Add unit test for String::isEmpty()

Author: alranel

test/src/String/test_isEmpty.cpp

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2023 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <api/String.h>
+
+#include "StringPrinter.h"
+
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+TEST_CASE ("Testing String::isEmpty when string is empty", "[String-isEmpty-01]")
+{
+  arduino::String str;
+  REQUIRE(str.isEmpty());
+}
+
+TEST_CASE ("Testing String::isEmpty when string contains characters", "[String-isEmpty-02]")
+{
+  arduino::String str("Testing String::isEmpty");
+  REQUIRE(!str.isEmpty());
+}