AST printer

Author: mkmarek

src/GraphQLParser.Tests/AssertExtensions.cs

@@ -0,0 +1,29 @@
+namespace GraphQLParser.Tests
+{
+    using KellermanSoftware.CompareNetObjects;
+    using System;
+
+    public static class AssertExtensions
+    {
+        public static void DeepEqual<T>(T obj1, T obj2, params Type[] typesToIgnore)
+        {
+            var compareLogic = new CompareLogic();
+
+            if (typesToIgnore != null)
+            {
+                foreach (var type in typesToIgnore)
+                {
+                    compareLogic.Config.TypesToIgnore.Add(type);
+                }
+            }
+
+            var result = compareLogic.Compare(obj1, obj2);
+
+            if (!result.AreEqual)
+                throw new Exception(
+                    "Objects are not the same: " +
+                    Environment.NewLine + Environment.NewLine +
+                    result.DifferencesString);
+        }
+    }
+}

src/GraphQLParser.Tests/GraphQLParser.Tests.csproj

@@ -23,6 +23,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="CompareNETObjects" Version="4.55.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
     <PackageReference Include="xunit" Version="2.3.0-beta1-build3642" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0-beta1-build1309" />

src/GraphQLParser.Tests/ParserTests.cs

@@ -152,7 +152,7 @@ private static ASTNode GetSingleSelection(GraphQLDocument document)
             return GetSingleOperationDefinition(document).SelectionSet.Selections.Single();
         }
 
-        private static string LoadKitchenSink()
+        public static string LoadKitchenSink()
         {
             return @"# Copyright (c) 2015, Facebook, Inc.
 # All rights reserved.

src/GraphQLParser.Tests/PrinterTests.cs

@@ -0,0 +1,32 @@
+namespace GraphQLParser.Tests
+{
+    using GraphQLParser.AST;
+    using Xunit;
+
+    public class PrinterTests
+    {
+        private Printer printer;
+
+        public PrinterTests()
+        {
+            this.printer = new Printer();
+        }
+
+        [Fact]
+        public void Print_KitchenSink_DoesNotModifyAST()
+        {
+            var ast = this.Parse(ParserTests.LoadKitchenSink());
+            var printed = this.printer.Print(ast);
+            var ast2 = this.Parse(printed);
+
+            AssertExtensions.DeepEqual(ast, ast2, typeof(GraphQLLocation));
+        }
+
+        private GraphQLDocument Parse(string body)
+        {
+            var parser = new Parser(new Lexer());
+
+            return parser.Parse(new Source(body));
+        }
+    }
+}