c++ - How to pass parameters to the gtest

Question

How can I pass parameter to my test suites?

gtest --number-of-input=5

I have the following main gtest code. And --number-of-input=5 should be passed to InitGoogleTest().

#include <iostream>
#include <gtest/gtest.h>

int main(int argc, char **argv) {
  std::cout << "Running main() from gtest_main.cc
";
  ::testing::GTEST_FLAG(output) = "xml:hello.xml";
  testing::InitGoogleTest(&argc, argv);

  return RUN_ALL_TESTS();
}

I don't know how to pass my parameter to the test suites/cases as follows?

class TestTwo : public QuickTest {
 protected:
  virtual void SetUp() {
      QuickTest::SetUp();
      square = new Square(10);
      circle = new Circle(10);

  }

  virtual void TearDown() {
      delete square;
      delete circle;
      QuickTest::TearDown();
  }

  Square* square;
  Circle* circle;
};


// Now, let's write tests using the QueueTest fixture.

// Tests the default constructor.
TEST_F(TestOne, DefaultConstructor) {
  EXPECT_EQ(100.0, square->area());
}
TEST_F(TestOne, DefaultDestructor) {
  EXPECT_EQ(1,1);
}
TEST_F(TestOne, VHDL_EMIT_Passthrough) {
  EXPECT_EQ(1,1);
}
TEST_F(TestOne, VHDL_BUILD_Passthrough) {
  EXPECT_EQ(1,1);
}

Added

I modified the main method to show the argv[i] after InitGoogleTest().

int main(int argc, char **argv) {
    std::cout << "Running main() from gtest_main.cc
";
    ::testing::GTEST_FLAG(output) = "xml:hello.xml";
    testing::InitGoogleTest(&argc, argv);

    for (int i = 0; i < argc; i++) {
        cout << i << ":" << argv[i] << endl;
    }

This is the arguments given to the gtest: ./s --number-of-input=5 --gtest_filter=Test_Cases1*.

This is the results:

Running main() from gtest_main.cc
0:./s
1:--number-of-input=5
Note: Google Test filter = Test_Cases1*
[==========] Running 0 tests from 0 test cases.
[==========] 0 tests from 0 test cases ran. (0 ms total)
[  PASSED  ] 0 tests.

gtest filters out the tests that does not have the name of Test_Cases1, and it also shows the correct arguments other than those start with gtest.

Reference - How to run specific test cases in GoogleTest

Answer 1

Google Test only recognizes its own command-line options. Each time it finds one, it removes it from argv and updates argc accordingly, so after InitGoogleTest returns, anything left over in argv is available for you to process yourself. Use your favorite command-line-parsing technique, store the results in some global variable, and refer to it during your tests.

If a command-line options looks like a Google Test option but really isn't, then the program will print its help message and exit without running any tests. Google Test options start with gtest_.