#include <gtest/gtest.h>
int add(int a, int b) {
    return a + b;
}
TEST(AddTest, PositiveNumbers) {
    EXPECT_EQ(add(1, 2), 3);
    EXPECT_EQ(add(2, 3), 5);
}
TEST(AddTest, NegativeNumbers) {
    EXPECT_EQ(add(-1, -1), -2);
    EXPECT_EQ(add(-1, 1), 0);
}