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Replace Hamcrest matchers with AssertJ matchers. Fix #24 
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‎build.gradle‎

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -23,7 +23,6 @@ dependencies {
2323
testImplementation 'junit:junit:4.13.2'
2424
testImplementation 'net.bytebuddy:byte-buddy:1.14.12'
2525
testImplementation 'org.assertj:assertj-core:3.27.3'
26-
testImplementation 'org.hamcrest:hamcrest:3.0'
2726
testImplementation 'org.mockito:mockito-core:5.17.0'
2827
testImplementation 'org.awaitility:awaitility:4.3.0'
2928
testImplementation 'nl.jqno.equalsverifier:equalsverifier:3.19.3'

‎src/main/java/by/andd3dfx/numeric/Fibonacci.java‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -19,11 +19,11 @@ public class Fibonacci {
1919
/**
2020
* Top-down approach (recursive, better)
2121
*/
22-
public static int calculate(int n) {
22+
public static int calculateTopDown(int n) {
2323
if (n < 0) throw new IllegalArgumentException("Number should be not less than 0!");
2424

2525
if (!map.containsKey(n)) {
26-
map.put(n, calculate(n - 1) + calculate(n - 2));
26+
map.put(n, calculateTopDown(n - 1) + calculateTopDown(n - 2));
2727
}
2828

2929
return map.get(n);
@@ -32,7 +32,7 @@ public static int calculate(int n) {
3232
/**
3333
* Down-top approach (loop, just as example)
3434
*/
35-
public static int calculate2(int n) {
35+
public static int calculateDownTop(int n) {
3636
if (n < 0) throw new IllegalArgumentException("Number should be not less than 0!");
3737

3838
for (int i = 2; i <= n; i++) {

‎src/test/java/by/andd3dfx/cache/LFUCacheUsingLinkedHashSetTest.java‎

Lines changed: 32 additions & 34 deletions
Original file line numberDiff line numberDiff line change
@@ -2,38 +2,36 @@
22

33
import org.junit.Test;
44

5-
import static org.hamcrest.CoreMatchers.is;
6-
import static org.hamcrest.CoreMatchers.nullValue;
7-
import static org.hamcrest.MatcherAssert.assertThat;
5+
import static org.assertj.core.api.Assertions.assertThat;
86

97
public class LFUCacheUsingLinkedHashSetTest {
108

119
@Test
1210
public void testCacheWithZeroCapacity() {
1311
LFUCacheUsingLinkedHashSet<Integer, Integer> cache = new LFUCacheUsingLinkedHashSet<>(0);
1412

15-
assertThat(cache.get(2), nullValue());
13+
assertThat(cache.get(2)).isNull();
1614
cache.put(2, 67);
17-
assertThat(cache.get(2), nullValue());
15+
assertThat(cache.get(2)).isNull();
1816
}
1917

2018
@Test
2119
public void testCache() {
2220
LFUCacheUsingLinkedHashSet<Integer, Integer> cache = new LFUCacheUsingLinkedHashSet<>(2);
2321
cache.put(1, 10);
2422
cache.put(2, 20);
25-
assertThat(cache.get(1), is(10));
23+
assertThat(cache.get(1)).isEqualTo(10);
2624

2725
cache.put(3, 30); //evicts key 2
2826

29-
assertThat(cache.get(2), nullValue());
30-
assertThat(cache.get(3), is(30));
27+
assertThat(cache.get(2)).isNull();
28+
assertThat(cache.get(3)).isEqualTo(30);
3129

3230
cache.put(4, 40); //evicts key 1
3331

34-
assertThat(cache.get(1), nullValue());
35-
assertThat(cache.get(3), is(30));
36-
assertThat(cache.get(4), is(40));
32+
assertThat(cache.get(1)).isNull();
33+
assertThat(cache.get(3)).isEqualTo(30);
34+
assertThat(cache.get(4)).isEqualTo(40);
3735
}
3836

3937
@Test
@@ -42,29 +40,29 @@ public void testCacheComplex() {
4240
cache.put(1, 10);
4341
cache.put(2, 20);
4442
cache.put(3, 30);
45-
assertThat(cache.get(1), is(10));
46-
assertThat(cache.get(3), is(30));
47-
assertThat(cache.get(1), is(10));
48-
assertThat(cache.get(1), is(10)); // 1 -> 3 times used
49-
assertThat(cache.get(3), is(30)); // 3 -> 2 times used
50-
assertThat(cache.get(2), is(20)); // 2 -> 1 times used
43+
assertThat(cache.get(1)).isEqualTo(10);
44+
assertThat(cache.get(3)).isEqualTo(30);
45+
assertThat(cache.get(1)).isEqualTo(10);
46+
assertThat(cache.get(1)).isEqualTo(10); // 1 -> 3 times used
47+
assertThat(cache.get(3)).isEqualTo(30); // 3 -> 2 times used
48+
assertThat(cache.get(2)).isEqualTo(20); // 2 -> 1 times used
5149

5250
cache.put(4, 40); // evicts key 2 (less used)
5351

54-
assertThat(cache.get(1), is(10)); // 1 -> 4 times used
55-
assertThat(cache.get(2), nullValue());
56-
assertThat(cache.get(4), is(40));
57-
assertThat(cache.get(4), is(40));
58-
assertThat(cache.get(4), is(40)); // 4 -> 3 times used
59-
assertThat(cache.get(3), is(30)); // 3 -> 3 times used
52+
assertThat(cache.get(1)).isEqualTo(10); // 1 -> 4 times used
53+
assertThat(cache.get(2)).isNull();
54+
assertThat(cache.get(4)).isEqualTo(40);
55+
assertThat(cache.get(4)).isEqualTo(40);
56+
assertThat(cache.get(4)).isEqualTo(40); // 4 -> 3 times used
57+
assertThat(cache.get(3)).isEqualTo(30); // 3 -> 3 times used
6058

6159
cache.put(5, 50); // evicts key 4 (same used as 3, but 3 is last used)
6260

63-
assertThat(cache.get(1), is(10));
64-
assertThat(cache.get(2), nullValue());
65-
assertThat(cache.get(3), is(30));
66-
assertThat(cache.get(4), nullValue());
67-
assertThat(cache.get(5), is(50));
61+
assertThat(cache.get(1)).isEqualTo(10);
62+
assertThat(cache.get(2)).isNull();
63+
assertThat(cache.get(3)).isEqualTo(30);
64+
assertThat(cache.get(4)).isNull();
65+
assertThat(cache.get(5)).isEqualTo(50);
6866
}
6967

7068
@Test
@@ -74,23 +72,23 @@ public void testCacheLeetCode_updateValue() {
7472
cache.put(2, 1);
7573
cache.put(2, 2); // overwrites value for key 2
7674
cache.put(4, 4); // evicts key 3
77-
assertThat(cache.get(2), is(2));
75+
assertThat(cache.get(2)).isEqualTo(2);
7876
}
7977

8078
@Test
8179
public void determineKeyToDelete() {
8280
var cache = new LFUCacheUsingLinkedHashSet<Integer, Integer>(2);
8381
cache.put(2, 100);
8482
cache.put(3, 200);
85-
assertThat(cache.determineKeyToDelete(), is(2));
83+
assertThat(cache.determineKeyToDelete()).isEqualTo(2);
8684

8785
cache.get(2);
88-
assertThat(cache.determineKeyToDelete(), is(3));
86+
assertThat(cache.determineKeyToDelete()).isEqualTo(3);
8987
cache.get(3);
90-
assertThat(cache.determineKeyToDelete(), is(2));
88+
assertThat(cache.determineKeyToDelete()).isEqualTo(2);
9189
cache.put(4, 500);
92-
assertThat(cache.determineKeyToDelete(), is(4));
90+
assertThat(cache.determineKeyToDelete()).isEqualTo(4);
9391
cache.get(4);
94-
assertThat(cache.determineKeyToDelete(), is(3));
92+
assertThat(cache.determineKeyToDelete()).isEqualTo(3);
9593
}
9694
}

‎src/test/java/by/andd3dfx/cache/LFUCacheUsingTimeTest.java‎

Lines changed: 32 additions & 34 deletions
Original file line numberDiff line numberDiff line change
@@ -2,38 +2,36 @@
22

33
import org.junit.Test;
44

5-
import static org.hamcrest.CoreMatchers.is;
6-
import static org.hamcrest.CoreMatchers.nullValue;
7-
import static org.hamcrest.MatcherAssert.assertThat;
5+
import static org.assertj.core.api.Assertions.assertThat;
86

97
public class LFUCacheUsingTimeTest {
108

119
@Test
1210
public void testCacheWithZeroCapacity() {
1311
LFUCacheUsingTime<Integer, Integer> cache = new LFUCacheUsingTime<>(0);
1412

15-
assertThat(cache.get(2), nullValue());
13+
assertThat(cache.get(2)).isNull();
1614
cache.put(2, 67);
17-
assertThat(cache.get(2), nullValue());
15+
assertThat(cache.get(2)).isNull();
1816
}
1917

2018
@Test
2119
public void testCache() {
2220
LFUCacheUsingTime<Integer, Integer> cache = new LFUCacheUsingTime<>(2);
2321
cache.put(1, 10);
2422
cache.put(2, 20);
25-
assertThat(cache.get(1), is(10));
23+
assertThat(cache.get(1)).isEqualTo(10);
2624

2725
cache.put(3, 30); //evicts key 2
2826

29-
assertThat(cache.get(2), nullValue());
30-
assertThat(cache.get(3), is(30));
27+
assertThat(cache.get(2)).isNull();
28+
assertThat(cache.get(3)).isEqualTo(30);
3129

3230
cache.put(4, 40); //evicts key 1
3331

34-
assertThat(cache.get(1), nullValue());
35-
assertThat(cache.get(3), is(30));
36-
assertThat(cache.get(4), is(40));
32+
assertThat(cache.get(1)).isNull();
33+
assertThat(cache.get(3)).isEqualTo(30);
34+
assertThat(cache.get(4)).isEqualTo(40);
3735
}
3836

3937
@Test
@@ -42,29 +40,29 @@ public void testCacheComplex() {
4240
cache.put(1, 10);
4341
cache.put(2, 20);
4442
cache.put(3, 30);
45-
assertThat(cache.get(1), is(10));
46-
assertThat(cache.get(3), is(30));
47-
assertThat(cache.get(1), is(10));
48-
assertThat(cache.get(1), is(10)); // 1 -> 3 times used
49-
assertThat(cache.get(3), is(30)); // 3 -> 2 times used
50-
assertThat(cache.get(2), is(20)); // 2 -> 1 times used
43+
assertThat(cache.get(1)).isEqualTo(10);
44+
assertThat(cache.get(3)).isEqualTo(30);
45+
assertThat(cache.get(1)).isEqualTo(10);
46+
assertThat(cache.get(1)).isEqualTo(10); // 1 -> 3 times used
47+
assertThat(cache.get(3)).isEqualTo(30); // 3 -> 2 times used
48+
assertThat(cache.get(2)).isEqualTo(20); // 2 -> 1 times used
5149

5250
cache.put(4, 40); // evicts key 2 (less used)
5351

54-
assertThat(cache.get(1), is(10)); // 1 -> 4 times used
55-
assertThat(cache.get(2), nullValue());
56-
assertThat(cache.get(4), is(40));
57-
assertThat(cache.get(4), is(40));
58-
assertThat(cache.get(4), is(40)); // 4 -> 3 times used
59-
assertThat(cache.get(3), is(30)); // 3 -> 3 times used
52+
assertThat(cache.get(1)).isEqualTo(10); // 1 -> 4 times used
53+
assertThat(cache.get(2)).isNull();
54+
assertThat(cache.get(4)).isEqualTo(40);
55+
assertThat(cache.get(4)).isEqualTo(40);
56+
assertThat(cache.get(4)).isEqualTo(40); // 4 -> 3 times used
57+
assertThat(cache.get(3)).isEqualTo(30); // 3 -> 3 times used
6058

6159
cache.put(5, 50); // evicts key 4 (same used as 3, but 3 is last used)
6260

63-
assertThat(cache.get(1), is(10));
64-
assertThat(cache.get(2), nullValue());
65-
assertThat(cache.get(3), is(30));
66-
assertThat(cache.get(4), nullValue());
67-
assertThat(cache.get(5), is(50));
61+
assertThat(cache.get(1)).isEqualTo(10);
62+
assertThat(cache.get(2)).isNull();
63+
assertThat(cache.get(3)).isEqualTo(30);
64+
assertThat(cache.get(4)).isNull();
65+
assertThat(cache.get(5)).isEqualTo(50);
6866
}
6967

7068
@Test
@@ -74,23 +72,23 @@ public void testCacheLeetcode_updateValue() {
7472
cache.put(2, 1);
7573
cache.put(2, 2); // overwrites value for key 2
7674
cache.put(4, 4); // evicts key 3
77-
assertThat(cache.get(2), is(2));
75+
assertThat(cache.get(2)).isEqualTo(2);
7876
}
7977

8078
@Test
8179
public void determineKeyToDelete() {
8280
var cache = new LFUCacheUsingTime<Integer, Integer>(2);
8381
cache.put(2, 100);
8482
cache.put(3, 200);
85-
assertThat(cache.determineKeyToDelete(), is(2));
83+
assertThat(cache.determineKeyToDelete()).isEqualTo(2);
8684

8785
cache.get(2);
88-
assertThat(cache.determineKeyToDelete(), is(3));
86+
assertThat(cache.determineKeyToDelete()).isEqualTo(3);
8987
cache.get(3);
90-
assertThat(cache.determineKeyToDelete(), is(2));
88+
assertThat(cache.determineKeyToDelete()).isEqualTo(2);
9189
cache.put(4, 500);
92-
assertThat(cache.determineKeyToDelete(), is(4));
90+
assertThat(cache.determineKeyToDelete()).isEqualTo(4);
9391
cache.get(4);
94-
assertThat(cache.determineKeyToDelete(), is(3));
92+
assertThat(cache.determineKeyToDelete()).isEqualTo(3);
9593
}
9694
}

‎src/test/java/by/andd3dfx/cache/LRUCacheTest.java‎

Lines changed: 8 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -2,9 +2,7 @@
22

33
import org.junit.Test;
44

5-
import static org.hamcrest.CoreMatchers.is;
6-
import static org.hamcrest.CoreMatchers.nullValue;
7-
import static org.hamcrest.MatcherAssert.assertThat;
5+
import static org.assertj.core.api.Assertions.assertThat;
86

97
public class LRUCacheTest {
108

@@ -13,20 +11,20 @@ public void testCache() {
1311
LRUCache<Integer, Integer> cache = new LRUCache<>(2);
1412
cache.put(1, 1);
1513
cache.put(2, 4);
16-
assertThat(cache.get(1), is(1));
14+
assertThat(cache.get(1)).isEqualTo(1);
1715
cache.put(3, 9); // evicts key 2
18-
assertThat(cache.get(2), nullValue());
16+
assertThat(cache.get(2)).isNull();
1917
cache.put(4, 16); // evicts key 1
20-
assertThat(cache.get(1), nullValue());
21-
assertThat(cache.get(3), is(9));
22-
assertThat(cache.get(4), is(16));
18+
assertThat(cache.get(1)).isNull();
19+
assertThat(cache.get(3)).isEqualTo(9);
20+
assertThat(cache.get(4)).isEqualTo(16);
2321
}
2422

2523
@Test
2624
public void testCacheForZeroCapacity() {
2725
LRUCache<Integer, Integer> cache = new LRUCache<>(0);
2826
cache.put(2, 4);
29-
assertThat(cache.get(2), nullValue());
30-
assertThat(cache.get(1), nullValue());
27+
assertThat(cache.get(2)).isNull();
28+
assertThat(cache.get(1)).isNull();
3129
}
3230
}

‎src/test/java/by/andd3dfx/collections/ReverseLinkedListTest.java‎

Lines changed: 13 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -6,8 +6,7 @@
66
import static by.andd3dfx.collections.ReverseLinkedList.reverseUsingLoop;
77
import static by.andd3dfx.collections.ReverseLinkedList.reverseUsingRecursion;
88
import static by.andd3dfx.collections.ReverseLinkedList.reverseUsingStack;
9-
import static org.hamcrest.CoreMatchers.is;
10-
import static org.hamcrest.MatcherAssert.assertThat;
9+
import static org.assertj.core.api.Assertions.assertThat;
1110
import static org.junit.Assert.assertNull;
1211

1312
public class ReverseLinkedListTest {
@@ -51,15 +50,20 @@ public void testReverseUsingRecursionForNull() {
5150
assertNull(reverseUsingRecursion(null));
5251
}
5352

54-
private Node buildLinkedList() {
55-
return new Node(3, new Node(7, new Node(12, new Node(10, null))));
53+
private Node<Integer> buildLinkedList() {
54+
return new Node<>(3, new Node<>(7, new Node<>(12, new Node<>(10, null))));
5655
}
5756

5857
private void checkReversedList(Node head) {
59-
assertThat("Wrong 0 item of reversed list", head.getValue(), is(10));
60-
assertThat("Wrong 1 item of reversed list", head.getNext().getValue(), is(12));
61-
assertThat("Wrong 2 item of reversed list", head.getNext().getNext().getValue(), is(7));
62-
assertThat("Wrong 3 item of reversed list", head.getNext().getNext().getNext().getValue(), is(3));
63-
assertNull("Wrong next of 3 item of reversed list", head.getNext().getNext().getNext().getNext());
58+
assertThat(head.getValue())
59+
.as("Wrong 0 item of reversed list").isEqualTo(10);
60+
assertThat(head.getNext().getValue())
61+
.as("Wrong 1 item of reversed list").isEqualTo(12);
62+
assertThat(head.getNext().getNext().getValue())
63+
.as("Wrong 2 item of reversed list").isEqualTo(7);
64+
assertThat(head.getNext().getNext().getNext().getValue())
65+
.as("Wrong 3 item of reversed list").isEqualTo(3);
66+
assertThat(head.getNext().getNext().getNext().getNext())
67+
.as("Wrong next of 3 item of reversed list").isNull();
6468
}
6569
}

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