@Test
public void testNForIndicesMatchThoseOfActualForLoop() throws Exception {
List<Integer[]> fromActualLoopList = new ArrayList<>();
for (Integer i = -5; i < 3; i++) {
for (Integer j = 0; j >= -6; j--) {
for (Integer k = 4; k != 10; k += 2) {
for (Integer l = -1; l > -9; l -= 3) {
fromActualLoopList.add(new Integer[] {i, j, k, l});
}
}
}
}
List<Integer[]> fromNForLoopList = new ArrayList<>();
NFor<Integer> nfor =
NFor.of(Integer.class)
.from(-5, 0, 4, -1)
.by(1, -1, 2, -3)
.to(lessThan(3), greaterThanOrEqualTo(-6), notEqualTo(10), greaterThan(-9));
for (Integer[] indices : nfor) {
fromNForLoopList.add(indices);
}
Assert.assertEquals(
"Lengths did not match", fromActualLoopList.size(), fromNForLoopList.size());
Assert.assertArrayEquals(
"Values did not match", fromActualLoopList.toArray(), fromNForLoopList.toArray());
}
@Test
public void testEmptyLoop() throws Exception {
NFor<Integer> nfor = NFor.of(Integer.class).from(0, 0).by(1, 1).to(lessThan(-1), lessThan(-1));
int counter = 0;
for (Integer[] indices : nfor) {
counter++;
}
Assert.assertEquals("Looped in empty loop", 0, counter);
}
@Test
public void testInfiniteLoop() throws Exception {
int BREAK_POINT = 10000;
NFor<Integer> nfor =
NFor.of(Integer.class).from(0, 0).by(1, 1).to(noCondition(), lessThanOrEqualTo(1));
int counter = 0;
for (Integer[] indices : nfor) {
if (++counter == BREAK_POINT) {
break;
}
}
Assert.assertEquals("Looped for less than expected amount", BREAK_POINT, counter);
}
@Test
public void testNForWithOtherClass() throws Exception {
NFor<Double> nfor =
NFor.of(Double.class)
.from(0d, 0d, 0d)
.by(.5d, .5d, .5d)
.to(lessThanOrEqualTo(3d), lessThanOrEqualTo(3d), lessThanOrEqualTo(3d));
int loops = 0;
for (Double[] indices : nfor) {
loops++;
}
Assert.assertEquals("Unexpected number of loops", 7 * 7 * 7, loops);
}
@Test(expected = IllegalArgumentException.class)
public void testNForWithIllegalThirdArgument() throws Exception {
NFor.of(Integer.class).from(0, 0, 0).by(1, 1, 1).to(3, 3);
}
@Test(expected = IllegalArgumentException.class)
public void testNForWithIllegalOfArgument() throws Exception {
NFor.of(BigInteger.class);
}