Add test for KT-20007

idea/testData/quickfix/implement/doNotAddExpectForVal.kt

@@ -0,0 +1,14 @@
+// "Implement members" "true"
+// ENABLE_MULTIPLATFORM
+// ERROR: Expected interface 'InterfaceWithVals' has no actual declaration in module light_idea_test_case for JVM
+
+fun TODO(s: String): Nothing = null!!
+
+expect interface InterfaceWithVals {
+    fun funInInterface()
+
+    val importantVal: Int
+}
+
+class <caret>ChildOfInterface : InterfaceWithVals{
+}