package ru.stqa.pft.addressbook.tests;

import com.thoughtworks.xstream.XStream;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import ru.stqa.pft.addressbook.model.GroupData;
import ru.stqa.pft.addressbook.model.Groups;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;

public class GroupCreationTest extends TestBase {

    @DataProvider
    public Iterator<Object[]> validGroups() throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(new File("src/test/resources/groups.csv")));
        String xml = "";
        String line = reader.readLine();
        while (line != null) {
            xml += line;
            line = reader.readLine();
        }
        XStream xstream = new XStream();
        List<GroupData> groups = (List<GroupData>) xstream.fromXML(xml);
        return groups.stream().map((g) -> new Object[] {g}).collect(Collectors.toList()).iterator();
    }

    @Test(dataProvider = "validGroups")
    public void testGroupCreation(GroupData group) {
        app.goTo().groupPage();
        Groups before = app.group().all();
        app.group().create(group);
        assertThat(app.group().count(), equalTo(before.size() +1));
        Groups after = app.group().all();
        assertThat(after, equalTo(
                before.withAdded(group.withId(after.stream().mapToInt((g) -> g.getId()).max().getAsInt()))));
    }

    @Test(enabled=false)
    public void testBadGroupCreation() {
        app.goTo().groupPage();
        Groups before = app.group().all();
        GroupData group = new GroupData().withName("Test34'");
        app.group().create(group);
        assertThat(app.group().count(), equalTo(before.size()));
        Groups after = app.group().all();
        assertThat(after, equalTo(before));
    }
}
package ru.stqa.pft.addressbook.tests;

import com.thoughtworks.xstream.XStream;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import ru.stqa.pft.addressbook.model.GroupData;
import ru.stqa.pft.addressbook.model.Groups;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;

public class GroupCreationTest extends TestBase {

    @DataProvider
    public Iterator<Object[]> validGroups() throws IOException {
        BufferedReader reader = new BufferedReader(new FileReader(new File("src/test/resources/groups.xml")));
        String xml = "";
        String line = reader.readLine();
        while (line != null) {
            xml += line;
            line = reader.readLine();
        }
        XStream xstream = new XStream();
        List<GroupData> groups = (List<GroupData>) xstream.fromXML(xml);
        return groups.stream().map((g) -> new Object[] {g}).collect(Collectors.toList()).iterator();
    }

    @Test(dataProvider = "validGroups")
    public void testGroupCreation(GroupData group) {
        app.goTo().groupPage();
        Groups before = app.group().all();
        app.group().create(group);
        assertThat(app.group().count(), equalTo(before.size() +1));
        Groups after = app.group().all();
        assertThat(after, equalTo(
                before.withAdded(group.withId(after.stream().mapToInt((g) -> g.getId()).max().getAsInt()))));
    }

    @Test(enabled=false)
    public void testBadGroupCreation() {
        app.goTo().groupPage();
        Groups before = app.group().all();
        GroupData group = new GroupData().withName("Test34'");
        app.group().create(group);
        assertThat(app.group().count(), equalTo(before.size()));
        Groups after = app.group().all();
        assertThat(after, equalTo(before));
    }
}

Update GroupCreationTest.java