1 files changed, 54 insertions, 0 deletions
diff --git a/clang-tools-extra/test/clang-tidy/misc-string-constructor.cpp b/clang-tools-extra/test/clang-tidy/misc-string-constructor.cpp
new file mode 100644
index 00000000000..ef6ae8acd31
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/misc-string-constructor.cpp
@@ -0,0 +1,54 @@
+// RUN: %check_clang_tidy %s misc-string-constructor %t
+
+namespace std {
+template <typename T>
+class allocator {};
+template <typename T>
+class char_traits {};
+template <typename C, typename T = std::char_traits<C>, typename A = std::allocator<C> >
+struct basic_string {
+  basic_string();
+  basic_string(const C*, unsigned int size);
+  basic_string(unsigned int size, C c);
+};
+typedef basic_string<char> string;
+typedef basic_string<wchar_t> wstring;
+}
+
+const char* kText = "";
+const char kText2[] = "";
+extern const char kText3[];
+
+void Test() {
+  std::string str('x', 4);
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: constructor parameters are probably swapped [misc-string-constructor]
+  std::wstring wstr(L'x', 4);
+  // CHECK-MESSAGES: [[@LINE-1]]:16: warning: constructor parameters are probably swapped
+  std::string s0(0, 'x');
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: constructor creating an empty string
+  std::string s1(-4, 'x');
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: negative value used as length parameter
+  std::string s2(0x1000000, 'x');
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: suspicious large length parameter
+  
+  std::string q0("test", 0);
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: constructor creating an empty string
+  std::string q1(kText, -4);
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: negative value used as length parameter
+  std::string q2("test", 200);
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: length is bigger then string literal size
+  std::string q3(kText, 200);
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: length is bigger then string literal size
+  std::string q4(kText2, 200);
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: length is bigger then string literal size
+  std::string q5(kText3,  0x1000000);
+  // CHECK-MESSAGES: [[@LINE-1]]:15: warning: suspicious large length parameter
+}
+
+void Valid() {
+  std::string empty();
+  std::string str(4, 'x');
+  std::wstring wstr(4, L'x');
+  std::string s1("test", 4);
+  std::string s2("test", 3);
+}