1 files changed, 33 insertions, 0 deletions
diff --git a/backend/unittests/Support/ErrorTest.cpp b/backend/unittests/Support/ErrorTest.cpp
new file mode 100644
index 0000000..23140e3
--- /dev/null
+++ b/backend/unittests/Support/ErrorTest.cpp
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rcc/Support/Error.h"
+
+#include <iostream>
+#include <string>
+
+namespace {
+
+int fail(const char *Message) {
+  std::cerr << Message << '\n';
+  return 1;
+}
+
+} // namespace
+
+int main() {
+  rcc::Expected<int> Value = 42;
+  if (!Value || *Value != 42)
+    return fail("Expected must preserve a successful value");
+
+  rcc::Expected<int> Failure = rcc::makeUnexpected(rcc::ErrorCode::ParseError, "bad MIR");
+  if (Failure)
+    return fail("Expected must preserve an error");
+  if (Failure.error().code() != rcc::ErrorCode::ParseError)
+    return fail("Error must preserve its code");
+  if (Failure.error().message() != "bad MIR")
+    return fail("Error must preserve its message");
+  if (rcc::getErrorCodeName(Failure.error().code()) != "parse error")
+    return fail("Error code must have a stable name");
+
+  return 0;
+}