Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/builtinStubMethods/extendJavaCollections.kt

@@ -1,3 +1,5 @@
+// FILE: Test.java
+
 import java.lang.*;
 import java.util.*;
 
@@ -8,3 +10,19 @@ public class Test {
         public String setValue(String s) { return null; }
     }
 }
+
+// FILE: main.kt
+
+//class MyIterable : Test.IterableImpl()
+//class MyIterator : Test.IteratorImpl()
+class MyMapEntry : Test.MapEntryImpl()
+
+fun box(): String {
+
+    val b = MyMapEntry()
+    b.key
+    b.value
+    b.setValue(null)
+
+    return "OK"
+}

compiler/testData/codegen/boxWithJava/builtinStubMethods/extendJavaCollections/extendJavaCollections.kt

@@ -1,13 +0,0 @@
-//class MyIterable : Test.IterableImpl()
-//class MyIterator : Test.IteratorImpl()
-class MyMapEntry : Test.MapEntryImpl()
-
-fun box(): String {
-
-    val b = MyMapEntry()
-    b.key
-    b.value
-    b.setValue(null)
-
-    return "OK"
-}

compiler/testData/codegen/boxWithJava/builtinStubMethods/substitutedIterable.kt

@@ -1,3 +1,16 @@
+// FILE: Test.java
+
+public class Test {
+    public static void checkCallFromJava() {
+        try {
+            String x = TestKt.foo().iterator().next();
+            throw new AssertionError("E should have been thrown");
+        } catch (E e) { }
+    }
+}
+
+// FILE: test.kt
+
 interface MyIterable<T> : Iterable<T>
 
 class E : RuntimeException()

compiler/testData/codegen/boxWithJava/builtinStubMethods/substitutedIterable/Test.java

@@ -1,8 +0,0 @@
-public class Test {
-    public static void checkCallFromJava() {
-        try {
-            String x = SubstitutedIterableKt.foo().iterator().next();
-            throw new AssertionError("E should have been thrown");
-        } catch (E e) { }
-    }
-}

compiler/testData/codegen/boxWithJava/builtinStubMethods/substitutedList.kt

@@ -1,3 +1,20 @@
+// FILE: Test.java
+
+class Test {
+    interface A {
+        boolean add(String s);
+    }
+
+    static class D extends C {}
+
+    void test() {
+        A a = new D();
+        a.add("lol");
+    }
+}
+
+// FILE: test.kt
+
 abstract class C : Test.A, List<String> {
     override val size: Int get() = null!!
     override fun isEmpty(): Boolean = null!!

compiler/testData/codegen/boxWithJava/builtinStubMethods/substitutedList/Test.java

@@ -1,12 +0,0 @@
-class Test {
-    interface A {
-        boolean add(String s);
-    }
-
-    static class D extends C {}
-
-    void test() {
-        A a = new D();
-        a.add("lol");
-    }
-}