test: DebugTransformer file info output

README.md

@@ -5,6 +5,7 @@ Roblox CSharp to Lua compiler
 
 # To-do
 - Test `DebugTransformer`
+- Macro any method that takes an instance name and returns that instance (`FindFirstChild`, etc.)
 - Imports
 - Inheritance chains 🤮
 - Append ` = null` to generated nullable properties

RobloxCS.Tests/DebugTransformer_Should.cs

@@ -0,0 +1,50 @@
+namespace RobloxCS.Tests
+{
+    public class DebugTransformer_Should
+    {
+        [Theory]
+        [InlineData("Console.WriteLine(\"hello baby\")")]
+        [InlineData("Console.Write(\"hello baby\")")]
+        [InlineData("warn(\"hello baby\")")]
+        public void FileInfo_PrependsArgument(string input)
+        {
+            var cleanTree = TranspilerUtility.ParseTree(input);
+            var transformedTree = TranspilerUtility.TransformTree(cleanTree, [TransformFactory.Main(), TransformFactory.Debug()]);
+            var cleanRoot = cleanTree.GetRoot();
+            var cleanInvocation = cleanRoot.DescendantNodes().OfType<InvocationExpressionSyntax>().First();
+            var transformedRoot = transformedTree.GetRoot();
+            var transformedInvocation = transformedRoot.DescendantNodes().OfType<InvocationExpressionSyntax>().First();
+            var cleanArgs = cleanInvocation.ArgumentList.Arguments;
+            var transformedArgs = transformedInvocation.ArgumentList.Arguments;
+            var fileInfoArg = transformedArgs.FirstOrDefault();
+            Assert.True(cleanArgs.Count == 1);
+            Assert.True(transformedArgs.Count == 2);
+            Assert.NotNull(fileInfoArg);
+
+            var fileInfoLiteral = (LiteralExpressionSyntax)fileInfoArg.Expression;
+            Assert.Equal($"[TestFile.cs:1:13]:", fileInfoLiteral.Token.ValueText);
+        }
+
+        [Theory]
+        [InlineData("error(\"hello baby\")")]
+        public void FileInfo_ConcatenatesLiteral(string input)
+        {
+            var cleanTree = TranspilerUtility.ParseTree(input);
+            var transformedTree = TranspilerUtility.TransformTree(cleanTree, [TransformFactory.Main(), TransformFactory.Debug()]);
+            var cleanRoot = cleanTree.GetRoot();
+            var cleanInvocation = cleanRoot.DescendantNodes().OfType<InvocationExpressionSyntax>().First();
+            var transformedRoot = transformedTree.GetRoot();
+            var transformedInvocation = transformedRoot.DescendantNodes().OfType<InvocationExpressionSyntax>().First();
+            var cleanArgs = cleanInvocation.ArgumentList.Arguments;
+            var transformedArgs = transformedInvocation.ArgumentList.Arguments;
+            var fullMessageArg = transformedArgs.FirstOrDefault();
+            Assert.True(cleanArgs.Count == 1);
+            Assert.True(transformedArgs.Count == 1);
+            Assert.NotNull(fullMessageArg);
+
+            var fullMessageBinary= (BinaryExpressionSyntax)fullMessageArg.Expression;
+            var fileInfoLiteral = (LiteralExpressionSyntax)fullMessageBinary.Left;
+            Assert.Equal("[TestFile.cs:1:13]: ", fileInfoLiteral.Token.ValueText);
+        }
+    }
+}

RobloxCS/TranspilerUtility.cs

@@ -49,7 +49,7 @@ public static SyntaxTree TransformTree(SyntaxTree cleanTree, List<Func<SyntaxTre
             return tree;
         }
 
-        public static SyntaxTree ParseTree(string source, string sourceFile = "TransformerTestFile.cs")
+        public static SyntaxTree ParseTree(string source, string sourceFile = "TestFile.cs")
         {
             var cleanTree = CSharpSyntaxTree.ParseText(source);
             var compilationUnit = (CompilationUnitSyntax)cleanTree.GetRoot();