From 679018cbd3fd6e98bae6ae60d64cb6353ad484cf Mon Sep 17 00:00:00 2001
From: alxkm <alexanderklmn@gmail.com>
Date: Mon, 14 Jul 2025 19:19:43 +0200
Subject: [PATCH 1/2] testing: add more cases for AverageTest

---
 .../com/thealgorithms/maths/AverageTest.java  | 44 ++++++++++++-------
 1 file changed, 29 insertions(+), 15 deletions(-)

diff --git a/src/test/java/com/thealgorithms/maths/AverageTest.java b/src/test/java/com/thealgorithms/maths/AverageTest.java
index c5c751938f5d..4e9fb98b68cb 100644
--- a/src/test/java/com/thealgorithms/maths/AverageTest.java
+++ b/src/test/java/com/thealgorithms/maths/AverageTest.java
@@ -1,33 +1,47 @@
 package com.thealgorithms.maths;
 
-import org.junit.jupiter.api.Assertions;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
 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;
+import java.util.stream.Stream;
 
 public class AverageTest {
 
     private static final double SMALL_VALUE = 0.00001d;
 
-    @Test
-    public void testAverageDouble12() {
-        double[] numbers = {3d, 6d, 9d, 12d, 15d, 18d, 21d};
-        Assertions.assertEquals(12d, Average.average(numbers), SMALL_VALUE);
+    @ParameterizedTest(name = "average({0}) should be approximately {1}")
+    @MethodSource("provideDoubleArrays")
+    void testAverageDouble(double[] numbers, double expected) {
+        assertEquals(expected, Average.average(numbers), SMALL_VALUE);
     }
 
-    @Test
-    public void testAverageDouble20() {
-        double[] numbers = {5d, 10d, 15d, 20d, 25d, 30d, 35d};
-        Assertions.assertEquals(20d, Average.average(numbers), SMALL_VALUE);
+    @ParameterizedTest(name = "average({0}) should be {1}")
+    @MethodSource("provideIntArrays")
+    void testAverageInt(int[] numbers, long expected) {
+        assertEquals(expected, Average.average(numbers));
     }
 
     @Test
-    public void testAverageDouble() {
-        double[] numbers = {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d};
-        Assertions.assertEquals(4.5d, Average.average(numbers), SMALL_VALUE);
+    void testAverageDoubleThrowsExceptionOnNullOrEmpty() {
+        assertThrows(IllegalArgumentException.class, () -> Average.average((double[]) null));
+        assertThrows(IllegalArgumentException.class, () -> Average.average(new double[0]));
     }
 
     @Test
-    public void testAverageInt() {
-        int[] numbers = {2, 4, 10};
-        Assertions.assertEquals(5, Average.average(numbers));
+    void testAverageIntThrowsExceptionOnNullOrEmpty() {
+        assertThrows(IllegalArgumentException.class, () -> Average.average((int[]) null));
+        assertThrows(IllegalArgumentException.class, () -> Average.average(new int[0]));
+    }
+
+    private static Stream<Arguments> provideDoubleArrays() {
+        return Stream.of(Arguments.of(new double[] {3d, 6d, 9d, 12d, 15d, 18d, 21d}, 12d), Arguments.of(new double[] {5d, 10d, 15d, 20d, 25d, 30d, 35d}, 20d), Arguments.of(new double[] {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d}, 4.5d), Arguments.of(new double[] {0d, 0d, 0d}, 0d), Arguments.of(new double[] {-1d, -2d, -3d}, -2d), Arguments.of(new double[] {1e-10, 1e-10, 1e-10}, 1e-10));
+    }
+
+    private static Stream<Arguments> provideIntArrays() {
+        return Stream.of(Arguments.of(new int[] {2, 4, 10}, 5L), Arguments.of(new int[] {0, 0, 0}, 0L), Arguments.of(new int[] {-1, -2, -3}, -2L), Arguments.of(new int[] {1, 1, 1, 1, 1}, 1L));
     }
 }

From ba93a8a381ecb7bc9fb7826159c8ad0aef954ab1 Mon Sep 17 00:00:00 2001
From: alxkm <alexanderklmn@gmail.com>
Date: Mon, 14 Jul 2025 19:22:12 +0200
Subject: [PATCH 2/2] checkstyle: fix formatting

---
 src/test/java/com/thealgorithms/maths/AverageTest.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/test/java/com/thealgorithms/maths/AverageTest.java b/src/test/java/com/thealgorithms/maths/AverageTest.java
index 4e9fb98b68cb..638739bc4fda 100644
--- a/src/test/java/com/thealgorithms/maths/AverageTest.java
+++ b/src/test/java/com/thealgorithms/maths/AverageTest.java
@@ -3,11 +3,11 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
+import java.util.stream.Stream;
 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;
-import java.util.stream.Stream;
 
 public class AverageTest {
 
@@ -38,7 +38,8 @@ void testAverageIntThrowsExceptionOnNullOrEmpty() {
     }
 
     private static Stream<Arguments> provideDoubleArrays() {
-        return Stream.of(Arguments.of(new double[] {3d, 6d, 9d, 12d, 15d, 18d, 21d}, 12d), Arguments.of(new double[] {5d, 10d, 15d, 20d, 25d, 30d, 35d}, 20d), Arguments.of(new double[] {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d}, 4.5d), Arguments.of(new double[] {0d, 0d, 0d}, 0d), Arguments.of(new double[] {-1d, -2d, -3d}, -2d), Arguments.of(new double[] {1e-10, 1e-10, 1e-10}, 1e-10));
+        return Stream.of(Arguments.of(new double[] {3d, 6d, 9d, 12d, 15d, 18d, 21d}, 12d), Arguments.of(new double[] {5d, 10d, 15d, 20d, 25d, 30d, 35d}, 20d), Arguments.of(new double[] {1d, 2d, 3d, 4d, 5d, 6d, 7d, 8d}, 4.5d), Arguments.of(new double[] {0d, 0d, 0d}, 0d),
+            Arguments.of(new double[] {-1d, -2d, -3d}, -2d), Arguments.of(new double[] {1e-10, 1e-10, 1e-10}, 1e-10));
     }
 
     private static Stream<Arguments> provideIntArrays() {

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