Fix command tests issues.

src/test/java/seedu/todo/logic/commands/CompleteCommandTest.java

@@ -4,12 +4,15 @@
 
 import org.junit.Before;
 import org.junit.Test;
+import static org.hamcrest.Matchers.*;
 
 
 import seedu.todo.model.task.ImmutableTask;
 import seedu.todo.logic.commands.CompleteCommand;
 
 public class CompleteCommandTest extends CommandTest {
+    private static final String VERB_COMPLETE = "marked complete";
+    private static final String VERB_INCOMPLETE = "marked incomplete";
 
     @Override
     protected BaseCommand commandUnderTest() {
@@ -29,9 +32,7 @@ public void testMarkComplete() throws Exception {
         setParameter("3");
         execute(true);
         ImmutableTask markedComplete = getTaskAt(3);
-        assertEquals(result.getFeedback(), 
-                     command.taskSuccessfulResult(toMarkComplete.getTitle(), 
-                     "marked complete").getFeedback());
+        assertThat(result.getFeedback(), containsString(VERB_COMPLETE));
         assertEquals(markedComplete, toMarkComplete);
         assertTrue(toMarkComplete.isCompleted());
 
@@ -43,9 +44,7 @@ public void testMarkIncomplete() throws Exception {
         setParameter("1");
         execute(true);
         ImmutableTask markedIncomplete = getTaskAt(1);
-        assertEquals(result.getFeedback(), 
-                command.taskSuccessfulResult(toMarkIncomplete.getTitle(), 
-                "marked incomplete").getFeedback());
+        assertThat(result.getFeedback(), containsString(VERB_INCOMPLETE));
         assertEquals(markedIncomplete, toMarkIncomplete);
         assertFalse(toMarkIncomplete.isCompleted());
     }