imported test class from junit

Author: tejaswi0910

src/test/java/com/thealgorithms/dynamicprogramming/LongestArithmeticSubsequenceTest.java

@@ -4,6 +4,7 @@
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import java.util.stream.Stream;
+import org.junit.jupiter.api.Test;
 import org.apache.commons.lang3.ArrayUtils;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;