test: add test for SquareRoot::of(2UL)

Author: Abega1642

tests/test_bench_marks.cpp

@@ -0,0 +1,38 @@
+#include <gtest/gtest.h>
+#include <chrono>
+#include "../include/SquareRoot.hpp"
+#include "../include/Fraction.hpp"
+
+
+/*
+* [Benchmark of SquareRoot::k_th_value]
+	 - nat			= 2,
+	 - k			= 22,
+	 - Precision	= 6000002 decimal digits,
+	 - Duration		= 7.79397 seconds
+ */
+
+TEST(SquareRootBenchmark, TimeExecutionOfKthValueComputation) {
+	constexpr unsigned long target = 2UL;
+	constexpr unsigned long k = 22UL;
+	constexpr std::size_t precision_digits = 6'000'002;
+
+	const SquareRoot subject = SquareRoot::of(target);
+
+	const auto start = std::chrono::high_resolution_clock::now();
+
+	const Fraction result = subject.k_th_value(k);
+
+	const auto end = std::chrono::high_resolution_clock::now();
+
+	const std::chrono::duration<double> elapsed_seconds = end - start;
+
+	std::cout << "[Benchmark of SquareRoot::k_th_value] \n "
+			  << "\t - nat\t\t\t= " << subject.get_nat()
+	          << ",\n\t - k\t\t\t= " << k
+			  << ",\n\t - Precision\t= " << precision_digits << " decimal digits"
+			  << ",\n\t - Duration\t\t= " << elapsed_seconds.count() << " seconds"
+	<< std::endl;
+
+	SUCCEED();
+}

tests/test_sqrt.cpp

@@ -0,0 +1,21 @@
+#include <gtest/gtest.h>
+#include "../include/SquareRoot.hpp"
+#include "../include/FileReader.hpp"
+#include <string>
+
+TEST(SquareRootTest, Sqrt2With6000000DigitsAtK23) {
+	constexpr unsigned long target = 2UL;;
+	constexpr unsigned long k = 22UL;
+	constexpr std::size_t precision_digits = 6'000'0002;
+	constexpr std::size_t truncate_to = 6'000'000;
+	const std::string data_path = "../data/sqrt_2.txt";
+
+	const SquareRoot subject = SquareRoot::of(target);
+	const Fraction result = subject.k_th_value(k);
+	const std::string actual = result.get_value(precision_digits).substr(0, truncate_to);
+
+	const FileReader reader(data_path);
+	const std::string expected = reader.read_all().substr(0, truncate_to);
+
+	EXPECT_EQ(expected, actual);
+}