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cd /usr/local/src/
proxychains wget https://github.com/google/googletest/archive/release-1.8.1.tar.gz
tar -xzvf release-1.8.1.tar.gz
cd googletest-release-1.8.1/
mkdir build
cd build
cmake ../
make && make install

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sudo apt install libgtest-dev
cd /usr/src/gtest/
mkdir build
cd build
sudo cmake ..
sudo make
cp ./lib/*.a /usr/local/lib/

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#include "demo.h"

int add(int a, int b) {
  return (a + b);
}

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#ifndef C_DEMO_H_
#define C_DEMO_H_

int add(int a, int b);

#endif //  C_DEMO_H_

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#include <gtest/gtest.h>
#include "demo.cpp"

TEST(add, case1) {
  EXPECT_LT(2, add(0, 2));
  EXPECT_EQ(7, add(5, 2));
  ASSERT_LT(-2, add(1, 2));
  ASSERT_EQ(3, add(1, 2));
}

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

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g++ -std=c++11 test.cpp -o test -lgtest -lpthread

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[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from add
[ RUN      ] add.case1
test_demo.cpp:5: Failure
Expected: (2) < (add(0, 2)), actual: 2 vs 2
[  FAILED  ] add.case1 (0 ms)
[----------] 1 test from add (0 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (0 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] add.case1