Initial commit that has most of what I need.

tests/dbc.cpp

@@ -0,0 +1,39 @@
+#include <catch2/catch_test_macros.hpp>
+#include "dbc.hpp"
+
+using namespace dbc;
+
+TEST_CASE("basic feature tests", "[utils]") {
+  log("Logging a message.");
+
+  try {
+    sentinel("This shouldn't happen.");
+  } catch(SentinelError) {
+    log("Sentinel happened.");
+  }
+
+  pre("confirm positive cases work", 1 == 1);
+  pre("confirm positive lambda", [&]{ return 1 == 1;});
+  post("confirm positive post", 1 == 1);
+  post("confirm postitive post with lamdba", [&]{ return 1 == 1;});
+
+  check(1 == 1, "one equals 1");
+
+  try {
+    check(1 == 2, "this should fail");
+  } catch(CheckError err) {
+    log("check fail worked");
+  }
+
+  try {
+    pre("failing pre", 1 == 3);
+  } catch(PreCondError err) {
+    log("pre fail worked");
+  }
+
+  try {
+    post("failing post", 1 == 4);
+  } catch(PostCondError err) {
+    log("post faile worked");
+  }
+}