implement KtFile.getClasses() in plugin (required to have coverage work, among other things)

idea/tests/org/jetbrains/kotlin/asJava/KtFileLightClassTest.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2010-2015 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.asJava
+
+import com.intellij.testFramework.LightProjectDescriptor
+import org.jetbrains.kotlin.idea.test.KotlinLightCodeInsightFixtureTestCase
+import org.jetbrains.kotlin.idea.test.KotlinLightProjectDescriptor
+import org.jetbrains.kotlin.psi.KtFile
+
+class KtFileLightClassTest : KotlinLightCodeInsightFixtureTestCase() {
+    override fun getProjectDescriptor(): LightProjectDescriptor = KotlinLightProjectDescriptor.INSTANCE
+
+    fun testSimple() {
+        val file = myFixture.configureByText("A.kt", "class C {}\nobject O {}") as KtFile
+        val classes = file.classes
+        assertEquals(2, classes.size)
+        assertEquals("C", classes[0].qualifiedName)
+        assertEquals("O", classes[1].qualifiedName)
+    }
+
+    fun testFileClass() {
+        val file = myFixture.configureByText("A.kt", "fun f() {}") as KtFile
+        val classes = file.classes
+        assertEquals(1, classes.size)
+        assertEquals("AKt", classes[0].qualifiedName)
+    }
+}