BAEL-838 Initial code showing how to remove last char - helper class and tests.

(cherry picked from commit d889dba)

core-java/src/main/java/com/baeldung/string/RemoveLastChar.java

@@ -0,0 +1,18 @@
+/**
+ * 
+ */
+package com.baeldung.string;
+
+/**
+ * @author iaforek
+ *
+ */
+public class RemoveLastChar {
+	public static String substring (String s) {
+		if (s == null || s.length() == 0) {
+			return null;
+		} else {
+			return (s.substring(0, s.length() - 1));
+		}
+	}
+}

core-java/src/test/java/com/baeldung/string/RemoveLastCharTest.java

@@ -0,0 +1,56 @@
+/**
+ * 
+ */
+package com.baeldung.string;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * @author iaforek
+ *
+ */
+public class RemoveLastCharTest {
+	
+	public static final String TEST_STRING = "abcdef";
+	public static final String NULL_STRING = null;
+	public static final String EMPTY_STRING = "";
+	public static final String ONE_CHAR_STRING = "a";
+	public static final String WHITE_SPACE_AT_THE_END_STRING = "abc ";
+
+	/**
+	 * Test method for {@link com.baeldung.string.RemoveLastChar#substring(java.lang.String)}.
+	 */
+	@Test
+	public void givenTestString_substring_getStingWithoutLastChar() {
+		Assert.assertEquals("abcde", RemoveLastChar.substring(TEST_STRING));
+		Assert.assertEquals("abcde", StringUtils.chop(TEST_STRING));
+	}
+	
+	@Test
+	public void givenNullString_substring_getNullString() {
+		Assert.assertEquals(NULL_STRING, RemoveLastChar.substring(NULL_STRING));
+		Assert.assertEquals(NULL_STRING, StringUtils.chop(NULL_STRING));
+
+	}
+
+	@Test
+	public void givenEmptyString_substring_getEmptyString() {
+		Assert.assertEquals(NULL_STRING, RemoveLastChar.substring(EMPTY_STRING));
+		Assert.assertEquals(NULL_STRING, StringUtils.chop(NULL_STRING));
+	}
+	
+	@Test
+	public void givenOneCharString_substring_getEmptyString() {
+		Assert.assertEquals(EMPTY_STRING, RemoveLastChar.substring(ONE_CHAR_STRING));
+		Assert.assertEquals(EMPTY_STRING, StringUtils.chop(ONE_CHAR_STRING));
+	}
+	
+	@Test
+	public void givenStringWithWhiteSpaceAtTheEnd_substring_getStringWithoutWhiteSpaceAtTheEnd() {
+		Assert.assertEquals("abc", RemoveLastChar.substring(WHITE_SPACE_AT_THE_END_STRING));
+		Assert.assertEquals("abc", StringUtils.chop(WHITE_SPACE_AT_THE_END_STRING));
+	}
+	
+}