Enable assertions in Kotlin Compile Daemon process

#KT-32992 Fixed

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

@@ -734,7 +734,6 @@ abstract class BaseGradleIT {
 
             // Workaround: override a console type set in the user machine gradle.properties (since Gradle 4.3):
             add("--console=plain")
-            add("-Dkotlin.daemon.ea=true")
             addAll(options.freeCommandLineArgs)
         }
 

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

@@ -1,6 +1,5 @@
 package org.jetbrains.kotlin.gradle
 
-import org.gradle.util.GradleVersion
 import org.jetbrains.kotlin.gradle.util.checkedReplace
 import org.jetbrains.kotlin.gradle.util.getFileByName
 import org.jetbrains.kotlin.gradle.util.modify
@@ -66,23 +65,14 @@ abstract class ExecutionStrategyIT : BaseGradleIT() {
         val strategyCLIArg = "-Dkotlin.compiler.execution.strategy=$executionStrategy"
         val finishMessage = "Finished executing kotlin compiler using $executionStrategy strategy"
 
-        val isGradleAtLeast50 = project.testGradleVersionAtLeast("5.0")
-
         project.build("build", strategyCLIArg) {
             assertSuccessful()
             assertContains(finishMessage)
             checkOutput()
             assertNoWarnings()
 
-            if (executionStrategy == "daemon" && isGradleAtLeast50) {
-                val m = "Kotlin compile daemon JVM options: \\[(.*?)\\]".toRegex().find(output)
-                    ?: error("Could not find Kotlin compile daemon JVM options in Gradle's output")
-                val kotlinDaemonJvmArgs = m.groupValues[1].split(",").map { it.trim() }
-                val maxMetaspaceArg = "-XX:MaxMetaspaceSize=256m"
-                Assert.assertTrue(
-                    "Kotlin daemon JVM args do not contain '$maxMetaspaceArg': $kotlinDaemonJvmArgs",
-                    maxMetaspaceArg in kotlinDaemonJvmArgs
-                )
+            if (executionStrategy == "daemon") {
+                checkCompileDaemon()
             }
         }
 
@@ -98,6 +88,28 @@ abstract class ExecutionStrategyIT : BaseGradleIT() {
         }
     }
 
+    private fun CompiledProject.checkCompileDaemon() {
+        val isGradleAtLeast50 = project.testGradleVersionAtLeast("5.0")
+
+        val m = "Kotlin compile daemon JVM options: \\[(.*?)\\]".toRegex().find(output)
+            ?: error("Could not find Kotlin compile daemon JVM options in Gradle's output")
+        val kotlinDaemonJvmArgs = m.groupValues[1].split(",").mapTo(LinkedHashSet()) { it.trim() }
+
+        fun assertDaemonArgsContain(arg: String) {
+            Assert.assertTrue(
+                "Expected '$arg' in kotlin daemon JVM args, got: $kotlinDaemonJvmArgs",
+                arg in kotlinDaemonJvmArgs
+            )
+        }
+
+        if (isGradleAtLeast50) {
+            // 256m is the default value for Gradle 5.0+
+            assertDaemonArgsContain("-XX:MaxMetaspaceSize=256m")
+        }
+
+        assertDaemonArgsContain("-ea")
+    }
+
     protected open fun setupProject(project: Project) {
         project.setupWorkingDir()
         File(project.projectDir, "app/build.gradle").appendText(