refactor: BloomFilter (#5325)

src/test/java/com/thealgorithms/datastructures/bloomfilter/BloomFilterTest.java

@@ -1,12 +1,19 @@
 package com.thealgorithms.datastructures.bloomfilter;
 
 import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 public class BloomFilterTest {
+    private BloomFilter<String> bloomFilter;
+
+    @BeforeEach
+    void setUp() {
+        bloomFilter = new BloomFilter<>(3, 100);
+    }
 
     @Test
-    public void test1() {
+    public void testIntegerContains() {
         BloomFilter<Integer> bloomFilter = new BloomFilter<>(3, 10);
         bloomFilter.insert(3);
         bloomFilter.insert(17);
@@ -16,12 +23,43 @@ public class BloomFilterTest {
     }
 
     @Test
-    public void test2() {
-        BloomFilter<String> bloomFilter = new BloomFilter<>(4, 20);
+    public void testStringContains() {
         bloomFilter.insert("omar");
         bloomFilter.insert("mahamid");
 
         Assertions.assertTrue(bloomFilter.contains("omar"));
         Assertions.assertTrue(bloomFilter.contains("mahamid"));
     }
+
+    @Test
+    void testInsertAndContains() {
+        bloomFilter.insert("hello");
+        bloomFilter.insert("world");
+
+        Assertions.assertTrue(bloomFilter.contains("hello"));
+        Assertions.assertTrue(bloomFilter.contains("world"));
+        Assertions.assertFalse(bloomFilter.contains("java"));
+    }
+
+    @Test
+    void testFalsePositive() {
+        bloomFilter.insert("apple");
+        bloomFilter.insert("banana");
+
+        Assertions.assertFalse(bloomFilter.contains("grape"));
+        Assertions.assertFalse(bloomFilter.contains("orange"));
+    }
+
+    @Test
+    void testMultipleInsertions() {
+        for (int i = 0; i < 100; i++) {
+            bloomFilter.insert("key" + i);
+        }
+
+        for (int i = 0; i < 100; i++) {
+            Assertions.assertTrue(bloomFilter.contains("key" + i));
+        }
+
+        Assertions.assertFalse(bloomFilter.contains("key" + 200));
+    }
 }