Add test code for String::compareTo(...)

Author: giulcioffi

test/CMakeLists.txt

@@ -43,6 +43,7 @@ set(TEST_SRCS
   src/Ringbuffer/test_read_char.cpp
   src/Ringbuffer/test_store_char.cpp
   src/String/test_concat.cpp
+  src/String/test_compareTo.cpp
   src/String/test_indexOf.cpp
   src/String/test_lastIndexOf.cpp
   src/String/test_length.cpp

test/src/String/test_compareTo.cpp

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2020 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <String.h>
+
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+TEST_CASE ("Testing String::compareTo(const String &)", "[String-compareTo-01]")
+{
+  WHEN ("Strings are equal")
+  {
+    arduino::String str1("Hello"), str2("Hello");
+    REQUIRE(str1.compareTo(str2) == 0);
+  }
+
+  WHEN ("str2 is empty")
+  {
+    arduino::String str1("Hello"), str2;
+    REQUIRE(str1.compareTo(str2) == strcmp(str1.c_str(), str2.c_str()));
+  }
+
+  WHEN ("str1 is empty")
+  {
+    arduino::String str1, str2("Hello");
+    REQUIRE(str1.compareTo(str2) == strcmp(str1.c_str(), str2.c_str()));
+  }
+}
+
+TEST_CASE ("Testing String::compareTo(const char *)", "[String-compareTo-02]")
+{
+  WHEN ("Strings are equal")
+  {
+    arduino::String str("Hello");
+    REQUIRE(str.compareTo("Hello") == 0);
+  }
+
+  WHEN ("Passed string is empty")
+  {
+    arduino::String str1("Hello"), str2("");
+    REQUIRE(str1.compareTo("") == strcmp(str1.c_str(), str2.c_str()));
+  }
+
+  WHEN ("Passed string is compared with empty string")
+  {
+    arduino::String str1, str2("Hello");
+    REQUIRE(str1.compareTo("Hello") == strcmp(str1.c_str(), str2.c_str()));
+  }
+}