[cxx-interop] test accessing fields of a move-only C++ type

Author: hyp

test/Interop/Cxx/class/move-only/Inputs/move-only-cxx-value-type.h

@@ -17,10 +17,18 @@ struct NonCopyable {
       x = y;
       return y;
     }
-private:
+
     int x;
 };
 
+struct NonCopyableDerived: public NonCopyable {
+    NonCopyableDerived(int x) : NonCopyable(x) {}
+};
+
+struct NonCopyableDerivedDerived: public NonCopyableDerived {
+    NonCopyableDerivedDerived(int x) : NonCopyableDerived(x) {}
+};
+
 struct NonCopyableHolder {
     inline NonCopyableHolder(int x) : x(x) {}
     inline NonCopyableHolder(const NonCopyableHolder &) = delete;

test/Interop/Cxx/class/move-only/move-only-cxx-value-type.swift

@@ -9,10 +9,28 @@ var MoveOnlyCxxValueType = TestSuite("Move Only Value Types")
 
 MoveOnlyCxxValueType.test("Test move only type member access") {
   var c = NonCopyable(2)
-  let k = c.method(-2)
+  var k = c.method(-2)
   expectEqual(k, -4)
   expectEqual(c.method(1), 2)
+  k = c.x
+  expectEqual(k, 2)
+  c.x = -3
+  expectEqual(c.x, -3)
+  k = c.mutMethod(72)
+  expectEqual(k, 72)
 }
 
-runAllTests()
+MoveOnlyCxxValueType.test("Test derived move only type member access") {
+  var c = NonCopyableDerivedDerived(2)
+  var k = c.method(-3)
+  expectEqual(k, -6)
+  expectEqual(c.method(1), 2)
+  k = c.x
+  expectEqual(k, 2)
+  c.x = 11
+  expectEqual(c.x, 11)
+  k = c.mutMethod(-13)
+  expectEqual(k, -13)
+}
 
+runAllTests()