DEV: Implementing Alternative String Arrange (#6551)

src/test/java/com/thealgorithms/strings/AlternativeStringArrangeTest.java

@@ -0,0 +1,23 @@
+package com.thealgorithms.strings;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class AlternativeStringArrangeTest {
+
+    // Method to provide test data
+    private static Stream<Object[]> provideTestData() {
+        return Stream.of(new Object[] {"abc", "12345", "a1b2c345"}, new Object[] {"abcd", "12", "a1b2cd"}, new Object[] {"", "123", "123"}, new Object[] {"abc", "", "abc"}, new Object[] {"a", "1", "a1"}, new Object[] {"ab", "12", "a1b2"}, new Object[] {"abcdef", "123", "a1b2c3def"},
+            new Object[] {"ab", "123456", "a1b23456"});
+    }
+
+    // Parameterized test using the provided test data
+    @ParameterizedTest(name = "{0} and {1} should return {2}")
+    @MethodSource("provideTestData")
+    void arrangeTest(String input1, String input2, String expected) {
+        assertEquals(expected, AlternativeStringArrange.arrange(input1, input2));
+    }
+}