1 package uk.org.lidalia.slf4jtest;
2
3 import com.google.common.base.Supplier;
4 import com.google.common.collect.ImmutableMap;
5 import org.junit.Test;
6
7 import java.util.List;
8 import java.util.Map;
9
10 import static java.util.Arrays.asList;
11 import static org.hamcrest.Matchers.is;
12 import static org.hamcrest.Matchers.not;
13 import static org.hamcrest.Matchers.sameInstance;
14 import static org.junit.Assert.assertThat;
15 import static uk.org.lidalia.slf4jtest.Suppliers.makeEmptyMutableList;
16 import static uk.org.lidalia.slf4jtest.Suppliers.makeEmptyMutableMap;
17 import static uk.org.lidalia.test.Assert.isNotInstantiable;
18
19 public class SuppliersTests {
20
21 @Test
22 public void makeEmptyMutableListAlwaysMakesANewList() {
23 Supplier<List<String>> listSupplier = makeEmptyMutableList();
24 List<String> list1 = listSupplier.get();
25 List<String> list2 = listSupplier.get();
26 assertThat(list1, is(not(sameInstance(list2))));
27 }
28
29 @Test
30 public void makeEmptyMutableListMakesAMutableList() {
31 List<String> list = Suppliers.<String>makeEmptyMutableList().get();
32 list.add("value");
33 assertThat(list, is(asList("value")));
34 }
35
36 @Test
37 public void makeEmptyMutableMapAlwaysMakesANewMap() {
38 Supplier<Map<String, String>> mapSupplier = makeEmptyMutableMap();
39 Map<String, String> map1 = mapSupplier.get();
40 Map<String, String> map2 = mapSupplier.get();
41 assertThat(map1, is(not(sameInstance(map2))));
42 }
43
44 @Test
45 public void makeEmptyMutableMapMakesAMutableMap() {
46 Map<String, String> map = Suppliers.<String, String>makeEmptyMutableMap().get();
47 map.put("key", "value");
48 Map<String, String> expected = ImmutableMap.of("key", "value");
49 assertThat(map, is(expected));
50 }
51
52 @Test
53 public void notInstantiable() {
54 assertThat(Suppliers.class, isNotInstantiable());
55 }
56 }