Disallow empty WeekdayLists

app/src/main/java/org/isoron/uhabits/models/WeekdayList.java

@@ -29,9 +29,10 @@ public class WeekdayList
 
     public WeekdayList(int packedList)
     {
+        if(packedList == 0) packedList = 127;
         weekdays = new boolean[7];
-        int current = 1;
 
+        int current = 1;
         for (int i = 0; i < 7; i++)
         {
             if ((packedList & current) != 0) weekdays[i] = true;
@@ -41,6 +42,10 @@ public class WeekdayList
 
     public WeekdayList(boolean weekdays[])
     {
+        boolean isEmpty = true;
+        for(boolean b : weekdays) if(b) isEmpty = false;
+        if(isEmpty) throw new IllegalArgumentException("empty list");
+
         this.weekdays = Arrays.copyOf(weekdays, 7);
     }
 

app/src/test/java/org/isoron/uhabits/models/WeekdayListTest.java

@@ -43,4 +43,11 @@ public class WeekdayListTest extends BaseUnitTest
         assertThat(list.toArray(), equalTo(daysArray));
         assertThat(list.toInteger(), equalTo(daysInt));
     }
+
+    @Test
+    public void testEmpty()
+    {
+        WeekdayList list = new WeekdayList(0);
+        assertThat(list.toArray(), equalTo(WeekdayList.EVERY_DAY.toArray()));
+    }
 }