java-cons

This small, one interface project is a try to reimplement the mechanics used in Rackets cons cells in Java.
git clone git://git.oshgnacknak.de/java-cons.git
Log | Files | Refs | README

EmptyTest.java (941B)

      1 import org.junit.jupiter.api.Test;
      2 
      3 import static org.junit.jupiter.api.Assertions.*;
      4 
      5 class EmptyTest {
      6 
      7     Cons<Integer> empty = new Empty<>();
      8 
      9     @Test
     10     void testFirst() {
     11         assertThrows(UnsupportedOperationException.class, () -> empty.first());
     12     }
     13 
     14     @Test
     15     void testRest() {
     16         assertThrows(UnsupportedOperationException.class, () -> empty.rest());
     17     }
     18 
     19     @Test
     20     void testMap() {
     21         assertEquals(new Empty<>(), empty.map(n -> n+1));
     22     }
     23 
     24     @Test
     25     void testFilter() {
     26         assertEquals(new Empty<>(), empty.filter(n -> n>4));
     27     }
     28 
     29     @Test
     30     void testFoldl() {
     31         assertEquals(4, empty.foldl(Integer::sum, 4));
     32     }
     33 
     34     @Test
     35     void testFoldr() {
     36         assertEquals(4, empty.foldr(Integer::sum, 4));
     37     }
     38 
     39     @Test
     40     void testEmpty() {
     41         assertTrue(empty.empty());
     42     }
     43 
     44     @Test
     45     void testToString() {
     46         assertEquals("empty", empty.toString());
     47     }
     48 }