Add multi-file completion handler tests for FIR code completion

This is a temporary (and dirty) solution to start using those tests as
fast as possible. We certainly need to refactor them so they can be
generated from the testData

idea/idea-completion/testData/handlers/multifile/ClassWithClassObject-1.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 fun foo() {
     KtCla<caret>
 }

idea/idea-completion/testData/handlers/multifile/ClassWithClassObject.kt.after

@@ -1,5 +1,6 @@
 import pack.KtClass
 
+// FIR_COMPARISON
 fun foo() {
     KtClass<caret>
 }

idea/idea-completion/testData/handlers/multifile/FileRefInStringLiteralEnter-1.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 fun foo() {
     val s = "fo<caret>something"
 }

idea/idea-completion/testData/handlers/multifile/FileRefInStringLiteralEnter.kt.after

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 fun foo() {
     val s = "foo.txtsomething"
 }

idea/idea-completion/testData/handlers/multifile/FileRefInStringLiteralTab-1.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 fun foo() {
     val s = "fo<caret>something"
 }

idea/idea-completion/testData/handlers/multifile/FileRefInStringLiteralTab.kt.after

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 fun foo() {
     val s = "foo.txt"
 }

idea/idea-completion/testData/handlers/multifile/GlobalFunctionImportInLambda-1.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 object XXX {
     fun authorize(handler: String.() -> Unit) { }
 }

idea/idea-completion/testData/handlers/multifile/GlobalFunctionImportInLambda.kt.after

@@ -1,5 +1,6 @@
 import ppp.globalFun
 
+// FIR_COMPARISON
 object XXX {
     fun authorize(handler: String.() -> Unit) { }
 }

idea/idea-completion/testData/handlers/multifile/ImportAlreadyImportedObject-1.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package some
 
 import test.SomeTestObject

idea/idea-completion/testData/handlers/multifile/ImportAlreadyImportedObject.kt.after

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package some
 
 import test.SomeTestObject

idea/idea-completion/testData/handlers/multifile/JetClassCompletionImport-1.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package classimporttest
 
 fun test() {

idea/idea-completion/testData/handlers/multifile/JetClassCompletionImport.kt.after

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package classimporttest
 
 import forimport.TTTest

idea/idea-completion/testData/handlers/multifile/PropertyFunctionConflict-1.kt

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package a
 
 class Goo {

idea/idea-completion/testData/handlers/multifile/PropertyFunctionConflict.kt.after

@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package a
 
 import a.b.foo

idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/handlers/CompletionMultifileHandlerTest.kt

@@ -17,7 +17,7 @@ import org.junit.runner.RunWith
 import java.io.File
 
 @RunWith(JUnit3WithIdeaConfigurationRunner::class)
-class CompletionMultiFileHandlerTest : KotlinFixtureCompletionBaseTestCase() {
+open class CompletionMultiFileHandlerTest : KotlinFixtureCompletionBaseTestCase() {
     fun testExtensionFunctionImport() {
         doTest()
     }
@@ -118,8 +118,11 @@ class CompletionMultiFileHandlerTest : KotlinFixtureCompletionBaseTestCase() {
         doTest()
     }
 
-    fun doTest(completionChar: Char = '\n', vararg extraFileNames: String, tailText: String? = null) {
-        val fileName = getTestName(false)
+    private fun doTest(completionChar: Char = '\n', vararg extraFileNames: String, tailText: String? = null) {
+        doTest(getTestName(false), completionChar, extraFileNames, tailText)
+    }
+
+    open fun doTest(fileName: String, completionChar: Char, extraFileNames: Array<out String>, tailText: String?) {
 
         val defaultFiles = listOf("$fileName-1.kt", "$fileName-2.kt")
         val filteredFiles = defaultFiles.filter { File(testDataPath, it).exists() }

idea/idea-fir/tests/org/jetbrains/kotlin/idea/completion/test/handlers/HighLevelCompletionMultifileHandlerTest.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2010-2019 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.idea.completion.test.handlers
+
+import com.intellij.testFramework.LightProjectDescriptor
+import org.jetbrains.kotlin.idea.test.KotlinWithJdkAndRuntimeLightProjectDescriptor
+import org.jetbrains.kotlin.test.JUnit3WithIdeaConfigurationRunner
+import org.jetbrains.kotlin.test.uitls.IgnoreTests
+import org.junit.runner.RunWith
+import java.nio.file.Paths
+
+@RunWith(JUnit3WithIdeaConfigurationRunner::class)
+class HighLevelCompletionMultifileHandlerTest : CompletionMultiFileHandlerTest() {
+
+    /**
+     * This is a temporary solution! This test should be rewritten to be generated!
+     */
+    override fun doTest(fileName: String, completionChar: Char, extraFileNames: Array<out String>, tailText: String?) {
+        val testFile = Paths.get(testDataPath, "$fileName-1.kt")
+
+        IgnoreTests.runTestIfEnabledByFileDirective(testFile, IgnoreTests.DIRECTIVES.FIR_COMPARISON) {
+            super.doTest(fileName, completionChar, extraFileNames, tailText)
+        }
+    }
+
+    override val captureExceptions: Boolean = false
+
+    override fun getProjectDescriptor(): LightProjectDescriptor = KotlinWithJdkAndRuntimeLightProjectDescriptor.INSTANCE
+}