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refactor: Bag data structure (#5340)

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Alex Klymenko
2024-08-17 21:31:29 +02:00
committed by GitHub
parent e8985b3edb
commit 404ad7272f
2 changed files with 153 additions and 60 deletions
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src/test/java/com/thealgorithms/datastructures/bag/BagTest.java Normal file
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package com.thealgorithms.datastructures.bag;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import com.thealgorithms.datastructures.bags.Bag;
import java.util.Iterator;
import org.junit.jupiter.api.Test;
class BagTest {
@Test
void testBagOperations() {
Bag<String> bag = new Bag<>();
assertTrue(bag.isEmpty(), "Bag should be empty initially");
assertEquals(0, bag.size(), "Bag size should be 0 initially");
bag.add("item1");
bag.add("item2");
bag.add("item1"); // adding duplicate item
assertFalse(bag.isEmpty(), "Bag should not be empty after adding elements");
assertEquals(3, bag.size(), "Bag size should be 3 after adding 3 elements");
assertTrue(bag.contains("item1"), "Bag should contain 'item1'");
assertTrue(bag.contains("item2"), "Bag should contain 'item2'");
assertFalse(bag.contains("item3"), "Bag should not contain 'item3'");
assertFalse(bag.contains(null), "Bag should not contain null");
// Test iteration
int count = 0;
for (String item : bag) {
assertTrue(item.equals("item1") || item.equals("item2"), "Item should be either 'item1' or 'item2'");
count++;
}
assertEquals(3, count, "Iterator should traverse all 3 items");
}
@Test
void testBagInitialization() {
Bag<String> bag = new Bag<>();
assertTrue(bag.isEmpty(), "Bag should be empty initially");
assertEquals(0, bag.size(), "Bag size should be 0 initially");
}
@Test
void testAddElements() {
Bag<String> bag = new Bag<>();
bag.add("item1");
bag.add("item2");
bag.add("item1"); // Adding duplicate item
assertFalse(bag.isEmpty(), "Bag should not be empty after adding elements");
assertEquals(3, bag.size(), "Bag size should be 3 after adding 3 elements");
}
@Test
void testContainsMethod() {
Bag<String> bag = new Bag<>();
bag.add("item1");
bag.add("item2");
assertTrue(bag.contains("item1"), "Bag should contain 'item1'");
assertTrue(bag.contains("item2"), "Bag should contain 'item2'");
assertFalse(bag.contains("item3"), "Bag should not contain 'item3'");
assertFalse(bag.contains(null), "Bag should not contain null");
}
@Test
void testContainsAfterRemoveOperation() {
Bag<String> bag = new Bag<>();
bag.add("item1");
bag.add("item2");
assertTrue(bag.contains("item1"), "Bag should contain 'item1' before removal");
assertTrue(bag.contains("item2"), "Bag should contain 'item2' before removal");
}
@Test
void testIterator() {
Bag<String> bag = new Bag<>();
bag.add("item1");
bag.add("item2");
bag.add("item3");
int count = 0;
for (String item : bag) {
assertTrue(item.equals("item1") || item.equals("item2") || item.equals("item3"), "Item should be one of 'item1', 'item2', or 'item3'");
count++;
}
assertEquals(3, count, "Iterator should traverse all 3 items");
}
@Test
void testIteratorEmptyBag() {
Bag<String> bag = new Bag<>();
int count = 0;
for (String ignored : bag) {
org.junit.jupiter.api.Assertions.fail("Iterator should not return any items for an empty bag");
}
assertEquals(0, count, "Iterator should not traverse any items in an empty bag");
}
@Test
void testRemoveMethodThrowsException() {
Bag<String> bag = new Bag<>();
bag.add("item1");
Iterator<String> iterator = bag.iterator();
org.junit.jupiter.api.Assertions.assertThrows(UnsupportedOperationException.class, iterator::remove, "Remove operation should throw UnsupportedOperationException");
}
}