--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-show-locus-generate-patch.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,111 @@
+/* { dg-do compile } */
+/* { dg-options "-O -fdiagnostics-generate-patch" } */
+
+/* This is a collection of unittests for diagnostic_show_locus;
+   see the overview in diagnostic_plugin_test_show_locus.c.
+
+   In particular, note the discussion of why we need a very long line here:
+01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
+   and that we can't use macros in this file.  */
+
+/* Unit test for rendering of insertion fixit hints
+   (example taken from PR 62316).  */
+
+void test_fixit_insert (void)
+{
+#if 0
+   int a[2][2] = { 0, 1 , 2, 3 }; /* { dg-warning "insertion hints" } */
+#endif
+}
+
+/* Unit test for rendering of "remove" fixit hints.  */
+
+void test_fixit_remove (void)
+{
+#if 0
+  int a;; /* { dg-warning "example of a removal hint" } */
+#endif
+}
+
+/* Unit test for rendering of "replace" fixit hints.  */
+
+void test_fixit_replace (void)
+{
+#if 0
+  gtk_widget_showall (dlg); /* { dg-warning "example of a replacement hint" } */
+#endif
+}
+
+/* Unit test for rendering of fix-it hints that add new lines.  */
+
+void test_fixit_insert_newline (void)
+{
+#if 0
+  switch (op)
+    {
+    case 'a':
+      x = a;
+    case 'b': /* { dg-warning "newline insertion" } */
+      x = b;
+    }
+#endif
+}
+
+/* Unit test for mutually-exclusive suggestions.  */
+
+void test_mutually_exclusive_suggestions (void)
+{
+#if 0
+  original; /* { dg-warning "warning 1" } */
+/* { dg-warning "warning 2" "" { target *-*-* } .-1 } */
+/* We should not print the mutually-incompatible fix-it hints within
+   the generated patch; they are not listed in the big expected
+   multiline output below.  */
+#endif
+}
+
+/* Verify the output from -fdiagnostics-generate-patch.
+   We expect a header, containing the filename.  This is the absolute path,
+   so we can only capture it via regexps.  */
+
+/* { dg-regexp "\\-\\-\\- .*" } */
+/* { dg-regexp "\\+\\+\\+ .*" } */
+
+/* Next, we expect the diff itself.  */
+/* { dg-begin-multiline-output "" }
+@@ -14,7 +14,7 @@
+ void test_fixit_insert (void)
+ {
+ #if 0
+-   int a[2][2] = { 0, 1 , 2, 3 };
++   int a[2][2] = { {0, 1} , 2, 3 };
+ #endif
+ }
+ 
+@@ -23,7 +23,7 @@
+ void test_fixit_remove (void)
+ {
+ #if 0
+-  int a;;
++  int a;
+ #endif
+ }
+ 
+@@ -32,7 +32,7 @@
+ void test_fixit_replace (void)
+ {
+ #if 0
+-  gtk_widget_showall (dlg);
++  gtk_widget_show_all (dlg);
+ #endif
+ }
+ 
+@@ -45,6 +45,7 @@
+     {
+     case 'a':
+       x = a;
++      break;
+     case 'b':
+       x = b;
+     }
+   { dg-end-multiline-output "" } */