Improve 'default' modifier, and add more test cases

Author: CodingCarlos

lib/modifiers/default.js

@@ -11,7 +11,7 @@ function modify(data, model) {
 		return data;
 	}
 
-	if (!data) {
+	if (!data && data !== false && data !== 0) {
 		return model.default;
 	}
 

spec/modifiers/default.spec.js

@@ -10,15 +10,43 @@ describe(' - Default modifier', () => {
 	});
 
 	it('shall not modify data when no model set', () => {
-		expect(valid('validData', {})).toEqual(null);
-		expect(valid(undefined, {})).toEqual(null);
+		expect(valid('validData', {})).toEqual('validData');
+		expect(valid(undefined, {})).toEqual(undefined);
 	});
 
 	it('shall not modify data if exists and model set', () => {
-		expect(valid('validData', model)).toEqual(null);
+		expect(valid('validData', model)).toEqual('validData');
 	});
 
-	it('shall return the default value when not data and model set', () => {
+	it('shall return the default value whith undefined as data and model set', () => {
 		expect(valid(undefined, model)).toEqual(model.default);
 	});
+
+	it('shall return "undefined" whith "undefined" (string) as data and model set', () => {
+		expect(valid('undefined', model)).toEqual('undefined');
+	});
+
+	it('shall return the default value with empty string (\'\') as data and model set', () => {
+		expect(valid('', model)).toEqual(model.default);
+	});
+
+	it('shall return the default value with null as data and model set', () => {
+		expect(valid(null, model)).toEqual(model.default);
+	});
+
+	it('shall return the default value with NaN as data and model set', () => {
+		expect(valid(NaN, model)).toEqual(model.default);
+	});
+
+	it('shall return false (boolean) with false (boolean) as data and model set', () => {
+		expect(valid(false, model)).toEqual(false);
+	});
+
+	it('shall return "false" (string) with "false" (string) as data and model set', () => {
+		expect(valid("false", model)).toEqual("false");
+	});
+
+	it('shall return 0 with 0 as data and model set', () => {
+		expect(valid(0, model)).toEqual(0);
+	});
 });