first commit

test/test_utils.cpp

@@ -0,0 +1,10 @@
+#include <cstdlib>
+#include <iostream>
+
+void test_(bool expr, const char *text, const char *file, int line)
+{
+    if (!expr) {
+        std::cout << "Failure in " << file << ":" << line << " [" << text << "]\n";
+        abort();
+    }
+}