GoogleTest for classes that have a constructor

[foggy lake]

Hello, i'm trying to implement a test for a class Lexer which is defined like this

class Lexer {
public:
    Lexer(std::string program);
    SyntaxToken lex();
private:
    char current();
    char peekNext();
    char lookAhead(int offset);
    void advance();
    int index = 0;
    std::string program;

    unsigned int row = 0;
};

but it has a default constructor that accepts a std::string program.
So in the method

TEST_F(LexerTest, LexerInit)
{

}

what should I do?

I saw this post on stackoverflow https://stackoverflow.com/questions/38207346/specify-constructor-arguments-for-a-google-test-fixture but it deosn't seem great. Do I have to override all the Lexer's methods? Copy and paste other methods?

[devout blade]

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[foggy lake]

!solved