JUnit Support: Allow running multiple Kotlin classes as well as running mixtures of Kotlin and Java classes

#KT-11155 Fixed

ChangeLog.md

@@ -14,6 +14,7 @@
 Issues fixed:
 
 - [KT-11145](https://youtrack.jetbrains.com/issue/KT-11145) Use progress indicator when searching usages in Introduce Parameter
+- [KT-11155](https://youtrack.jetbrains.com/issue/KT-11155) Allow running multiple Kotlin classes as well as running mixtures of Kotlin and Java classes
 
 #### Debugger
 

idea/src/META-INF/junit.xml

@@ -1,5 +1,6 @@
 <idea-plugin>
   <extensions defaultExtensionNs="com.intellij">
     <runConfigurationProducer implementation="org.jetbrains.kotlin.idea.run.KotlinJUnitRunConfigurationProducer"/>
+    <runConfigurationProducer implementation="org.jetbrains.kotlin.idea.run.KotlinPatternConfigurationProducer"/>
   </extensions>
 </idea-plugin>

idea/src/org/jetbrains/kotlin/idea/run/KotlinPatternConfigurationProducer.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2010-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.run
+
+import com.intellij.execution.actions.ConfigurationContext
+import com.intellij.execution.actions.ConfigurationFromContext
+import com.intellij.execution.junit.JUnitConfiguration
+import com.intellij.execution.junit.PatternConfigurationProducer
+import com.intellij.execution.junit.TestClassConfigurationProducer
+import com.intellij.openapi.util.Ref
+import com.intellij.psi.PsiElement
+import com.intellij.psi.search.PsiElementProcessor
+import org.jetbrains.kotlin.asJava.toLightClass
+import org.jetbrains.kotlin.psi.KtClassOrObject
+
+class KotlinPatternConfigurationProducer : PatternConfigurationProducer() {
+    override fun setupConfigurationFromContext(
+            configuration: JUnitConfiguration,
+            context: ConfigurationContext,
+            sourceElement: Ref<PsiElement>
+    ): Boolean {
+        return super.setupConfigurationFromContext(configuration, context, sourceElement)
+    }
+
+    override fun collectTestMembers(
+            psiElements: Array<out PsiElement>,
+            checkAbstract: Boolean,
+            checkIsTest: Boolean,
+            collectingProcessor: PsiElementProcessor.CollectElements<PsiElement>
+    ) {
+        val adjustedElements = psiElements.mapNotNull { if (it is KtClassOrObject) it.toLightClass() else it }.toTypedArray()
+        super.collectTestMembers(adjustedElements, checkAbstract, checkIsTest, collectingProcessor)
+    }
+
+    override fun shouldReplace(self: ConfigurationFromContext, other: ConfigurationFromContext): Boolean {
+        return other.isProducedBy(PatternConfigurationProducer::class.java)
+               || other.isProducedBy(TestClassConfigurationProducer::class.java)
+               || other.isProducedBy(KotlinJUnitRunConfigurationProducer::class.java)
+    }
+}