Fix bug where comma delimited list doesn't handle single item lists

src/main/java/com/botdarr/Config.java

@@ -173,8 +173,8 @@ private static StatusEndPoint getDomain(String constant, String name) {
     return null;
   }
 
-  private static List<String> getCommaDelimitedList(String list) {
-    if (!Strings.isEmpty(list) && list.contains(",")) {
+  protected static List<String> getCommaDelimitedList(String list) {
+    if (!Strings.isEmpty(list)) {
       if (list.contains(",")) {
         return Arrays.asList(list.split(","));
       } else {

src/main/resources/version.txt

@@ -1 +1 @@
-5.1.7
+5.1.8

src/test/java/com/botdarr/ConfigTests.java

@@ -1,6 +1,7 @@
 package com.botdarr;
 
 import mockit.Deencapsulation;
+import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -9,6 +10,8 @@
 
 import java.io.File;
 import java.io.FileOutputStream;
+import java.util.Collections;
+import java.util.List;
 import java.util.Properties;
 
 public class ConfigTests {
@@ -17,9 +20,34 @@ public void beforeEachTest() {
     Deencapsulation.setField(Config.class, "instance", null);
   }
 
+  @Test
+  public void getCommaDelimitedList_emptyItemsReturnEmptyList() {
+    Assert.assertEquals(Collections.emptyList(), Config.getCommaDelimitedList(""));
+  }
+
+  @Test
+  public void getCommaDelimitedList_nullItemsReturnEmptyList() {
+    Assert.assertEquals(Collections.emptyList(), Config.getCommaDelimitedList(null));
+  }
+
+  @Test
+  public void getCommaDelimitedList_singleItemReturnListWithItem() {
+    List<String> items = Config.getCommaDelimitedList("item1");
+    Assert.assertEquals(1, items.size());
+    Assert.assertEquals("item1", items.get(0));
+  }
+
+  @Test
+  public void getCommaDelimitedList_multipleItemsSplitByCommaReturnItemsInList() {
+    List<String> items = Config.getCommaDelimitedList("item1,item2");
+    Assert.assertEquals(2, items.size());
+    Assert.assertEquals("item1", items.get(0));
+    Assert.assertEquals("item2", items.get(1));
+  }
+
   @Test
   public void getConfig_invalidCommandPrefixConfigured() throws Exception {
-  Properties properties = new Properties();
+    Properties properties = new Properties();
     properties.put("discord-token", "#$F#$#");
     properties.put("discord-channels", "channel1");
     properties.put("command-prefix", "//");