Adding test code for Print::availableForWrite

Author: aentinger

test/CMakeLists.txt

@@ -39,6 +39,7 @@ set(TEST_SRCS
   src/Print/test_getWriteError.cpp
   src/Print/test_print.cpp
   src/Print/test_println.cpp
+  src/Print/test_availableForWrite.cpp
   src/Ringbuffer/test_available.cpp
   src/Ringbuffer/test_availableForStore.cpp
   src/Ringbuffer/test_clear.cpp

test/src/Print/test_availableForWrite.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2020 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <Print.h>
+
+#include <PrintMock.h>
+
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+TEST_CASE ("Print::availableForWrite() should return 0 if not overwritten by derived class", "[Print-availableForWrite-01]")
+{
+  PrintMock mock;
+  REQUIRE(mock.availableForWrite() == 0);
+}