@Test
public void first_3_of_two_level_2_should_be_0x1_0x2_1x1() {
CountingPathGenerator gen = new CountingPathGenerator(2, 2, Paths.get("."));
assertThat(gen.next()).isEqualTo(Paths.get("./0/0"));
assertThat(gen.next()).isEqualTo(Paths.get("./0/1"));
assertThat(gen.next()).isEqualTo(Paths.get("./1/0"));
}
@Test
public void first_3_of_one_level_10_should_be_1_2_3() {
CountingPathGenerator gen = new CountingPathGenerator(1, 10, Paths.get("."));
assertThat(gen.next()).isEqualTo(Paths.get("./0"));
assertThat(gen.next()).isEqualTo(Paths.get("./1"));
assertThat(gen.next()).isEqualTo(Paths.get("./2"));
}
@Test
public void more_than_9_should_exhaust_3_level_3() {
int levels = 3;
int filesPerLevel = 3;
CountingPathGenerator gen = new CountingPathGenerator(levels, filesPerLevel, Paths.get("."));
for (int i = 0; i < Math.pow(filesPerLevel, levels); i++) {
assertThat(gen.hasNext()).isTrue();
gen.next();
}
assertThat(gen.hasNext()).isFalse();
assertThatExceptionOfType(NoSuchElementException.class).isThrownBy(gen::next);
}