1 files changed, 43 insertions, 0 deletions
diff --git a/backend/unittests/Support/TextDiagnosticTest.cpp b/backend/unittests/Support/TextDiagnosticTest.cpp
new file mode 100644
index 0000000..cd28027
--- /dev/null
+++ b/backend/unittests/Support/TextDiagnosticTest.cpp
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rcc/Support/TextDiagnostic.h"
+
+#include <iostream>
+#include <string>
+
+namespace {
+
+int fail(const char *Message) {
+  std::cerr << Message << '\n';
+  return 1;
+}
+
+} // namespace
+
+int main() {
+  rcc::TextSource Source("input.mir", "first\r\nsecond line\n");
+  if (Source.lineCount() != 3)
+    return fail("TextSource must index every physical line");
+  if (Source.line(1) != "first" || Source.line(2) != "second line" || !Source.line(3).empty())
+    return fail("TextSource must expose lines without line endings");
+
+  const rcc::TextRange Range = Source.range(9, 15);
+  if (Range.Begin.Line != 2 || Range.Begin.Column != 3 || Range.End.Line != 2 ||
+      Range.End.Column != 9)
+    return fail("TextSource must map byte offsets to one-based line and column values");
+
+  const rcc::TextDiagnostic Diagnostic{
+      .Severity = rcc::DiagnosticSeverity::Error,
+      .Category = "yaml",
+      .Message = "invalid scalar",
+      .SourceName = "input.mir",
+      .Range = Range,
+  };
+  const std::string Formatted = rcc::formatTextDiagnostic(Diagnostic, Source);
+  if (Formatted != "input.mir:2:3: error[yaml]: invalid scalar\nsecond line\n  ^~~~~~")
+    return fail("Text diagnostics must have deterministic source rendering");
+
+  if (rcc::getDiagnosticSeverityName(rcc::DiagnosticSeverity::Warning) != "warning")
+    return fail("Diagnostic severities must have stable names");
+  return 0;
+}