#993. More Struct tests added

LibTest/ffi/Struct/Struct_A01_t03.dart

@@ -11,6 +11,7 @@
  * @description Checks that it is a compile error if any of the field in Struct
  * subclass is not 'int', 'double' or 'Pointer' or subtype of 'Struct'
  * @author sgrekhov@unipro.ru
+ * @issue 44986
  */
 import "dart:ffi";
 
@@ -51,5 +52,4 @@ void main() {
   S2? s2;
   S3? s3;
   S4? s4;
-  S5? s5;
 }

LibTest/ffi/Struct/Struct_A01_t05.dart

@@ -11,6 +11,7 @@
  * @description Checks that it is a compile error if any of the field in Struct
  * subclass is not 'int', 'double' or 'Pointer' or subtype of 'Struct'
  * @author sgrekhov@unipro.ru
+ * @issue 44985
  */
 import "dart:ffi";
 

LibTest/ffi/Struct/Struct_A02_t01.dart

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2021, the Dart project authors.  Please see the AUTHORS file
+ * for details. All rights reserved. Use of this source code is governed by a
+ * BSD-style license that can be found in the LICENSE file.
+ */
+/**
+ * @assertion Struct()
+ *  Construct a reference to the nullptr.
+ *
+ * @description Checks that this constructor constructs a reference to the
+ * nullptr.
+ * @author sgrekhov@unipro.ru
+ * @issue 44987
+ */
+import "dart:ffi";
+import "../../../Utils/expect.dart";
+
+class S1 extends Struct {
+  S1() : super();
+}
+
+void main() {
+  S1 s1 = new S1();
+  Expect.equals(nullptr.address, s1.addressOf.address);
+}

LibTest/ffi/Struct/Struct_A03_t01.dart

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2021, the Dart project authors.  Please see the AUTHORS file
+ * for details. All rights reserved. Use of this source code is governed by a
+ * BSD-style license that can be found in the LICENSE file.
+ */
+/**
+ * @assertion Struct()
+ *  The supertype of all FFI struct types.
+ *
+ *  FFI struct types should extend this class and declare fields corresponding
+ *  to the underlying native structure.
+ *
+ * @description Checks that FFI struct types should extend this class and
+ * declare fields corresponding to the underlying native structure
+ * @author sgrekhov@unipro.ru
+ */
+import "dart:ffi";
+import "../ffi_utils.dart";
+import "../../../Utils/expect.dart";
+
+class Coord extends Struct {
+  @Double()
+  external double x;
+  @Double()
+  external double y;
+
+  external Pointer<Coord> next;
+}
+
+// Native C function
+typedef TransposeCoordinateCFunc = Pointer<Coord> Function(Pointer<Coord>);
+// Dart function
+typedef TransposeCoordinateDartFunc = Pointer<Coord> Function(Pointer<Coord>);
+
+void main() {
+  final dl = new DynamicLibrary.open(libPath(TEST_FUNCTIONS_LIB));
+  final TransposeCoordinateDartFunc f = dl
+      .lookup<NativeFunction<TransposeCoordinateCFunc>>('TransposeCoordinate')
+      .asFunction();
+  Pointer<Coord> c1 = calloc<Coord>();
+  try {
+    c1.ref.x = 1;
+    c1.ref.y = 2;
+    f(c1);
+    Expect.equals(11, c1.ref.x);
+    Expect.equals(12, c1.ref.y);
+  } finally {
+    calloc.free(c1);
+  }
+}

LibTest/ffi/Struct/Struct_A03_t02.dart

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2021, the Dart project authors.  Please see the AUTHORS file
+ * for details. All rights reserved. Use of this source code is governed by a
+ * BSD-style license that can be found in the LICENSE file.
+ */
+/**
+ * @assertion Struct()
+ *  The supertype of all FFI struct types.
+ *
+ *  FFI struct types should extend this class and declare fields corresponding
+ *  to the underlying native structure.
+ *
+ * @description Checks that FFI struct types should extend this class and
+ * declare fields corresponding to the underlying native structure. Test
+ * nullable Struct subtype members
+ * @author sgrekhov@unipro.ru
+ */
+import "dart:ffi";
+import "../ffi_utils.dart";
+import "../../../Utils/expect.dart";
+
+class Coord extends Struct {
+  Coord() : super();
+
+  @Double()
+  external double? x;
+  @Double()
+  external double? y;
+
+  external Pointer<Coord>? next;
+}
+
+// Native C function
+typedef TransposeCoordinateCFunc = Pointer<Coord> Function(Pointer<Coord>);
+// Dart function
+typedef TransposeCoordinateDartFunc = Pointer<Coord> Function(Pointer<Coord>);
+
+void main() {
+  final dl = new DynamicLibrary.open(libPath(TEST_FUNCTIONS_LIB));
+  final TransposeCoordinateDartFunc f = dl
+      .lookup<NativeFunction<TransposeCoordinateCFunc>>('TransposeCoordinate')
+      .asFunction();
+  Coord c = new Coord();
+  Pointer<Coord> c1 = calloc<Coord>();
+  try {
+    c1.ref.x = 1;
+    c1.ref.y = 2;
+    f(c1);
+    Expect.equals(11, c1.ref.x);
+    Expect.equals(12, c1.ref.y);
+  } finally {
+    calloc.free(c1);
+  }
+}