Add tests for Single-schema items and unevaluatedItems

Resolves #291

Author: Relequestual

tests/draft2019-09/unevaluatedItems.json

@@ -0,0 +1,32 @@
+[
+  {
+      "description": "Single-schema items and unevaluatedItems",
+      "schema": {
+          "$schema": "https://json-schema.org/draft/2019-09/schema",
+          "unevaluatedItems": {"type": "boolean"},
+          "anyOf": [
+            {
+              "items": {"type": "string"}
+            },
+            true
+          ]
+      },
+      "tests": [
+          {
+              "description": "unevaluatedItems is applied",
+              "data": [true, false],
+              "valid": true
+          },
+          {
+              "description": "unevaluatedItems isn't applied unnecessarily on items annotation boolean of true",
+              "data": ["yes", "no"],
+              "valid": true
+          },
+          {
+              "description": "unevaluatedItems is applied on items annotation boolean false",
+              "data": ["yes", false],
+              "valid": false
+          }
+      ]
+  }
+]