add assertions

nus-cs2103-AY2021S1 · Sep 9, 2020 · 0a4bb48 · 0a4bb48
1 parent 0177fda
commit 0a4bb48
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diff --git a/src/main/java/Duke.java b/src/main/java/Duke.java
@@ -11,10 +11,13 @@ public class Duke {
      */
     public static void main(String[] args) throws DukeException {
         TaskList tasks = Storage.read();
+        assert tasks != null : "error initializing tasks";
         UI ui = new UI();
+        assert ui != null : "error initializing UI";
         ui.welcome(tasks);
         String input = ui.getInput();
         Parser parser = new Parser(tasks);
+        assert ui != null : "error initializing parser";
         while (!input.equals("bye")) {
             try {
                 if (input.isEmpty()) {

diff --git a/src/main/java/Parser.java b/src/main/java/Parser.java
@@ -20,6 +20,7 @@ public Parser(TaskList tasks) {
      * @throws DukeException
      */
     void parse(String input) throws DukeException {
+        assert !input.isEmpty() : "error: input is null";
         String[] words = input.split(" ");
         String command = words[0];
         Task newTask;