Core: Trigger success on optional but have other successful validators

The comment in the code itself says "when there are no other rules" but does
nothing to enforce that comment.

Fixes gh-851
Closes gh-852

src/core.js

@@ -552,6 +552,9 @@ $.extend($.validator, {
 			element = this.validationTargetFor( this.clean( element ) );
 
 			var rules = $(element).rules();
+			var rulesCount = $.map( rules, function(n, i) {
+				return i;
+			}).length;
 			var dependencyMismatch = false;
 			var val = this.elementValue(element);
 			var result;
@@ -564,7 +567,7 @@ $.extend($.validator, {
 
 					// if a method indicates that the field is optional and therefore valid,
 					// don't mark it as valid when there are no other rules
-					if ( result === "dependency-mismatch" ) {
+					if ( result === "dependency-mismatch" && rulesCount === 1 ) {
 						dependencyMismatch = true;
 						continue;
 					}

test/test.js

@@ -902,7 +902,8 @@ test("successlist", function() {
 	equal(0, v.successList.length);
 });
 
-test("success isn't called for optional elements", function() {
+
+test("success isn't called for optional elements with no other rules", function() {
 	expect(4);
 	equal( "", $("#firstname").removeAttr("data-rule-required").removeAttr("data-rule-minlength").val() );
 	$("#something").remove();
@@ -913,7 +914,7 @@ test("success isn't called for optional elements", function() {
 			ok( false, "don't call success for optional elements!" );
 		},
 		rules: {
-			firstname: "email"
+			firstname: { required: false }
 		}
 	});
 	equal( 0, $("#testForm1 label").size() );
@@ -923,6 +924,31 @@ test("success isn't called for optional elements", function() {
 	equal( 0, $("#testForm1 label").size() );
 });
 
+test("success is called for optional elements with other rules", function() {
+	expect(1);
+
+	$.validator.addMethod("custom1", function() {
+		return true;
+	}, "");
+
+	var v = $("#testForm1clean").validate({
+		success: function() {
+			ok( true, "success called correctly!" );
+		},
+		rules: {
+			firstname: {
+				required: false,
+				custom1: true
+			}
+		}
+	});
+
+	$("#firstnamec").valid();
+
+	delete $.validator.methods.custom1;
+});
+
+
 test("success callback with element", function() {
 	expect(1);
 	var v = $("#userForm").validate({