diff --git a/angry b/angry
new file mode 100644
index 00000000..e69de29b
diff --git a/file b/file
new file mode 100644
index 00000000..e69de29b
diff --git a/src/arkreactor/Error/Diagnostics.cpp b/src/arkreactor/Error/Diagnostics.cpp
index e90918ee..2f47b13f 100644
--- a/src/arkreactor/Error/Diagnostics.cpp
+++ b/src/arkreactor/Error/Diagnostics.cpp
@@ -65,7 +65,9 @@ namespace Ark::Diagnostics
         else if (maybe_context && !ctx_same_file && !maybe_context->filename.empty())
         {
             // show the location of the parent of our error first
-            fmt::print(os, "Error originated from file {}:{}\n", maybe_context->filename, maybe_context->at.start.line + 1);
+            std::string uniformised_filename;
+            std::ranges::replace_copy(maybe_context->filename, std::back_inserter(uniformised_filename), '\\', '/');
+            fmt::print(os, "Error originated from file {}:{}\n", uniformised_filename, maybe_context->at.start.line + 1);
 
             std::optional<decltype(internal::FilePos::line)> maybe_end_line = std::nullopt;
             if (maybe_context->at.end)
@@ -193,9 +195,11 @@ namespace Ark::Diagnostics
                 const std::string& filename, const internal::FileSpan& at,
                 const std::optional<CodeErrorContext>& maybe_context = std::nullopt)
     {
+        std::string uniformised_filename;
+        std::ranges::replace_copy(filename, std::back_inserter(uniformised_filename), '\\', '/');
         makeContext(
             ErrorLocation {
-                .filename = filename,
+                .filename = uniformised_filename,
                 .start = at.start,
                 .end = at.end },
             os, maybe_context, colorize);
diff --git a/tests/unittests/Suites/CompilerSuite.cpp b/tests/unittests/Suites/CompilerSuite.cpp
index 464e7949..3e5934f4 100644
--- a/tests/unittests/Suites/CompilerSuite.cpp
+++ b/tests/unittests/Suites/CompilerSuite.cpp
@@ -81,7 +81,7 @@ ut::suite<"Compiler"> compiler_suite = [] {
 
         iterTestFiles(
             "CompilerSuite/ir",
-            [](TestData&& data) {
+            [](const TestData& data) {
                 Ark::Welder welder(0, { lib_path }, features);
 
                 should("compile without error ir/" + data.stem) = [&] {
@@ -103,7 +103,7 @@ ut::suite<"Compiler"> compiler_suite = [] {
 
         iterTestFiles(
             "CompilerSuite/optimized_ir",
-            [](TestData&& data) {
+            [](const TestData& data) {
                 Ark::Welder welder(0, { lib_path }, features);
 
                 should("compile without error optimized_ir/" + data.stem) = [&] {
diff --git a/tests/unittests/Suites/DiagnosticsSuite.cpp b/tests/unittests/Suites/DiagnosticsSuite.cpp
index 6c6a96cb..64c145e8 100644
--- a/tests/unittests/Suites/DiagnosticsSuite.cpp
+++ b/tests/unittests/Suites/DiagnosticsSuite.cpp
@@ -14,7 +14,7 @@ ut::suite<"Diagnostics"> diagnostics_suite = [] {
 
     iterTestFiles(
         "DiagnosticsSuite/compileTime",
-        [](TestData&& data) {
+        [](const TestData& data) {
             Ark::State state({ lib_path });
 
             should("generate an error message at compile time for compileTime/" + data.stem) = [&] {
@@ -36,7 +36,7 @@ ut::suite<"Diagnostics"> diagnostics_suite = [] {
 
     iterTestFiles(
         "DiagnosticsSuite/runtime",
-        [](TestData&& data) {
+        [](const TestData& data) {
             Ark::State state({ lib_path });
 
             should("compile without error runtime/" + data.stem) = [&] {
@@ -62,7 +62,7 @@ ut::suite<"Diagnostics"> diagnostics_suite = [] {
 
     iterTestFiles(
         "DiagnosticsSuite/typeChecking",
-        [](TestData&& data) {
+        [](const TestData& data) {
             Ark::State state({ lib_path });
 
             should("compile without error typeChecking/" + data.stem) = [&] {
diff --git a/tests/unittests/Suites/FormatterSuite.cpp b/tests/unittests/Suites/FormatterSuite.cpp
index 92d1eb19..c04cf0eb 100644
--- a/tests/unittests/Suites/FormatterSuite.cpp
+++ b/tests/unittests/Suites/FormatterSuite.cpp
@@ -11,7 +11,7 @@ ut::suite<"Formatter"> formatter_suite = [] {
 
     iterTestFiles(
         "FormatterSuite",
-        [](TestData&& data) {
+        [](const TestData& data) {
             std::string formatted_code;
 
             should("output a correctly formatted code for " + data.stem) = [&] {
diff --git a/tests/unittests/Suites/OptimizerSuite.cpp b/tests/unittests/Suites/OptimizerSuite.cpp
index 630b62fd..11ea619c 100644
--- a/tests/unittests/Suites/OptimizerSuite.cpp
+++ b/tests/unittests/Suites/OptimizerSuite.cpp
@@ -13,7 +13,7 @@ ut::suite<"Optimizer"> optimizer_suite = [] {
     "[generate optimized ast]"_test = [] {
         iterTestFiles(
             "OptimizerSuite",
-            [](TestData&& data) {
+            [](const TestData& data) {
                 JsonCompiler compiler(false, { lib_path }, Ark::FeatureASTOptimizer);
 
                 std::string json;
diff --git a/tests/unittests/Suites/ParserSuite.cpp b/tests/unittests/Suites/ParserSuite.cpp
index 0a518aeb..e02090e5 100644
--- a/tests/unittests/Suites/ParserSuite.cpp
+++ b/tests/unittests/Suites/ParserSuite.cpp
@@ -46,7 +46,7 @@ ut::suite<"Parser"> parser_suite = [] {
     "[successful parsing]"_test = [] {
         iterTestFiles(
             "ParserSuite/success",
-            [](TestData&& data) {
+            [](const TestData& data) {
                 Ark::internal::Parser parser(/* debug= */ 0);
 
                 should("parse " + data.stem) = [&] {
@@ -68,7 +68,7 @@ ut::suite<"Parser"> parser_suite = [] {
     "[error reporting]"_test = [] {
         iterTestFiles(
             "ParserSuite/failure",
-            [](TestData&& data) {
+            [](const TestData& data) {
                 try
                 {
                     Ark::internal::Parser parser(/* debug= */ 0);
diff --git a/tests/unittests/Suites/RosettaSuite.cpp b/tests/unittests/Suites/RosettaSuite.cpp
index 7bf9a1f7..76e6f33c 100644
--- a/tests/unittests/Suites/RosettaSuite.cpp
+++ b/tests/unittests/Suites/RosettaSuite.cpp
@@ -13,7 +13,7 @@ ut::suite<"Rosetta"> rosetta_suite = [] {
     "[run arkscript rosetta code solutions]"_test = [] {
         iterTestFiles(
             "RosettaSuite",
-            [](TestData&& data) {
+            [](const TestData&data) {
                 Ark::State state({ lib_path });
 
                 should("compile " + data.stem) = [&] {
diff --git a/tests/unittests/Suites/TypeCheckerSuite.cpp b/tests/unittests/Suites/TypeCheckerSuite.cpp
index 96330e85..bc9bdb9c 100644
--- a/tests/unittests/Suites/TypeCheckerSuite.cpp
+++ b/tests/unittests/Suites/TypeCheckerSuite.cpp
@@ -177,7 +177,7 @@ ut::suite<"TypeChecker"> type_checker_suite = [] {
 
     iterTestFiles(
         "TypeCheckerSuite",
-        [&](TestData&& data) {
+        [&](const TestData& data) {
             std::vector<Input> inputs;
             std::vector<Ark::types::Contract> contracts;
 
@@ -185,7 +185,7 @@ ut::suite<"TypeChecker"> type_checker_suite = [] {
             {
                 iterTestFiles(
                     data.path,
-                    [&inputs](TestData&& inner) {
+                    [&inputs](const TestData& inner) {
                         const Input input = parse_input(inner.path);
                         expect(fatal(input.initialized)) << "invalid test input: " << inner.stem;
                         inputs.push_back(input);
diff --git a/tests/unittests/Suites/ValidAstSuite.cpp b/tests/unittests/Suites/ValidAstSuite.cpp
index e74b7f69..4678995a 100644
--- a/tests/unittests/Suites/ValidAstSuite.cpp
+++ b/tests/unittests/Suites/ValidAstSuite.cpp
@@ -13,7 +13,7 @@ ut::suite<"AST"> ast_suite = [] {
     "[generate valid ast]"_test = [] {
         iterTestFiles(
             "ASTSuite",
-            [](TestData&& data) {
+            [](const TestData& data) {
                 JsonCompiler compiler(false, { lib_path });
 
                 std::string json;
diff --git a/tests/unittests/TestsHelper.cpp b/tests/unittests/TestsHelper.cpp
index 648229df..74e28a60 100644
--- a/tests/unittests/TestsHelper.cpp
+++ b/tests/unittests/TestsHelper.cpp
@@ -28,7 +28,7 @@ void updateExpectedFile(const TestData& data, const std::string& actual)
     }
 }
 
-void iterTestFiles(const std::string& folder, std::function<void(TestData&&)>&& test, IterTestFilesParam&& params)
+void iterTestFiles(const std::string& folder, std::function<void(const TestData&)>&& test, IterTestFilesParam&& params)
 {
     boost::ut::test(folder) = [&] {
         const auto path = params.folder_is_resource ? getResourcePath(folder) : folder;
@@ -58,7 +58,7 @@ void iterTestFiles(const std::string& folder, std::function<void(TestData&&)>&&
                 .is_folder = is_directory(entry.path())
             };
 
-            test(std::move(data));
+            test(data);
         }
     };
 }
@@ -75,6 +75,7 @@ std::string sanitizeCodeError(const Ark::CodeError& e)
 
     std::string diag = stream.str();
     diag.erase(std::ranges::remove(diag, '\r').begin(), diag.end());
+
     while (diag.find(ARK_TESTS_ROOT) != std::string::npos)
         diag.erase(diag.find(ARK_TESTS_ROOT), std::size(ARK_TESTS_ROOT) - 1);
 
diff --git a/tests/unittests/TestsHelper.hpp b/tests/unittests/TestsHelper.hpp
index 726dd9fd..f5d58f27 100644
--- a/tests/unittests/TestsHelper.hpp
+++ b/tests/unittests/TestsHelper.hpp
@@ -52,7 +52,7 @@ void updateExpectedFile(const TestData& data, const std::string& actual);
  * @param test test function, taking a TestData&& with the paths of the input and its expected result
  * @param params optionally specify the expected extension. Defaults to "expected"
  */
-void iterTestFiles(const std::string& folder, std::function<void(TestData&&)>&& test, IterTestFilesParam&& params = {});
+void iterTestFiles(const std::string& folder, std::function<void(const TestData&)>&& test, IterTestFilesParam&& params = {});
 
 /**
  * @brief Given an input folder, returns the resource path relatives to the project root