diff --git a/tests/various/sv_implicit_ports.sh b/tests/various/sv_implicit_ports.sh
index 2faac2e..9a01447 100755
--- a/tests/various/sv_implicit_ports.sh
+++ b/tests/various/sv_implicit_ports.sh
@@ -65,3 +65,60 @@
 	add add_i(.*);
 endmodule
 EOT
+
+# Parameterised module
+../../yosys -f "verilog -sv" -qp "prep -flatten -top top; select -assert-count 1 t:\$add" - <<EOT
+module add #(parameter N=3) (input [N-1:0] a = 8'd00, input [N-1:0] b = 8'd01, output [N-1:0] q);
+assign q = a + b;
+endmodule
+
+module top(input [7:0] a, output [7:0] q);
+	add #(.N(8)) add_i(.*);
+endmodule
+EOT
+
+# Parameterised blackbox module
+../../yosys -f "verilog -sv" -qp "prep -flatten -top top; select -assert-count 1 t:add" - <<EOT
+(* blackbox *)
+module add #(parameter N=3) (input [N-1:0] a, b, output [N-1:0] q);
+endmodule
+
+module top(input [7:0] a, b, output [7:0] q);
+	add #(.N(8)) add_i(.*);
+endmodule
+EOT
+
+# Parameterised blackbox module - incorrect width
+((../../yosys -f "verilog -sv" -qp "prep -flatten -top top; select -assert-count 1 t:add" - || true) <<EOT
+(* blackbox *)
+module add #(parameter N=3) (input [N-1:0] a, b, output [N-1:0] q);
+endmodule
+
+module top(input [7:0] a, b, output [7:0] q);
+	add #(.N(6)) add_i(.*);
+endmodule
+EOT
+) 2>&1 | grep -F "ERROR: Width mismatch between wire (8 bits) and port (6 bits) for implicit port connection \`q' of cell top.add_i (add)." > /dev/null
+
+# Mixed implicit and explicit 1
+../../yosys -f "verilog -sv" -qp "prep -flatten -top top; select -assert-count 1 t:\$add" - <<EOT
+module add(input [7:0] a, input [7:0] b, output [7:0] q);
+	assign q = a + b;
+endmodule
+
+module top(input [7:0] a, output [7:0] q);
+	add add_i(.b(8'd42), .*);
+endmodule
+EOT
+
+# Mixed implicit and explicit 2
+(../../yosys -f "verilog -sv" -qp "prep -flatten -top top; select -assert-count 1 t:\$add" - <<EOT
+module add(input [7:0] a, input [7:0] b, output [7:0] q);
+	assign q = a + b;
+endmodule
+
+module top(input [7:0] a, input [9:0] b, output [7:0] q);
+	add add_i(.b, .*);
+endmodule
+EOT
+) 2>&1 | grep -F "Warning: Resizing cell port top.add_i.b from 10 bits to 8 bits." > /dev/null