add test to check that "Only the Kotlin standard library is allowed to use the 'kotlin' package" is reported in JPS builds

jps-plugin/test/org/jetbrains/kotlin/jps/build/KotlinJpsBuildTest.kt

@@ -697,6 +697,16 @@ class KotlinJpsBuildTest : AbstractKotlinJpsBuildTestCase() {
         )
     }
 
+    fun testCodeInKotlinPackage() {
+        initProject()
+
+        val result = makeAll()
+        result.assertFailed()
+        val errors = result.getMessages(BuildMessage.Kind.ERROR)
+
+        Assert.assertEquals("Only the Kotlin standard library is allowed to use the 'kotlin' package", errors.single().messageText)
+    }
+
     fun testDoNotCreateUselessKotlinIncrementalCaches() {
         initProject()
         makeAll().assertSuccessful()

jps-plugin/testData/general/CodeInKotlinPackage/kotlinProject.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="IDEA_JDK" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module" module-name="kotlinProject" />
+  </component>
+</module>

jps-plugin/testData/general/CodeInKotlinPackage/kotlinProject.ipr

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <option name="DEFAULT_COMPILER" value="Javac" />
+  </component>
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/kotlinProject.iml" filepath="$PROJECT_DIR$/kotlinProject.iml" />
+    </modules>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_6" assert-keyword="true" jdk-15="true" project-jdk-name="IDEA_JDK" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

jps-plugin/testData/general/CodeInKotlinPackage/src/test1.kt

@@ -0,0 +1,5 @@
+package kotlin.forever
+
+fun foo() {
+
+}