@Test
public void testReplace() throws IOException {
REPLACE replace = new REPLACE();
Tuple testTuple = Util.buildTuple("foobar", "z", "x");
assertEquals("foobar".replace("z", "x"), replace.exec(testTuple));
testTuple = Util.buildTuple("foobar", "oo", "aa");
assertEquals("foobar".replace("oo", "aa"), replace.exec(testTuple));
}