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diff --git a/gcc/diagnostics/selftest-context.h b/gcc/diagnostics/selftest-context.h
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+/* Selftest support for diagnostics.
+   Copyright (C) 2016-2025 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_DIAGNOSTICS_SELFTEST_CONTEXT_H
+#define GCC_DIAGNOSTICS_SELFTEST_CONTEXT_H
+
+/* The selftest code should entirely disappear in a production
+   configuration, hence we guard all of it with #if CHECKING_P.  */
+
+#if CHECKING_P
+
+namespace diagnostics {
+namespace selftest {
+
+/* Convenience subclass of diagnostics::context for testing
+   the diagnostic subsystem.  */
+
+class test_context : public context
+{
+ public:
+  test_context ();
+  ~test_context ();
+
+  /* Implementation of diagnostics::start_span_fn, hiding the
+     real filename (to avoid printing the names of tempfiles).  */
+  static void
+  start_span_cb (const location_print_policy &,
+		 to_text &sink,
+		 expanded_location exploc);
+
+  /* Report a diagnostic to this context.  For a selftest, this
+     should only be called on a context that uses a non-standard formatter
+     that e.g. gathers the results in memory, rather than emits to stderr.  */
+  bool
+  report (enum kind kind,
+	  rich_location &richloc,
+	  const metadata *,
+	  option_id opt_id,
+	  const char * fmt, ...) ATTRIBUTE_GCC_DIAG(6,7);
+
+  const char *test_show_locus (rich_location &richloc);
+
+  /* Setters for the context's source_printing_options
+     for use in selftests.  */
+  void colorize_source (bool val)
+  {
+    get_source_printing_options ().colorize_source_p = val;
+  }
+  void show_labels (bool val)
+  {
+    get_source_printing_options ().show_labels_p = val;
+  }
+  void show_line_numbers (bool val)
+  {
+    get_source_printing_options ().show_line_numbers_p = val;
+  }
+  void show_ruler (bool val)
+  {
+    get_source_printing_options ().show_ruler_p = val;
+  }
+  void show_event_links (bool val)
+  {
+    get_source_printing_options ().show_event_links_p = val;
+  }
+  void set_caret_char (unsigned idx, char ch)
+  {
+    gcc_assert (idx < rich_location::STATICALLY_ALLOCATED_RANGES);
+    get_source_printing_options ().caret_chars[idx] = ch;
+  }
+};
+
+} // namespace selftest
+} // namespace diagnostics
+
+#endif /* #if CHECKING_P */
+
+#endif /* GCC_DIAGNOSTICS_SELFTEST_CONTEXT_H */