BAEL-5563 Reversing a number (#12153)

* BAEL-5563 Reverse a number initial commit * BAEL-5563 Final improvements before PR * BAEL-5563 Reverse a number - Draft improvements * BAEL-5563 Reverse a number - Recursive method improvements * BAEL-5563 Reverse a number - Recursive method improvements * BAEL-5563 Reverse a number - Remove unused imports Co-authored-by: Timothy Kruger - Lenny <gapptechnology@gmail.com> Co-authored-by: claud <180181@virtualwindow.co.za>
2022-05-12 13:52:54 +02:00
parent 0bbd9bdc64
commit 9727e555ce
2 changed files with 79 additions and 0 deletions
@@ -0,0 +1,34 @@
+package com.baeldung.reversenumber;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ReverseNumberUnitTest {
+
+    private static final int ORIGINAL_NUMBER = 123456789;
+    private static final int REVERSED_NUMBER = 987654321;
+
+    @Test
+    void whenReverseNumberWhileLoop_thenOriginalEqualToReverse() {
+        Assertions.assertThat(ReverseNumber.reverseNumberWhileLoop(ORIGINAL_NUMBER)).isEqualTo(REVERSED_NUMBER);
+    }
+
+    @Test
+    void whenReverseNumberForLoop_thenOriginalEqualToReverse() {
+        Assertions.assertThat(ReverseNumber.reverseNumberForLoop(ORIGINAL_NUMBER)).isEqualTo(REVERSED_NUMBER);
+    }
+
+    @Test
+    void whenReverseNumberRec_thenOriginalEqualToReverse() {
+        Assertions.assertThat(ReverseNumber.reverseNumberRecWrapper(ORIGINAL_NUMBER)).isEqualTo(REVERSED_NUMBER);
+    }
+
+    @Test
+    void whenReverseNegativeNumber_thenNumberShouldReverse() {
+        Assertions.assertThat(ReverseNumber.reverseNumberWhileLoop(ORIGINAL_NUMBER * -1)).isEqualTo(REVERSED_NUMBER * -1);
+        Assertions.assertThat(ReverseNumber.reverseNumberForLoop(ORIGINAL_NUMBER * -1)).isEqualTo(REVERSED_NUMBER * -1);
+        Assertions.assertThat(ReverseNumber.reverseNumberRecWrapper(ORIGINAL_NUMBER * -1)).isEqualTo(REVERSED_NUMBER * -1);
+    }
+}