diff --git a/test/ASTMerge/Inputs/namespace1.cpp b/test/ASTMerge/Inputs/namespace1.cpp
new file mode 100644
index 0000000..1ff84f3
--- /dev/null
+++ b/test/ASTMerge/Inputs/namespace1.cpp
@@ -0,0 +1,17 @@
+// Merge success
+namespace N1 {
+  int x;
+}
+
+// Merge multiple namespaces
+namespace N2 {
+  extern int x;
+}
+namespace N2 {
+  extern float y;
+}
+
+// Merge namespace with conflict
+namespace N3 {
+  extern float z;
+}
diff --git a/test/ASTMerge/Inputs/namespace2.cpp b/test/ASTMerge/Inputs/namespace2.cpp
new file mode 100644
index 0000000..80429f7
--- /dev/null
+++ b/test/ASTMerge/Inputs/namespace2.cpp
@@ -0,0 +1,17 @@
+// Merge success
+namespace N1 {
+  extern int x0;
+}
+
+// Merge multiple namespaces
+namespace N2 {
+  extern int x;
+}
+namespace N2 {
+  extern float y;
+}
+
+// Merge namespace with conflict
+namespace N3 {
+  extern double z;
+}