Selenium Test Angular Multiselect Dropdown

DropdownBoxTest.java

package tst;

import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.NoSuchElementException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.FluentWait;
import org.openqa.selenium.support.ui.Wait;

import java.util.concurrent.TimeUnit;

public class DropdownBoxTest {
    @Test
    public void asfd() throws InterruptedException {
        System.setProperty("webdriver.gecko.driver", "geckodriver.exe");
        WebDriver driver = new FirefoxDriver();
        driver.navigate().to("http://softsimon.github.io/angular-2-dropdown-multiselect/");
        Wait<WebDriver> wait = new FluentWait<>(driver)
                .withTimeout(5, TimeUnit.SECONDS)
                .pollingEvery(200, TimeUnit.MILLISECONDS)
                .ignoring(NoSuchElementException.class);
        wait.until(d -> d.findElement(By.tagName("ss-multiselect-dropdown"))
                .findElement(By.tagName("button")));

        // Click button
        driver.findElement(By.tagName("ss-multiselect-dropdown"))
                .findElement(By.tagName("button"))
                .click();

        // Click checkboxes
        driver.findElement(By.cssSelector("ss-multiselect-dropdown"))
                .findElements(By.tagName("a"))
                .stream()
                .filter(elem -> {
                    String text = elem.getText();
                    return text.contains("Norway") || text.contains("Finland");
                }).forEach(WebElement::click);

    }
}