Functional tests for a web app repeating the same code
Move your 4 lines into a method with a [TestFixtureSetUp] Attribute. This will run everytime a test is run.

See here: http://www.nunit.org/index.php?p=fixtureSetup&amp;r=2.2.10

For example:

class ShortTextPopupTests : BaseTest
{
    private ENAEPAdminLoginPage adminLoginPage;
    private AdminResetPage adminResetPage;
    private AppropriateType studentAssessmentPage;

    [TestFixtureSetUp]
    public void SetupFixture()
    {
        adminLoginPage = new ENAEPAdminLoginPage(Driver);
        adminLoginPage.GoToAndLoginWithOperationalBookletSupervisor();
        adminResetPage = new AdminResetPage(Driver);
        studentAssessmentPage = adminResetPage.GoToSpecificBookletLocation(BookletLocations.ShortTextPopup);
        studentAssessmentPage.ShortTextPopup.OpenPopUp();
    }

    [Test]
    [Retry(2)]
    [Description("Validate that the pop up can open and close when it is clicked.")]
    public void GivenCorrectItemIsOpened_WhenTogglingPopup_ThenPopupOpensAndCloses()
    {
        studentAssessmentPage.ShortTextPopup.ClosePopUp();
        Assert.IsFalse(studentAssessmentPage.ShortTextPopup.IsPopUpOpen(), "The pop up did not close after trying to close the pop up");
    }

    [Test]
    [Retry(2)]
    [Description("Validate that opening a pop up, clicking next, coming back to a page, closes that opened pop up")]
    public void NavigationToDifferentPageClosesPopup()
    {
        studentAssessmentPage.ENAEPToolBar.ClickNextButton();
        studentAssessmentPage.ENAEPToolBar.ClickBackButton();
        Assert.IsFalse(studentAssessmentPage.ShortTextPopup.IsPopUpOpen(), "The pop up did not close after leaving and coming back to the page.");
    }

    [Test]
    [Retry(2)]
    [Description("Opening a short text pop up and then clicking on other things on the page should not close the pop up.")]
    [Property("TCID", "35458")]
    public void ClickingItemsOnScreenShouldNotClosePopUps()
    {
        studentAssessmentPage.ClickRandomPlacesOnPage();
        Assert.IsTrue(studentAssessmentPage.ShortTextPopup.IsPopUpOpen(), "The popup did not stay open after clicking in random places in the assessment.");
    }
}