package com.uwetrottmann.trakt.v2;

import com.uwetrottmann.trakt.v2.entities.Ratings;
import org.junit.BeforeClass;

import static org.assertj.core.api.Assertions.assertThat;

public class BaseTestCase {

    protected static final String TEST_CLIENT_ID = "e683ed71dd4a4afe73ba73151a4645f511b8703464a7807045088c733ef8d634";
    public static final String TEST_ACCESS_TOKEN = "441cb73d1c6387540ebe83af86e8bac5c209d402a66c429b9f4a3374359df9fc"; // "uwe" on v2 test server

    private static final boolean DEBUG = true;

    private static final TraktV2 trakt = new TraktV2();
    protected static final Integer DEFAULT_PAGE_SIZE = 10;

    @BeforeClass
    public static void setUpOnce() {
        trakt.setApiKey(TEST_CLIENT_ID);
        trakt.setAccessToken(TEST_ACCESS_TOKEN);
        trakt.setIsDebug(DEBUG);
    }

    protected final TraktV2 getTrakt() {
        return trakt;
    }

    public void assertRatings(Ratings ratings) {
        assertThat(ratings.rating).isGreaterThanOrEqualTo(0);
        assertThat(ratings.votes).isGreaterThanOrEqualTo(0);
        assertThat(ratings.distribution).hasSize(10);
    }

}

package com.uwetrottmann.trakt.v2;

import com.uwetrottmann.trakt.v2.entities.Ratings;
import org.junit.BeforeClass;

import static org.assertj.core.api.Assertions.assertThat;

public class BaseTestCase {

    protected static final String TEST_CLIENT_ID = "e683ed71dd4a4afe73ba73151a4645f511b8703464a7807045088c733ef8d634";
    public static final String TEST_ACCESS_TOKEN = "441cb73d1c6387540ebe83af86e8bac5c209d402a66c429b9f4a3374359df9fc"; // "uwe" on v2 test server

    private static final boolean DEBUG = true;

    private static final TraktV2 trakt = new TraktV2();
    protected static final Integer DEFAULT_PAGE_SIZE = 10;

    @BeforeClass
    public static void setUpOnce() {
        trakt.setApiKey(TEST_CLIENT_ID);
        trakt.setAccessToken(TEST_ACCESS_TOKEN);
        trakt.setIsDebug(DEBUG);
    }

    protected final TraktV2 getTrakt() {
        return trakt;
    }

    public void assertRatings(Ratings ratings) {
        // rating can be null, but we use a show where we can be sure it's rated
        assertThat(ratings.rating).isGreaterThanOrEqualTo(0);
        assertThat(ratings.votes).isGreaterThanOrEqualTo(0);
        assertThat(ratings.distribution).hasSize(10);
    }

}

Add note about rating being null.