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diff --git a/unittests/Sema/CodeCompleteTest.cpp b/unittests/Sema/CodeCompleteTest.cpp
new file mode 100644
index 000000000000..04cb14b971ec
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+++ b/unittests/Sema/CodeCompleteTest.cpp
@@ -0,0 +1,145 @@
+//=== unittests/Sema/CodeCompleteTest.cpp - Code Complete tests ==============//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendActions.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Parse/ParseAST.h"
+#include "clang/Sema/Sema.h"
+#include "clang/Sema/SemaDiagnostic.h"
+#include "clang/Tooling/Tooling.h"
+#include "gtest/gtest.h"
+#include "gmock/gmock.h"
+
+namespace {
+
+using namespace clang;
+using namespace clang::tooling;
+using ::testing::UnorderedElementsAre;
+
+const char TestCCName[] = "test.cc";
+using VisitedContextResults = std::vector<std::string>;
+
+class VisitedContextFinder: public CodeCompleteConsumer {
+public:
+  VisitedContextFinder(VisitedContextResults &Results)
+      : CodeCompleteConsumer(/*CodeCompleteOpts=*/{},
+                             /*CodeCompleteConsumer*/ false),
+        VCResults(Results),
+        CCTUInfo(std::make_shared<GlobalCodeCompletionAllocator>()) {}
+
+  void ProcessCodeCompleteResults(Sema &S, CodeCompletionContext Context,
+                                  CodeCompletionResult *Results,
+                                  unsigned NumResults) override {
+    VisitedContexts = Context.getVisitedContexts();
+    VCResults = getVisitedNamespace();
+  }
+
+  CodeCompletionAllocator &getAllocator() override {
+    return CCTUInfo.getAllocator();
+  }
+
+  CodeCompletionTUInfo &getCodeCompletionTUInfo() override { return CCTUInfo; }
+
+  std::vector<std::string> getVisitedNamespace() const {
+    std::vector<std::string> NSNames;
+    for (const auto *Context : VisitedContexts)
+      if (const auto *NS = llvm::dyn_cast<NamespaceDecl>(Context))
+        NSNames.push_back(NS->getQualifiedNameAsString());
+    return NSNames;
+  }
+
+private:
+  VisitedContextResults& VCResults;
+  CodeCompletionTUInfo CCTUInfo;
+  CodeCompletionContext::VisitedContextSet VisitedContexts;
+};
+
+class CodeCompleteAction : public SyntaxOnlyAction {
+public:
+  CodeCompleteAction(ParsedSourceLocation P, VisitedContextResults &Results)
+      : CompletePosition(std::move(P)), VCResults(Results) {}
+
+  bool BeginInvocation(CompilerInstance &CI) override {
+    CI.getFrontendOpts().CodeCompletionAt = CompletePosition;
+    CI.setCodeCompletionConsumer(new VisitedContextFinder(VCResults));
+    return true;
+  }
+
+private:
+  // 1-based code complete position <Line, Col>;
+  ParsedSourceLocation CompletePosition;
+  VisitedContextResults& VCResults;
+};
+
+ParsedSourceLocation offsetToPosition(llvm::StringRef Code, size_t Offset) {
+  Offset = std::min(Code.size(), Offset);
+  StringRef Before = Code.substr(0, Offset);
+  int Lines = Before.count('\n');
+  size_t PrevNL = Before.rfind('\n');
+  size_t StartOfLine = (PrevNL == StringRef::npos) ? 0 : (PrevNL + 1);
+  return {TestCCName, static_cast<unsigned>(Lines + 1),
+          static_cast<unsigned>(Offset - StartOfLine + 1)};
+}
+
+VisitedContextResults runCodeCompleteOnCode(StringRef Code) {
+  VisitedContextResults Results;
+  auto TokenOffset = Code.find('^');
+  assert(TokenOffset != StringRef::npos &&
+         "Completion token ^ wasn't found in Code.");
+  std::string WithoutToken = Code.take_front(TokenOffset);
+  WithoutToken += Code.drop_front(WithoutToken.size() + 1);
+  assert(StringRef(WithoutToken).find('^') == StringRef::npos &&
+         "expected exactly one completion token ^ inside the code");
+
+  auto Action = llvm::make_unique<CodeCompleteAction>(
+      offsetToPosition(WithoutToken, TokenOffset), Results);
+  clang::tooling::runToolOnCodeWithArgs(Action.release(), Code, {"-std=c++11"},
+                                        TestCCName);
+  return Results;
+}
+
+TEST(SemaCodeCompleteTest, VisitedNSForValidQualifiedId) {
+  auto VisitedNS = runCodeCompleteOnCode(R"cpp(
+     namespace ns1 {}
+     namespace ns2 {}
+     namespace ns3 {}
+     namespace ns3 { namespace nns3 {} }
+
+     namespace foo {
+     using namespace ns1;
+     namespace ns4 {} // not visited
+     namespace { using namespace ns2; }
+     inline namespace bar { using namespace ns3::nns3; }
+     } // foo
+     namespace ns { foo::^ }
+  )cpp");
+  EXPECT_THAT(VisitedNS, UnorderedElementsAre("foo", "ns1", "ns2", "ns3::nns3",
+                                              "foo::(anonymous)"));
+}
+
+TEST(SemaCodeCompleteTest, VisitedNSForInvalideQualifiedId) {
+  auto VisitedNS = runCodeCompleteOnCode(R"cpp(
+     namespace ns { foo::^ }
+  )cpp");
+  EXPECT_TRUE(VisitedNS.empty());
+}
+
+TEST(SemaCodeCompleteTest, VisitedNSWithoutQualifier) {
+  auto VisitedNS = runCodeCompleteOnCode(R"cpp(
+    namespace n1 {
+    namespace n2 {
+      void f(^) {}
+    }
+    }
+  )cpp");
+  EXPECT_THAT(VisitedNS, UnorderedElementsAre("n1", "n1::n2"));
+}
+
+} // namespace