write tests for methods in the FuzzySearching class

src/test/java/com/github/creme332/tests/utils/FuzzySearchingTest.java

@@ -0,0 +1,62 @@
+package com.github.creme332.tests.utils;
+
+import static org.junit.Assert.*;
+import org.junit.Test;
+import com.github.creme332.utils.FuzzySearching;
+
+public class FuzzySearchingTest {
+
+    @Test
+    public void testLevenshteinDistance() {
+        // Identical strings
+        assertEquals(0, FuzzySearching.levenshteinDistance("kitten", "kitten"));
+
+        // Completely different strings
+        assertEquals(6, FuzzySearching.levenshteinDistance("kitten", "puppy"));
+
+        // One empty string
+        assertEquals(6, FuzzySearching.levenshteinDistance("kitten", ""));
+        assertEquals(6, FuzzySearching.levenshteinDistance("", "kitten"));
+
+        // Strings differing by one character
+        assertEquals(1, FuzzySearching.levenshteinDistance("kitten", "sitten"));
+
+        // Strings of different lengths
+        assertEquals(3, FuzzySearching.levenshteinDistance("kitten", "kit"));
+    }
+
+    @Test
+    public void testIsSimilar() {
+        // Identical strings
+        assertTrue(FuzzySearching.isSimilar("kitten", "kitten"));
+
+        // Small difference (distance ≤ 3)
+        assertTrue(FuzzySearching.isSimilar("kitten", "sitten"));
+        assertTrue(FuzzySearching.isSimilar("kitten", "kitt"));
+
+        // Larger difference (distance > 3)
+        assertFalse(FuzzySearching.isSimilar("kitten", "puppy"));
+
+        // One empty string
+        assertFalse(FuzzySearching.isSimilar("kitten", ""));
+        assertFalse(FuzzySearching.isSimilar("", "kitten"));
+    }
+
+    @Test
+    public void testMatch() {
+        String[] keywords = {"kitten", "puppy", "dog"};
+
+        // Exact match
+        assertTrue(FuzzySearching.match("kitten", keywords));
+
+        // Similar match
+        assertTrue(FuzzySearching.match("kitt", keywords));
+
+        // No match
+        assertFalse(FuzzySearching.match("elephant", keywords));
+
+        // Case insensitivity
+        assertTrue(FuzzySearching.match("KITTEN", keywords));
+
+    }
+}