import static org.junit.Assert.*;

import org.junit.Before;
import org.junit.Test;

public class Question4Test {

	String s1, s2, s3, s4, s5,s6;

	@Before
	public void setUp() {
		s1 = "s9782647 and S9782647 and especially s0000001 but never s876";
		s2 = "s1234567 and S1234567 then input s8765432 S0000005 S8765432";
		s3 = "s86 s976753 s s123 s957";
		s4 = "s9782647,S9782647 and especially s0000001 but never s876.";
		s5 = "s9782647_S9782647 and especially s0000001 but never s876.";	
		s6 = "s1234567";
	}

	@Test
	public void testBasicWithCase() {
		assertEquals("s9782647,S9782647,s0000001", Question4.findStudentIds(s1));
	}
	
	@Test
	public void testNone() {
		assertEquals("", Question4.findStudentIds(s3));
	}
	
	@Test
	public void testLots() {
		assertEquals("s1234567,S1234567,s8765432,S0000005,S8765432",
				Question4.findStudentIds(s2));
	}

	@Test
	public void testComma() {
		assertEquals("s9782647,S9782647,s0000001", Question4.findStudentIds(s4));
	}

	@Test
	public void testUnderscore() {
		assertEquals("s0000001", Question4.findStudentIds(s5));
	}

	// don't actually mind if this fails
	@Test
	public void testNull() {
		assertEquals("", Question4.findStudentIds(null));
	}
	
	@Test
	public void testWholeStringIsMatch() {
		assertEquals("s1234567", Question4.findStudentIds(s6));
	}
}