From 82ca2b8b92f811ade05f0f10817ea0ab53a8d6cd Mon Sep 17 00:00:00 2001
From: danielmcnally285 <144589379+danielmcnally285@users.noreply.github.com>
Date: Sat, 16 Mar 2024 12:23:28 +0000
Subject: [PATCH] last n characters from string unit tests

---
 .../LastNCharactersUnitTest.java              | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/lastncharacters/LastNCharactersUnitTest.java

diff --git a/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/lastncharacters/LastNCharactersUnitTest.java b/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/lastncharacters/LastNCharactersUnitTest.java
new file mode 100644
index 0000000000..1dd45b0d89
--- /dev/null
+++ b/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/lastncharacters/LastNCharactersUnitTest.java
@@ -0,0 +1,60 @@
+package com.baeldung.lastncharacters;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Arrays;
+import java.util.stream.Collectors;
+
+import org.apache.commons.lang3.ArrayUtils;
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class LastNCharactersUnitTest {
+
+    private String s;
+    private int n;
+
+    @Test
+    void givenString_whenUsingIntStreamAsStreamSource_thenObtainLastNCharacters() {
+        String result = s.chars()
+            .mapToObj(c -> (char) c)
+            .skip(s.length() - n)
+            .map(String::valueOf)
+            .collect(Collectors.joining());
+        assertThat(result).isEqualTo("2024");
+    }
+
+    @Test
+    void givenString_whenUsingOneArgSubstringMethod_thenObtainLastNCharacters() {
+        int beginIndex = s.length() - n;
+        assertThat(s.substring(beginIndex)).isEqualTo("2024");
+    }
+
+    @Test
+    void givenString_whenUsingStreamOfCharactersAsSource_thenObtainLastNCharacters() {
+        String result = Arrays.stream(ArrayUtils.toObject(s.toCharArray()))
+            .skip(s.length() - n)
+            .map(String::valueOf)
+            .collect(Collectors.joining());
+        assertThat(result).isEqualTo("2024");
+    }
+
+    @Test
+    void givenString_whenUsingStringUtilsRight_thenObtainLastNCharacters() {
+        assertThat(StringUtils.right(s, n)).isEqualTo("2024");
+    }
+
+    @Test
+    void givenString_whenUsingTwoArgSubstringMethod_thenObtainLastNCharacters() {
+        int beginIndex = s.length() - n;
+        String result = s.substring(beginIndex, s.length());
+        assertThat(result).isEqualTo("2024");
+    }
+
+    @BeforeEach
+    void init() {
+        s = "10-03-2024";
+        n = 4;
+    }
+}
\ No newline at end of file