ef6f5408ca..3cf24901394 100644
--- a/idea/tests/org/jetbrains/kotlin/idea/compat.kt.192
+++ b/idea/tests/org/jetbrains/kotlin/idea/compat.kt.192
@@ -6,10 +6,13 @@
 package org.jetbrains.kotlin.idea
 
 import com.intellij.ide.hierarchy.HierarchyTreeStructure
+import com.intellij.openapi.Disposable
+import com.intellij.openapi.extensions.ExtensionPointName
 import com.intellij.openapi.util.Computable
+import com.intellij.testFramework.PlatformTestUtil
 import com.intellij.testFramework.codeInsight.hierarchy.HierarchyViewTestFixture
 
-// BUNCH: 193
+// BUNCH: 192
 @Suppress("UNUSED_PARAMETER")
 fun doHierarchyTestCompat(
     hierarchyFixture: HierarchyViewTestFixture,
@@ -18,3 +21,11 @@ fun doHierarchyTestCompat(
 ) {
     hierarchyFixture.doHierarchyTest(treeStructureComputable.compute(), expectedStructure)
 }
+
+fun <T> maskExtensions(
+    pointName: ExtensionPointName<T>,
+    newExtensions: List<T>,
+    parentDisposable: Disposable
+) {
+    PlatformTestUtil.maskExtensions(pointName, newExtensions, parentDisposable)
+}
\ No newline at end of file