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



void Function (std::vector <int>& v)
{
    for (auto x = v.begin (); x != v.end (); ++x) {
        if ( (* x) == 42) {
            v.erase (x);
        }
    }
}


class FunctionTest : public ::testing::Test
{
    protected:
        virtual void SetUp    () {};
        virtual void TearDown () {};
};



TEST_F (FunctionTest, EmptyVectorProcessedSuccess)
{
    // Arrange.
    std::vector <int> testVector   {};

    // Act.
    Function (testVector);

    // Assert.
    EXPECT_EQ (testVector.size (), 0);
}



TEST_F (FunctionTest, NotEmptyVectorProcessedWithRemovingSuccess)
{
    // Arrange.
    std::vector <int> etalonVector {1, 3};
    std::vector <int> testVector   {1, 42, 3};

    // Act.
    Function (testVector);

    // Assert.
    ASSERT_EQ (etalonVector.size (), testVector.size () );
    for (int i = 0; i < etalonVector.size (); ++i) {
        EXPECT_EQ (etalonVector [i], testVector [i]);
    }
}



TEST_F (FunctionTest, NotEmptyVectorProcessedWithoutRemovingSuccess)
{
    // Arrange.
    std::vector <int> etalonVector {1, 2, 3};
    std::vector <int> testVector   {1, 2, 3};

    // Act.
    Function (testVector);

    // Assert.
    ASSERT_EQ (etalonVector.size (), testVector.size () );
    for (int i = 0; i < etalonVector.size (); ++i) {
        EXPECT_EQ (etalonVector [i], testVector [i]);
    }
}