diff --git a/tests/simple/graphtest.v b/tests/simple/graphtest.v
new file mode 100644
index 000000000..74788dbbe
--- /dev/null
+++ b/tests/simple/graphtest.v
@@ -0,0 +1,34 @@
+module graphtest (A,B,X,Y,Z);
+
+input      [3:0] A;
+input      [3:0] B;
+output reg [3:0] X;
+output     [9:0] Y;
+output     [7:0] Z;
+
+wire [4:0] t;
+
+assign t[4] = 1'b0;                      // Constant connects to wire
+assign t[2:0] = A[2:0] & { 2'b10, B[3]}; // Concatenation of intermediate wire
+assign t[3] = A[2] ^ B[3];               // Bitwise-XOR
+
+// assign Y[2:0] = 3'b111;
+// assign Y[6:3] = A;
+// assign Y[9:7] = t[0:2];
+assign Y = {3'b111, A, t[2:0]};          // Direct assignment of concatenation
+
+assign Z[0] = 1'b0;                      // Constant connects to PO
+assign Z[1] = t[3];                      // Intermediate sig connects to PO
+assign Z[3:2] = A[2:1];                  // PI connects to PO
+assign Z[7:4] = {1'b0, B[2:0]};          // Concat of CV and PI connect to PO
+
+always @* begin
+  if (A == 4'b1111) begin                // All-Const at port (eq)
+    X = B;
+  end 
+  else begin
+    X = 4'b0000;                         // All-Const at port (mux)
+  end
+end
+
+endmodule