Create SumOfOddNumbersTest.java

Author: BYT-Bender

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

@@ -0,0 +1,28 @@
+package com.thealgorithms.maths;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.stream.Stream;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+public class SumOfOddNumbersTest {
+
+    @ParameterizedTest
+    @MethodSource("inputStream")
+    void sumOfFirstNOddNumbersTests(int expected, int input) {
+        Assertions.assertEquals(expected, SumOfOddNumbers.sumOfFirstNOddNumbers(input));
+    }
+
+    private static Stream<Arguments> inputStream() {
+        return Stream.of(Arguments.of(1, 1), Arguments.of(4, 2), Arguments.of(9, 3), Arguments.of(16, 4), Arguments.of(25, 5), Arguments.of(100, 10));
+    }
+
+    @Test
+    public void testSumOfFirstNOddNumbersThrowsExceptionForNegativeInput() {
+        assertThrows(IllegalArgumentException.class, () -> SumOfOddNumbers.sumOfFirstNOddNumbers(-1));
+    }
+}