1 files changed, 56 insertions, 0 deletions
diff --git a/lldb/unittests/Core/LogTest.cpp b/lldb/unittests/Core/LogTest.cpp
new file mode 100644
index 00000000000..46640edfb15
--- /dev/null
+++ b/lldb/unittests/Core/LogTest.cpp
@@ -0,0 +1,56 @@
+//===-- LogTest.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/Core/Log.h"
+#include "lldb/Core/StreamString.h"
+#include "lldb/Host/Host.h"
+#include "gtest/gtest.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+static std::string GetLogString(uint32_t log_options, const char *format,
+                                int arg) {
+  std::shared_ptr<StreamString> stream_sp(new StreamString());
+  Log log_(stream_sp);
+  log_.GetOptions().Reset(log_options);
+  Log *log = &log_;
+  LLDB_LOG(log, format, arg);
+  return stream_sp->GetString();
+}
+
+TEST(LogTest, LLDB_LOG_nullptr) {
+  Log *log = nullptr;
+  LLDB_LOG(log, "{0}", 0); // Shouldn't crash
+}
+
+TEST(LogTest, log_options) {
+  EXPECT_EQ("Hello World 47\n", GetLogString(0, "Hello World {0}", 47));
+  EXPECT_EQ("Hello World 47\n",
+            GetLogString(LLDB_LOG_OPTION_THREADSAFE, "Hello World {0}", 47));
+
+  {
+    std::string msg =
+        GetLogString(LLDB_LOG_OPTION_PREPEND_SEQUENCE, "Hello World {0}", 47);
+    int seq_no;
+    EXPECT_EQ(1, sscanf(msg.c_str(), "%d Hello World 47", &seq_no));
+  }
+
+  EXPECT_EQ(
+      "LogTest.cpp:GetLogString                                     Hello "
+      "World 47\n",
+      GetLogString(LLDB_LOG_OPTION_PREPEND_FILE_FUNCTION, "Hello World {0}", 47));
+
+  EXPECT_EQ(llvm::formatv("[{0}/{1}] Hello World 47\n",
+                          Host::GetCurrentProcessID(),
+                          Host::GetCurrentThreadID())
+                .str(),
+            GetLogString(LLDB_LOG_OPTION_PREPEND_PROC_AND_THREAD,
+                         "Hello World {0}", 47));
+}