@@ -99,6 +99,7 @@ public void whenFiltersWithoutOptional_thenCorrect() {
         assertFalse(priceIsInRange1(new Modem(9.9)));
         assertFalse(priceIsInRange1(new Modem(null)));
         assertFalse(priceIsInRange1(new Modem(15.5)));
+        assertFalse(priceIsInRange1(null));
 
     }
 
@@ -108,6 +109,7 @@ public void whenFiltersWithOptional_thenCorrect() {
         assertFalse(priceIsInRange2(new Modem(9.9)));
         assertFalse(priceIsInRange2(new Modem(null)));
         assertFalse(priceIsInRange2(new Modem(15.5)));
+        assertFalse(priceIsInRange1(null));
     }
 
     public boolean priceIsInRange1(Modem modem) {
Original file line number	Diff line number	Diff line change
`@@ -99,6 +99,7 @@ public void whenFiltersWithoutOptional_thenCorrect() {`
`99`	`99`	`assertFalse(priceIsInRange1(new Modem(9.9)));`
`100`	`100`	`assertFalse(priceIsInRange1(new Modem(null)));`
`101`	`101`	`assertFalse(priceIsInRange1(new Modem(15.5)));`
	`102`	`+ assertFalse(priceIsInRange1(null));`
`102`	`103`
`103`	`104`	`}`
`104`	`105`
`@@ -108,6 +109,7 @@ public void whenFiltersWithOptional_thenCorrect() {`
`108`	`109`	`assertFalse(priceIsInRange2(new Modem(9.9)));`
`109`	`110`	`assertFalse(priceIsInRange2(new Modem(null)));`
`110`	`111`	`assertFalse(priceIsInRange2(new Modem(15.5)));`
	`112`	`+ assertFalse(priceIsInRange1(null));`
`111`	`113`	`}`
`112`	`114`
`113`	`115`	`public boolean priceIsInRange1(Modem modem) {`