Adding test code for String::replace(...)

Author: aentinger

test/CMakeLists.txt

@@ -44,6 +44,7 @@ set(TEST_SRCS
   src/Ringbuffer/test_store_char.cpp
   src/String/test_concat.cpp
   src/String/test_length.cpp
+  src/String/test_replace.cpp
   src/String/test_String.cpp
   src/String/test_toLowerCase.cpp
   src/String/test_toUpperCase.cpp

test/src/String/test_replace.cpp

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2020 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <String.h>
+
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+TEST_CASE ("Testing String::replace when string is empty", "[String-replace-01]")
+{
+  arduino::String str;
+  str.replace('a', 'b');
+  REQUIRE(str.length() == 0);
+}
+
+TEST_CASE ("Testing String::replace when string contains elements != 'find'", "[String-replace-02]")
+{
+  arduino::String str("Hello Arduino!");
+  str.replace('Z', '0');
+  REQUIRE(strcmp(str.c_str(), "Hello Arduino!") == 0);
+}
+
+TEST_CASE ("Testing String::replace when string contains elements = 'find'", "[String-replace-02]")
+{
+  arduino::String str("Hello Arduino!");
+  str.replace('o', '0');
+  str.replace('e', '3');
+  str.replace('i', '1');
+  REQUIRE(strcmp(str.c_str(), "H3ll0 Ardu1n0!") == 0);
+}