diff --git a/test/Misc/show-diag-options.c b/test/Misc/show-diag-options.c
new file mode 100644
index 0000000..f0404a8
--- /dev/null
+++ b/test/Misc/show-diag-options.c
@@ -0,0 +1,27 @@
+// RUN: %clang_cc1 -fsyntax-only %s 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=BASE
+// RUN: %clang_cc1 -fsyntax-only -fdiagnostics-show-option %s 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=OPTION
+// RUN: %clang_cc1 -fsyntax-only -fdiagnostics-show-option -Werror %s 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=OPTION_ERROR
+// RUN: %clang_cc1 -fsyntax-only -std=c89 -pedantic -fdiagnostics-show-option %s 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=OPTION_PEDANTIC
+// RUN: %clang_cc1 -fsyntax-only -fdiagnostics-show-category id %s 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=CATEGORY_ID
+// RUN: %clang_cc1 -fsyntax-only -fdiagnostics-show-category name %s 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=CATEGORY_NAME
+// RUN: %clang_cc1 -fsyntax-only -fdiagnostics-show-option -fdiagnostics-show-category name -Werror %s 2>&1 \
+// RUN:   | FileCheck %s -check-prefix=OPTION_ERROR_CATEGORY
+
+void test(int x, int y) {
+  if (x = y) ++x;
+  // BASE: {{.*}}: warning: {{[a-z ]+$}}
+  // OPTION: {{.*}}: warning: {{[a-z ]+}} [-Wparentheses]
+  // OPTION_ERROR: {{.*}}: error: {{[a-z ]+}} [-Werror,-Wparentheses]
+  // CATEGORY_ID: {{.*}}: warning: {{[a-z ]+}} [2]
+  // CATEGORY_NAME: {{.*}}: warning: {{[a-z ]+}} [Semantic Issue]
+  // OPTION_ERROR_CATEGORY: {{.*}}: error: {{[a-z ]+}} [-Werror,-Wparentheses,Semantic Issue]
+
+  // Leverage the fact that all these '//'s get warned about in C89 pedantic.
+  // OPTION_PEDANTIC: {{.*}}: warning: {{[/a-z ]+}} [-pedantic,-Wcomment]
+}