ChoiceFormatTest.java

import org.junit.Test;
import java.text.MessageFormat;
import static org.assertj.core.api.Assertions.assertThat;

public class ChoiceFormatTest {

    @Test
    public void noApples() {
        int count = 0;
        assertThat(getMessage(count)).isEqualTo("I got no apples");
    }

    @Test
    public void oneApple() {
        int count = 1;
        assertThat(getMessage(count)).isEqualTo("I got one apple");
    }

    @Test
    public void twoApple() {
        int count = 2;
        assertThat(getMessage(count)).isEqualTo("I got 2 apples");
    }

    @Test
    public void threeApple() {
        int count = 3;
        assertThat(getMessage(count)).isEqualTo("I got 3 apples");
    }

    @Test
    public void lotsOfApples() {
        int count = 4;
        assertThat(getMessage(count)).isEqualTo("I got lots of apples");
    }

    private String getMessage(int appleCount) {
        return MessageFormat.format("I got {0,choice,0#no apples|1#one apple|1<{0} apples|3<lots of apples}", appleCount);
    }
}