Fixed up the tests.

Makefile.am

@@ -15,7 +15,7 @@ roverif_elf_LDADD = libnppilot.a
 check_PROGRAMS = \
 	tests/runner
 
-tests_runner_LDADD = libnppilot.a
+tests_runner_LDADD = libnppilot.a -lstdc++
 
 lib_LIBRARIES = \
 	libnppilot.a \

lib/debug.cc

@@ -54,6 +54,9 @@ void Debug::vprint(const char* pmsg, va_list args)
             case 'x':
                 printn(va_arg(args, int), 16, false);
                 break;
+            case 's':
+                print(va_arg(args, char *));
+                break;
             default:
                 assert(false);
                 break;

tests/test_debug.h

@@ -0,0 +1,55 @@
+#include <debug.h>
+#include <cxxtest/TestSuite.h>
+
+class TestDebug : public CxxTest::TestSuite
+{
+public:
+    void setUp()
+    {
+        _at = 0;
+    }
+
+    void test_basic()
+    {
+        Debug::info("rock on!");
+        TS_ASSERT_EQUALS(0, strcmp("info: rock on!\r\n", _msg));
+    }
+
+    void test_signed()
+    {
+        Debug::info("decimal %d.", -1234);
+        TS_ASSERT_EQUALS(0, strcmp("info: decimal -1234.\r\n", _msg));
+    }
+
+    void test_unsigned()
+    {
+        Debug::info("unsigned %u.", -1234);
+        TS_ASSERT_EQUALS(0, strcmp("info: unsigned 4294966062.\r\n", _msg));
+    }
+
+    void test_hex()
+    {
+        Debug::info("hex %x.", 0xabcd5678);
+        TS_ASSERT_EQUALS(0, strcmp("info: hex abcd5678.\r\n", _msg));
+    }
+
+    void test_string()
+    {
+        Debug::info("str %s.", "rock on!");
+        TS_ASSERT_EQUALS(0, strcmp("info: str rock on!.\r\n", _msg));
+    }
+
+    static int _at;
+    static char _msg[128];
+};
+
+void Debug::putch(char ch)
+{
+    TestDebug::_msg[TestDebug::_at++] = ch;
+    TestDebug::_msg[TestDebug::_at] = '\0';
+}
+
+#ifdef CXXTEST_RUNNING
+int TestDebug::_at;
+char TestDebug::_msg[128];
+#endif