Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/java8/box/reflection/realParameterNames.kt

@@ -0,0 +1,24 @@
+// FILE: J.java
+
+public class J {
+    public J(String constructorParam) {}
+
+    public static void foo(int methodParam) {}
+}
+
+// FILE: K.kt
+// JAVAC_OPTIONS: -parameters
+
+import kotlin.test.assertEquals
+
+fun box(): String {
+    val methodParam = J::foo.parameters.single()
+    if (methodParam.name == null) return "Fail: method parameter has no name"
+    assertEquals("methodParam", methodParam.name)
+
+    val constructorParam = J::class.constructors.single().parameters.single()
+    if (constructorParam.name == null) return "Fail: constructor parameter has no name"
+    assertEquals("constructorParam", constructorParam.name)
+
+    return "OK"
+}

compiler/testData/codegen/java8/box/reflection/synthesizedParameterNames.kt

@@ -0,0 +1,23 @@
+// FILE: J.java
+
+public class J {
+    public J(String constructorParam) {}
+
+    public static void foo(int methodParam) {}
+}
+
+// FILE: K.kt
+
+import kotlin.test.assertEquals
+
+fun box(): String {
+    val methodParam = J::foo.parameters.single()
+    if (methodParam.name == null) return "Fail: method parameter has no name"
+    assertEquals("arg0", methodParam.name)
+
+    val constructorParam = J::class.constructors.single().parameters.single()
+    if (constructorParam.name == null) return "Fail: constructor parameter has no name"
+    assertEquals("arg0", constructorParam.name)
+
+    return "OK"
+}