Fix clang-format: blank line between imports, single-line assertThrows

Author: InukaWijerathna

src/test/java/com/thealgorithms/maths/ReturnOnInvestmentTest.java

@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+
 import org.junit.jupiter.api.Test;
 
 public class ReturnOnInvestmentTest {
@@ -28,13 +29,11 @@ void testTotalLoss() {
 
     @Test
     void testZeroCostThrows() {
-        assertThrows(IllegalArgumentException.class,
-            () -> ReturnOnInvestment.returnOnInvestment(1000, 0));
+        assertThrows(IllegalArgumentException.class, () -> ReturnOnInvestment.returnOnInvestment(1000, 0));
     }
 
     @Test
     void testNegativeCostThrows() {
-        assertThrows(IllegalArgumentException.class,
-            () -> ReturnOnInvestment.returnOnInvestment(1000, -100));
+        assertThrows(IllegalArgumentException.class, () -> ReturnOnInvestment.returnOnInvestment(1000, -100));
     }
 }