import org.junit.Test;
import org.junit.Before;
import static org.junit.Assert.*;

public abstract class StringAccumulatorTest {
	
	private static final String ONE_HUNDRED_ONES = "1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111";
	private static final String ONE_HUNDRED_AND_ONE_ONES = "11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111";
	private static final String TEN_OCTAVES = "01234567012345670123456701234567012345670123456701234567012345670123456701234567";
	
	private StringAccumulator acc;
	
	@Before
	public void createAccumulator() {
		acc = newStringAccumulator(10);
	}
	
	protected abstract StringAccumulator newStringAccumulator(int bufSize);
	
	@Test
	public void appendOneHundredSingleChars() {
		for (int i = 0; i < 100; ++i) {
			acc.accumulate("1");
		}
		assertEquals(ONE_HUNDRED_ONES, acc.toString());
	}
	
	@Test
	public void appendOneHundredAndOneSingleChars() {
		for (int i = 0; i < 101; ++i) {
			acc.accumulate("1");
		}
		assertEquals(ONE_HUNDRED_AND_ONE_ONES, acc.toString());
	}
	
	@Test
	public void appendTenDecades() {
		for (int i = 0; i < 10; ++i) {
			acc.accumulate("01234567");
		}
		assertEquals(TEN_OCTAVES, acc.toString());
	}
	
	@Test
	public void appendTenDecadesInPairs() {
		for (int i = 0; i < 5; ++i) {
			acc.accumulate("0123456701234567");
		}
		assertEquals(TEN_OCTAVES, acc.toString());
	}
	
	@Test
	public void appendTenDecadesInTriples() {
		for (int i = 0; i < 3; ++i) {
			acc.accumulate("012345670123456701234567");
		}
		acc.accumulate("01234567");
		assertEquals(TEN_OCTAVES, acc.toString());
	}
	
}