Modification trackers increment highlighting test

idea/tests/org/jetbrains/kotlin/idea/highlighter/HighlightingPerformanceTest.kt

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. 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.idea.highlighter
+
+import com.intellij.psi.PsiManager
+import com.intellij.psi.impl.PsiModificationTrackerImpl
+import com.intellij.testFramework.LightProjectDescriptor
+import com.intellij.testFramework.PlatformTestUtil
+import org.jetbrains.kotlin.idea.test.KotlinLightCodeInsightFixtureTestCase
+import org.jetbrains.kotlin.idea.test.KotlinWithJdkAndRuntimeLightProjectDescriptor
+
+class HighlightingPerformanceTest : KotlinLightCodeInsightFixtureTestCase() {
+    private val text = """
+        fun test(a: String, b: ArrayList<java.util.Date>) {
+            println(a + b)
+        }
+    """.trimIndent()
+
+    fun testModificationCountInc() {
+        myFixture.configureByText("temp.kt", text)
+        highlight()
+
+        val tracker = PsiManager.getInstance(myFixture.project).modificationTracker as PsiModificationTrackerImpl
+
+        PlatformTestUtil.assertTiming("Update local cache", 100) { // actual timing is ~55
+            tracker.modificationCount.inc()
+            highlight()
+        }
+    }
+
+    fun testOutOfBlockModificationCountInc() {
+        myFixture.configureByText("temp.kt", text)
+        highlight()
+
+        val tracker = PsiManager.getInstance(myFixture.project).modificationTracker as PsiModificationTrackerImpl
+
+        PlatformTestUtil.assertTiming("Update all trackers", 200) { // actual timing is ~165
+            tracker.incOutOfCodeBlockModificationCounter()
+            highlight()
+        }
+    }
+
+    override fun getProjectDescriptor(): LightProjectDescriptor = KotlinWithJdkAndRuntimeLightProjectDescriptor.INSTANCE_FULL_JDK
+
+    private fun highlight() {
+        myFixture.checkHighlighting(true, false, true)
+    }
+}