Adding test code for Stream::readString

Author: aentinger

test/src/Stream/test_readString.cpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2020 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <MillisFake.h>
+#include <StreamMock.h>
+#include <iostream>
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+TEST_CASE ("Testing 'readString' with data available within the stream", "[Stream-readString-01]")
+{
+  StreamMock mock;
+  mock.setTimeout(10);
+  millis_autoOn();
+  mock << "This is test stream content";
+
+  REQUIRE(mock.readString() == arduino::String("This is test stream content"));
+}