Add test that currently fails

In file included from /usr/include/stdio.h:33,
                 from /usr/include/c++/8/cstdio:42,
                 from /usr/include/c++/8/ext/string_conversions.h:43,
                 from /usr/include/c++/8/bits/basic_string.h:6400,
                 from /usr/include/c++/8/string:52,
                 from /usr/include/c++/8/stdexcept:39,
                 from .../arduino_ci/cpp/arduino/WString.h:4,
                 from .../arduino_ci/cpp/arduino/Arduino.h:13,
                 from .../arduino_ci/SampleProjects/DoSomething/do-something.cpp:1:
.../arduino_ci/SampleProjects/DoSomething/do-something.cpp: In function ‘const something* findSomething(int)’:
.../arduino_ci/cpp/arduino/Nullptr.h:5:31: error: invalid conversion from ‘my_nullptr_t’ {aka ‘void*’} to ‘const something*’ [-fpermissive]
 #define nullptr (my_nullptr_t)NULL
                               ^~~~
.../arduino_ci/SampleProjects/DoSomething/do-something.cpp:20:9: note: in expansion of macro ‘nullptr’
  return nullptr;
         ^~~~~~~

Author: hlovdal

SampleProjects/DoSomething/test/find-something.cpp

@@ -0,0 +1,21 @@
+#include <ArduinoUnitTests.h>
+
+#include "do-something.h"
+
+unittest(find_something_that_exists)
+{
+  const struct something *result;
+  result = findSomething(1);
+  assertNotNull(result);
+  assertEqual("abc", result->text);
+}
+
+unittest(find_something_that_does_not_exists)
+{
+  const struct something *result;
+  result = findSomething(1000);
+  assertNull(result);
+}
+
+unittest_main()
+