Add indicator to vertically truncated lines

src/main/java/seedu/address/commons/util/StringUtil.java

@@ -116,6 +116,7 @@ public static String truncateText(String s) {
             String[] lines = s.split("\n");
             for (String line : lines) {
                 if (lineCount > TRUNCATED_LINE_NUMBER) {
+                    ans.append("...");
                     break;
                 }
                 if (line.length() > TRUNCATED_STRING_LENGTH) {

src/main/java/seedu/address/logic/Messages.java

@@ -13,9 +13,10 @@
  */
 public class Messages {
 
-    public static final String MESSAGE_UNKNOWN_COMMAND = "Unknown command";
+    public static final String MESSAGE_UNKNOWN_COMMAND = "Unknown command.\n"
+            + "Please type 'help' to see the list of available commands.";
     public static final String MESSAGE_INVALID_COMMAND_FORMAT = "Invalid command format! \n%1$s";
-    public static final String MESSAGE_INVALID_CLIENT_DISPLAYED_INDEX = "The client index provided is invalid";
+    public static final String MESSAGE_INVALID_CLIENT_DISPLAYED_INDEX = "The client index provided is invalid.";
     public static final String MESSAGE_CLIENTS_LISTED_OVERVIEW = "%1$d client(s) listed!";
     public static final String MESSAGE_DUPLICATE_FIELDS =
                 "Multiple values specified for the following single-valued field(s): ";

src/main/java/seedu/address/logic/commands/ListCommand.java

@@ -12,7 +12,7 @@ public class ListCommand extends Command {
 
     public static final String COMMAND_WORD = "list";
 
-    public static final String MESSAGE_SUCCESS = "Listed all clients";
+    public static final String MESSAGE_SUCCESS = "Listed all clients.";
 
 
     @Override

src/main/java/seedu/address/model/client/Address.java

@@ -9,7 +9,7 @@
  */
 public class Address {
 
-    public static final String MESSAGE_CONSTRAINTS = "Addresses can take any values, and it should not be blank";
+    public static final String MESSAGE_CONSTRAINTS = "Addresses can take any values, and it should not be blank.";
 
     /*
      * The first character of the address must not be a whitespace,

src/main/java/seedu/address/model/client/Name.java

@@ -11,7 +11,7 @@ public class Name {
 
     public static final String MESSAGE_CONSTRAINTS =
             "Names should only contain letters, numbers, spaces, hyphens, apostrophes (no symbols), "
-                    + "and it should not be blank";
+                    + "and it should not be blank.";
 
     /*
      * The first character of the address must not be a whitespace,

src/main/java/seedu/address/model/util/IncomeComparisonOperator.java

@@ -12,7 +12,7 @@
  */
 public class IncomeComparisonOperator {
     public static final String MESSAGE_CONSTRAINTS = "Please use a valid comparison operator. "
-            + "Income comparison operators can only be '=', '>' or '<'";
+            + "Income comparison operators can only be '=', '>' or '<'.";
 
     public final String comparisonOperator;
 

src/test/java/seedu/address/commons/util/StringUtilTest.java

@@ -159,7 +159,7 @@ public void truncateText() {
         assertFalse(StringUtil.truncateText(longTestString).equals(longTestString));
 
         // Truncated text will truncate if there are more than 3 newline characters
-        assertTrue(StringUtil.truncateText(fourNewLineTestString).equals(threeNewLineTestString));
+        assertTrue(StringUtil.truncateText(fourNewLineTestString).equals(threeNewLineTestString + "..."));
     }
 
 }