Test: refactor Gradle daemon memory test

Currently the test makes more harm than use:
* It is too slow: two executions (with different Gradle versions)
take 5 minute on CI.
* It is unreliable: the test fails on CI for months
with insignificant violation of the memory growth limit.

After this change:
* the memory growth limit is increased;
* the test run count is decreased;
* changes the test to use separate project with minimal amount of classes
(we're not interested in compiler's memory leaks; only Gradle plugin specific ones);

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/GradleDaemonMemoryIT.kt

@@ -14,11 +14,11 @@ class GradleDaemonMemoryIT : BaseGradleIT() {
     // In order to stop daemon process, special exit task is used ( System.exit(0) ).
     @Test
     fun testGradleDaemonMemory() {
-        val project = Project("kotlinProject")
+        val project = Project("gradleDaemonMemory")
         val VARIANT_CONSTANT = "ForTest"
         val userVariantArg = "-Duser.variant=$VARIANT_CONSTANT"
-        val MEMORY_MAX_GROWTH_LIMIT_KB = 500
-        val BUILD_COUNT = 15
+        val MEMORY_MAX_GROWTH_LIMIT_KB = 5000
+        val BUILD_COUNT = 10
         val reportMemoryUsage = "-Dkotlin.gradle.test.report.memory.usage=true"
         val options = BaseGradleIT.BuildOptions(withDaemon = true)
 
@@ -32,10 +32,11 @@ class GradleDaemonMemoryIT : BaseGradleIT() {
         fun buildAndGetMemoryAfterBuild(): Int {
             var reportedMemory: Int? = null
 
-            project.build(userVariantArg, reportMemoryUsage, "clean", "build", options = options) {
+            project.build(userVariantArg, reportMemoryUsage, "clean", "assemble", options = options) {
                 assertSuccessful()
                 val matches = "\\[KOTLIN\\]\\[PERF\\] Used memory after build: (\\d+) kb \\(difference since build start: ([+-]?\\d+) kb\\)"
                     .toRegex().find(output)
+                assertTasksExecuted(":compileKotlin")
                 assert(matches != null && matches.groups.size == 3) { "Used memory after build is not reported by plugin" }
                 reportedMemory = matches!!.groupValues[1].toInt()
             }

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/gradleDaemonMemory/build.gradle

@@ -0,0 +1,24 @@
+buildscript {
+    repositories {
+        mavenLocal()
+        mavenCentral()
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+apply plugin: "kotlin"
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+}
+
+dependencies {
+    compile "org.jetbrains.kotlin:kotlin-runtime:$kotlin_version"
+}
+
+task exit << {
+    System.exit(0)
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/gradleDaemonMemory/gradle.properties

@@ -0,0 +1 @@
+org.gradle.jvmargs=-Xmx1024m -XX:MaxPermSize=512m

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/gradleDaemonMemory/src/main/kotlin/Dummy.kt

@@ -0,0 +1,6 @@
+/*
+ * 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.
+ */
+
+class Dummy

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/kotlinProject/build.gradle

@@ -24,7 +24,3 @@ dependencies {
 test {
     useTestNG()
 }
-
-task exit << {
-    System.exit(0)
-}