Add unit test for itoa

Author: hlovdal

SampleProjects/TestSomething/test/stdlib.cpp

@@ -0,0 +1,46 @@
+#include <ArduinoUnitTests.h>
+#include <Arduino.h>
+
+#define ARRAY_SIZEOF(a) ( sizeof(a) / sizeof((a)[0]) )
+
+unittest(library_tests_itoa)
+{
+  char buf[32];
+  const char *result;
+  struct {
+    int value;
+    const char *expected;
+    int base;
+  } table[] = {
+    { 54325, "1101010000110101", 2 },
+    { 54325, "54325", 10 },
+    { 54325, "D435", 16 },
+    { 493, "755", 8 },
+    { -1, "-1", 10 },
+    { 32767, "32767", 10},
+    { 32767, "7FFF", 16},
+    { 65535, "65535", 10},
+    { 65535, "FFFF", 16},
+    { 2147483647, "2147483647", 10},
+    { 2147483647, "7FFFFFFF", 16},
+  };
+
+  for (int i = 0; i < ARRAY_SIZEOF(table); i++) {
+    result = itoa(table[i].value, buf, table[i].base);
+    assertEqual(table[i].expected, result);
+  }
+
+  // While only bases 2, 8, 10 and 16 are of real interest, lets test that all
+  // bases at least produce expected output for a few test points simple to test.
+  for (int base = 2; base <= 16; base++) {
+    result = itoa(0, buf, base);
+    assertEqual("0", result);
+    result = itoa(1, buf, base);
+    assertEqual("1", result);
+    result = itoa(base, buf, base);
+    assertEqual("10", result);
+  }
+
+}
+
+unittest_main()