Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/lldb/unittests/Core/StreamCallbackTest.cpp

@@ -0,0 +1,28 @@
+//===-- StreamCallbackTest.cpp ----------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Utility/StreamCallback.h"
+#include "gtest/gtest.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+static char test_baton;
+static size_t callback_count = 0;
+static void TestCallback(const char *data, void *baton) {
+  EXPECT_STREQ("Foobar", data);
+  EXPECT_EQ(&test_baton, baton);
+  ++callback_count;
+}
+
+TEST(StreamCallbackTest, Callback) {
+  StreamCallback stream(TestCallback, &test_baton);
+  stream << "Foobar";
+  EXPECT_EQ(1u, callback_count);
+}