public void DisplayGermanExchangeStudents()
    {
        string actual = HighSchoolSweethearts.DisplayGermanExchangeStudents("Norbert", "Heidi",
                                                                            new DateTime(2019, 1, 22), 1535.22f);

        Assert.Equal("Norbert and Heidi have been dating since 22.01.2019 - that's 1.535,22 hours"
                     , actual);
    }
    public void DisplaySingleLine()
    {
        const string expected = "                  Lance Green ♡ Pat Riley                    ";

        Assert.Equal(expected, HighSchoolSweethearts.DisplaySingleLine("Lance Green", "Pat Riley"));
    }
    public void DisplayBanner()
    {
        string actualBanner = HighSchoolSweethearts.DisplayBanner("L. G. ", "P. R. ");

        Assert.Equal(expectedBanner.Trim(), actualBanner.Trim());
    }
    public void DisplayFooBarBanner()
    {
        string actualBanner = HighSchoolSweethearts.DisplayBanner("Foo", "Bar");

        Assert.Equal(expectedFooBarBanner.Trim(), actualBanner.Trim());
    }