Adds tests for DisableIntrospection Validation rule

tests/Validator/DisableIntrospectionTest.php

@@ -0,0 +1,128 @@
+<?php
+namespace GraphQL\Tests\Validator;
+
+use GraphQL\Error\FormattedError;
+use GraphQL\Language\SourceLocation;
+use GraphQL\Validator\Rules\DisableIntrospection;
+
+class DisableIntrospectionTest extends TestCase
+{
+    // Validate: Disable Introspection
+
+    /**
+     * @it fails if the query contains __schema
+     */
+    public function testQueryContainsSchema()
+    {
+        $this->expectFailsRule(new DisableIntrospection(DisableIntrospection::ENABLED), '
+      query { 
+        __schema {
+          queryType {
+            name
+          }
+        }
+      }
+        ',
+            [$this->error(3, 9)] 
+        );
+    }
+    
+    /**
+     * @it fails if the query contains __type
+     */
+    public function testQueryContainsType()
+    {
+        $this->expectFailsRule(new DisableIntrospection(DisableIntrospection::ENABLED), '
+      query { 
+        __type(
+          name: "Query"
+        ){
+          name
+        }
+      }
+        ',
+            [$this->error(3, 9)]
+        );
+    }
+
+    /**
+     * @it does not fail on a query that does not contain __type
+     */
+    public function testValidQuery()
+    {
+        $this->expectPassesRule(new DisableIntrospection(DisableIntrospection::ENABLED), '
+      query {
+        user {
+          name
+          email
+          friends {
+            name
+          }
+        }
+      }
+        ');
+    }
+
+    /**
+     * @it does not fail when not enabled
+     */
+    public function testQueryWhenDisabled()
+    {
+        $this->expectPassesRule(new DisableIntrospection(DisableIntrospection::DISABLED), '
+      query { 
+        __type(
+          name: "Query"
+        ){
+          name
+        }
+      }
+        ');
+    }
+
+    /**
+     * @it has a public interface for enabeling the rule
+     */
+    public function testPublicEnableInterface()
+    {
+        $disableIntrospection = new DisableIntrospection(DisableIntrospection::DISABLED);
+        $disableIntrospection->setEnabled(DisableIntrospection::ENABLED);
+        $this->expectFailsRule($disableIntrospection, '
+      query { 
+        __type(
+          name: "Query"
+        ){
+          name
+        }
+      }
+        ',
+            [$this->error(3, 9)]
+        );
+    }
+
+    /**
+     * @it has a public interface for disableing the rule
+     */
+    public function testPublicDisableInterface()
+    {
+        $disableIntrospection = new DisableIntrospection(DisableIntrospection::ENABLED);
+        $disableIntrospection->setEnabled(DisableIntrospection::DISABLED);
+        $this->expectPassesRule($disableIntrospection, '
+      query { 
+        __type(
+          name: "Query"
+        ){
+          name
+        }
+      }
+        ');
+    }
+
+
+    private function error($line, $column)
+    {
+        return FormattedError::create(
+            DisableIntrospection::introspectionDisabledMessage(),
+            [ new SourceLocation($line, $column) ]
+        );
+    }
+}