Added failing subschema test

Author: dangoosby

test/nullable.test.js

@@ -17,6 +17,26 @@ it('adds `nullable: true` for `type: [string, null]`', () => {
 	});
 });
 
+
+it('supports nullables inside sub-schemas', () => {
+	const schema = {
+		$schema: 'http://json-schema.org/draft-04/schema#',
+		$oneOf: [
+			{ type: 'string' },
+			{ type: 'null' }
+		]
+	};
+
+	const result = convert(schema);
+
+	should(result).deepEqual({
+		$oneOf: [
+			{ type: 'string' },
+			{ nullable: true }
+		]	
+	});
+});
+
 it('does not add nullable for non null types', () => {
 	const schema = {
 		$schema: 'http://json-schema.org/draft-04/schema#',