From 0fe488b1c27cd66c91c8e37317a43c644ab7516a Mon Sep 17 00:00:00 2001
From: Deukhoofd <deukhoofd@gmail.com>
Date: Sun, 22 Mar 2020 11:14:47 +0100
Subject: [PATCH] Implements Assert macro.

---
 src/Assert.hpp        | 24 ++++++++++++++++++++++++
 tests/AssertTests.cpp | 14 ++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 src/Assert.hpp
 create mode 100644 tests/AssertTests.cpp

diff --git a/src/Assert.hpp b/src/Assert.hpp
new file mode 100644
index 0000000..12d568a
--- /dev/null
+++ b/src/Assert.hpp
@@ -0,0 +1,24 @@
+#ifndef ARBUTILS_ASSERT_HPP
+#define ARBUTILS_ASSERT_HPP
+#include <sstream>
+#include <stdexcept>
+#include <string.h>
+
+#define __FILENAME__ (strrchr(__FILE__, '/') ? strrchr(__FILE__, '/') + 1 : __FILE__)
+
+#ifndef NO_ASSERT
+#define Assert(expr)                                                                                                   \
+    {                                                                                                                  \
+        if (!expr) {                                                                                                   \
+            std::stringstream ss;                                                                                      \
+            ss << "ASSERTION FAILED: [" << __FILENAME__ << " (" << __LINE__ << ")] \"";                                \
+            ss << #expr << "\"";                                                                                       \
+            throw std::logic_error(ss.str());                                                                          \
+        }                                                                                                              \
+    }
+#else
+// Assert is empty if NO_ASSERT is defined.
+#define Assert(expr)
+#endif
+
+#endif
\ No newline at end of file
diff --git a/tests/AssertTests.cpp b/tests/AssertTests.cpp
new file mode 100644
index 0000000..bbac7f8
--- /dev/null
+++ b/tests/AssertTests.cpp
@@ -0,0 +1,14 @@
+#include "../extern/catch.hpp"
+#include "../src/Assert.hpp"
+void TestWrapper(bool wrapperExpression){Assert(wrapperExpression)}
+
+TEST_CASE("Assert succeeds if true", "[Utilities]") {
+    REQUIRE_NOTHROW(TestWrapper(true));
+}
+
+TEST_CASE("Assert throws if false", "[Utilities]") { REQUIRE_THROWS(TestWrapper(false)); }
+
+TEST_CASE("Assert throws if false with message", "[Utilities]") {
+    REQUIRE_THROWS_WITH(TestWrapper(false),
+                        Catch::Matchers::Equals("ASSERTION FAILED: [AssertTests.cpp (3)] \"wrapperExpression\""));
+}