sample.cpp

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// tests.cpp
#include <gtest/gtest.h>
#include <math.h>

double squareRoot(const double a)
{
  double b = sqrt(a);
  if (b != b)  // nan check
  {
    return -1.0;
  }
  else
  {
    return sqrt(a);
  }
}

TEST(SquareRootTest, PositiveNos)
{
  ASSERT_EQ(6, squareRoot(36.0));
  ASSERT_EQ(18.0, squareRoot(324.0));
  ASSERT_EQ(25.4, squareRoot(645.16));
  ASSERT_EQ(0, squareRoot(0.0));
}

TEST(SquareRootTest, NegativeNos)
{
  ASSERT_EQ(-1.0, squareRoot(-15.0));
  ASSERT_EQ(-1.0, squareRoot(-0.2));
}

int main(int argc, char **argv)
{
  testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}