Add WordPatternMatcher algorithm (#5627)

src/test/java/com/thealgorithms/backtracking/WordPatternMatcherTest.java

@@ -0,0 +1,40 @@
+package com.thealgorithms.backtracking;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+public class WordPatternMatcherTest {
+
+    @Test
+    public void testPatternMatchingSuccess() {
+        assertTrue(WordPatternMatcher.matchWordPattern("aba", "GraphTreesGraph"));
+        assertTrue(WordPatternMatcher.matchWordPattern("xyx", "PythonRubyPython"));
+    }
+
+    @Test
+    public void testPatternMatchingFailure() {
+        assertFalse(WordPatternMatcher.matchWordPattern("GG", "PythonJavaPython"));
+    }
+
+    @Test
+    public void testEmptyPatternAndString() {
+        assertTrue(WordPatternMatcher.matchWordPattern("", ""));
+    }
+
+    @Test
+    public void testEmptyPattern() {
+        assertFalse(WordPatternMatcher.matchWordPattern("", "nonempty"));
+    }
+
+    @Test
+    public void testEmptyString() {
+        assertFalse(WordPatternMatcher.matchWordPattern("abc", ""));
+    }
+
+    @Test
+    public void testLongerPatternThanString() {
+        assertFalse(WordPatternMatcher.matchWordPattern("abcd", "abc"));
+    }
+}