1 files changed, 58 insertions, 0 deletions
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone-branch-clone-if-constexpr-template.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone-branch-clone-if-constexpr-template.cpp
new file mode 100644
index 00000000000..382330139c8
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone-branch-clone-if-constexpr-template.cpp
@@ -0,0 +1,58 @@
+// RUN: %check_clang_tidy %s bugprone-branch-clone %t -- -- -std=c++17
+
+void handle(int);
+
+template <unsigned Index>
+void shouldFail() {
+  if constexpr (Index == 0) {
+    // CHECK-MESSAGES: :[[@LINE-1]]:29: warning: repeated branch in conditional chain [bugprone-branch-clone]
+    handle(0);
+  } else if constexpr (Index == 1) {
+    handle(1);
+  } else {
+    handle(0);
+  }
+}
+
+template <unsigned Index>
+void shouldPass() {
+  if constexpr (Index == 0) {
+    handle(0);
+  } else if constexpr (Index == 1) {
+    handle(1);
+  } else {
+    handle(2);
+  }
+}
+
+void shouldFailNonTemplate() {
+  constexpr unsigned Index = 1;
+  if constexpr (Index == 0) {
+    // CHECK-MESSAGES: :[[@LINE-1]]:29: warning: repeated branch in conditional chain [bugprone-branch-clone]
+    handle(0);
+  } else if constexpr (Index == 1) {
+    handle(1);
+  } else {
+    handle(0);
+  }
+}
+
+void shouldPassNonTemplate() {
+  constexpr unsigned Index = 1;
+  if constexpr (Index == 0) {
+    handle(0);
+  } else if constexpr (Index == 1) {
+    handle(1);
+  } else {
+    handle(2);
+  }
+}
+
+void run() {
+    shouldFail<0>();
+    shouldFail<1>();
+    shouldFail<2>();
+    shouldPass<0>();
+    shouldPass<1>();
+    shouldPass<2>();
+}