@Test
public void testRead() throws Exception {

    TestReader r1 = new TestReader("1.proto", "1");
    TestReader r2 = new TestReader("2.proto", "2");
    CompositeFileReader reader = new CompositeFileReader(r1, r2);
    CharStream s1 = reader.read("1.proto");
    CharStream s2 = reader.read("2.proto");
    CharStream s3 = reader.read("3.proto");
    assertNotNull(s1);
    assertNotNull(s2);
    assertNull(s3);
    assertEquals("1", s1.getText(Interval.of(0, 1)));
    assertEquals("2", s2.getText(Interval.of(0, 1)));
}