1 files changed, 35 insertions, 0 deletions
diff --git a/unittests/Support/CommandLineTest.cpp b/unittests/Support/CommandLineTest.cpp
index 660df11446ac..1fb0213b4d18 100644
--- a/unittests/Support/CommandLineTest.cpp
+++ b/unittests/Support/CommandLineTest.cpp
@@ -613,4 +613,39 @@ TEST(CommandLineTest, ResponseFiles) {
   llvm::sys::fs::remove(TestDir);
 }
 
+TEST(CommandLineTest, SetDefautValue) {
+  cl::ResetCommandLineParser();
+
+  StackOption<std::string> Opt1("opt1", cl::init("true"));
+  StackOption<bool> Opt2("opt2", cl::init(true));
+  cl::alias Alias("alias", llvm::cl::aliasopt(Opt2));
+  StackOption<int> Opt3("opt3", cl::init(3));
+
+  const char *args[] = {"prog", "-opt1=false", "-opt2", "-opt3"};
+
+  EXPECT_TRUE(
+    cl::ParseCommandLineOptions(2, args, StringRef(), &llvm::nulls()));
+
+  EXPECT_TRUE(Opt1 == "false");
+  EXPECT_TRUE(Opt2);
+  EXPECT_TRUE(Opt3 == 3);
+
+  Opt2 = false;
+  Opt3 = 1;
+
+  cl::ResetAllOptionOccurrences();
+
+  for (auto &OM : cl::getRegisteredOptions(*cl::TopLevelSubCommand)) {
+    cl::Option *O = OM.second;
+    if (O->ArgStr == "opt2") {
+      continue;
+    }
+    O->setDefault();
+  }
+
+  EXPECT_TRUE(Opt1 == "true");
+  EXPECT_TRUE(Opt2);
+  EXPECT_TRUE(Opt3 == 3);
+}
+
 }  // anonymous namespace