Add testcases for isAscii

Author: facchinm

Diff for: test/CMakeLists.txt

@@ -81,6 +81,7 @@ set(TEST_SRCS
   src/String/test_toLowerCase.cpp
   src/String/test_toUpperCase.cpp
   src/String/test_trim.cpp
+  src/WCharacter/test_isAscii.cpp
   src/WCharacter/test_isControl.cpp
   src/WCharacter/test_isDigit.cpp
   src/WCharacter/test_isHexadecimalDigit.cpp

Diff for: test/src/WCharacter/test_isAscii.cpp

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2020 Arduino.  All rights reserved.
+ */
+
+/**************************************************************************************
+ * INCLUDE
+ **************************************************************************************/
+
+#include <catch.hpp>
+
+#include <vector>
+
+#include <WCharacter.h>
+
+/**************************************************************************************
+ * CONSTANTS
+ **************************************************************************************/
+
+std::vector<char> const VALID_ASCII_VECT = {' ', 'a', 'b', 'q', '\n', '\r'};
+
+/**************************************************************************************
+ * TEST CODE
+ **************************************************************************************/
+
+TEST_CASE ("isAscii(...) is called with a valid ascii character", "[isAscii-01]")
+{
+  std::for_each(std::begin(VALID_ASCII_VECT),
+                std::end  (VALID_ASCII_VECT),
+                [](char const c)
+                {
+                  REQUIRE(arduino::isAscii(c) == true);
+                });
+}
+
+TEST_CASE ("isAscii(...) is called with a invalid ascii character", "[isAscii-02]")
+{
+  REQUIRE(arduino::isAscii(0xf7) == false);
+}
+
+TEST_CASE ("isAscii(...) is called with a invalid casted ascii character", "[isAscii-03]")
+{
+  REQUIRE(arduino::isAscii((unsigned char)0xf7) == false);
+}
+
+TEST_CASE ("isAscii(...) is called with a character latger than 1 byte", "[isAscii-04]")
+{
+  REQUIRE(arduino::isAscii(0x3030) == false);
+}
+