fixes #224 support boolean schema for the item validator

Author: stevehu

src/main/java/com/networknt/schema/ItemsValidator.java

@@ -37,7 +37,7 @@ public class ItemsValidator extends BaseJsonValidator implements JsonValidator {
 
     public ItemsValidator(String schemaPath, JsonNode schemaNode, JsonSchema parentSchema, ValidationContext validationContext) {
         super(schemaPath, schemaNode, parentSchema, ValidatorTypeCode.ITEMS, validationContext);
-        if (schemaNode.isObject()) {
+        if (schemaNode.isObject() || schemaNode.isBoolean()) {
             schema = new JsonSchema(validationContext, getValidatorType().getValue(), parentSchema.getCurrentUri(), schemaNode, parentSchema);
         } else {
             tupleSchema = new ArrayList<JsonSchema>();

src/test/java/com/networknt/schema/V201909JsonSchemaTest.java

@@ -314,7 +314,6 @@ public void testIfThenElseValidator() throws Exception {
     }
 
     @Test
-    @Ignore
     public void testItemsValidator() throws Exception {
         runTestFile("draft2019-09/items.json");
     }

src/test/java/com/networknt/schema/V6JsonSchemaTest.java

@@ -203,7 +203,6 @@ public void testFormatValidator() throws Exception {
     }
 
     @Test
-    @Ignore
     public void testItemsValidator() throws Exception {
         runTestFile("draft6/items.json");
     }

src/test/java/com/networknt/schema/V7JsonSchemaTest.java

@@ -310,7 +310,6 @@ public void testIfThenElseValidator() throws Exception {
     }
 
     @Test
-    @Ignore
     public void testItemsValidator() throws Exception {
         runTestFile("draft7/items.json");
     }