test_test.cc
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	#include <cmath>
	#include <exception>
	#include <gtest/gtest.h>

	struct NegativeException : public std::exception {};

	double mysqrt(double x) {

	if (x < 0.)
	throw NegativeException();

	return std::sqrt(x);
	}

	// MACRO function "TEST" from Google Test
	// defines a test and a context
	TEST(MysqrtTest, positive_integers) {
	EXPECT_EQ(2, mysqrt(4));
	EXPECT_EQ(4, mysqrt(16));
	EXPECT_EQ(3, mysqrt(9));
	}