Unit test for this case

Codestyle fixes

src/core.js

@@ -678,8 +678,7 @@ jQuery.extend({
 	},
 
 	inArray: function( elem, array ) {
-		if (!jQuery.isArray(array))
-		{
+		if ( !array ) {
 			return -1;
 		}
 

test/unit/core.js

@@ -916,6 +916,16 @@ test("jQuery.makeArray", function(){
 	same( jQuery.makeArray({length: "5"}), [], "Make sure object is coerced properly.");
 });
 
+test("jQuery.inArray", function(){
+	expect(3);
+
+	equals( jQuery.inArray( 0, false ), -1 , "Search in 'false' as array returns -1 and doesn't throw exception" );
+
+	equals( jQuery.inArray( 0, null ), -1 , "Search in 'null' as array returns -1 and doesn't throw exception" );
+
+	equals( jQuery.inArray( 0, undefined ), -1 , "Search in 'undefined' as array returns -1 and doesn't throw exception" );
+});
+
 test("jQuery.isEmptyObject", function(){
 	expect(2);