license: add SPDX-License-Identifier to all files in test/

The files in the test/ folder had a copyright notice, but no license
information. This commit adds the LGPL-2.1-or-later SPDX license
identifier to all these files.

Author: pillo79

test/CMakeLists.txt

@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
 ##########################################################################
 
 cmake_minimum_required(VERSION 2.8)

test/include/MillisFake.h

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #ifndef MILLIS_FAKE_H_

test/include/PrintMock.h

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #ifndef PRINT_MOCK_H_

test/include/PrintableMock.h

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #ifndef PRINTABLE_MOCK_H_

test/include/StreamMock.h

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #ifndef STREAM_MOCK_H_

test/src/CanMsg/test_CanExtendedId.cpp

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 /**************************************************************************************

test/src/CanMsg/test_CanMsg.cpp

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 /**************************************************************************************

test/src/CanMsg/test_CanMsg_CopyCtor.cpp

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 /**************************************************************************************

test/src/CanMsg/test_CanStandardId.cpp

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 /**************************************************************************************

test/src/CanMsg/test_isExtendedId.cpp

@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2020 Arduino.  All rights reserved.
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 /**************************************************************************************