gcd : Added unit test and Makefile target

gcd/src/gcd_test.cpp

@@ -0,0 +1,37 @@
+#include <iostream>
+#include <cassert>
+#include "gcd.hpp"
+
+/**
+ * @brief Test if a given result is equal of the expected one and log result
+ *
+ * @param name of the unit test
+ * @param expected result of the function call
+ * @param result of the function
+ */
+static void Assert(const char* const name, const uint64_t expected, const uint64_t result) noexcept {
+	if(expected != result){
+		std::cerr << "For test named " << name << " Expected '" << expected << "' but got '" << result << "' instead\n";
+	}
+}
+
+/**
+ * @brief Test suite for the gcd output
+ */
+void gcd_test(void) noexcept {
+	Assert("gcd null LR",      0,      gcd(0,      0));
+	Assert("gcd null L",       196883, gcd(196883, 0));
+	Assert("gcd null R",       196883, gcd(0,      196883));
+	Assert("gcd self",         196883, gcd(196883, 196883));
+	Assert("gcd Full HD",      120,    gcd(1920,   1080));
+	Assert("gcd monsterfel",   2773,   gcd(196883, 194110));
+	Assert("gcd monsterfel 2", 2773,   gcd(194110, 196883));
+	Assert("gcd monsterful",   4189,   gcd(196883, 192694));
+	Assert("gcd monsterful 2", 4189,   gcd(192694, 196883));
+}
+
+int32_t main(void){
+	setlocale(LC_NUMERIC, ""); // Allow proper number display
+	gcd_test();
+	return EXIT_SUCCESS;
+}