1 files changed, 59 insertions, 0 deletions
diff --git a/tests/various/hierarchy.sh b/tests/various/hierarchy.sh
new file mode 100644
index 000000000..d33a247be
--- /dev/null
+++ b/tests/various/hierarchy.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+# Simple test of hierarchy -auto-top.
+
+set -e
+
+echo -n "  TOP first - "
+../../yosys -s - <<- EOY | grep "Automatically selected TOP as design top module"
+  read_verilog << EOV
+    module TOP(a, y);
+      input a;
+      output [31:0] y;
+
+      aoi12 p [31:0] (a, y);
+    endmodule
+
+    module aoi12(a, y);
+      input a;
+      output y;
+      assign y = ~a;
+    endmodule
+  EOV
+  hierarchy -auto-top
+EOY
+
+echo -n "  TOP last - "
+../../yosys -s - <<- EOY | grep "Automatically selected TOP as design top module"
+  read_verilog << EOV
+    module aoi12(a, y);
+      input a;
+      output y;
+      assign y = ~a;
+    endmodule
+
+    module TOP(a, y);
+      input a;
+      output [31:0] y;
+
+      aoi12 foo (a, y);
+    endmodule
+  EOV
+  hierarchy -auto-top
+EOY
+
+echo -n "  no explicit top - "
+../../yosys -s - <<- EOY | grep "Automatically selected noTop as design top module."
+  read_verilog << EOV
+    module aoi12(a, y);
+      input a;
+      output y;
+      assign y = ~a;
+    endmodule
+
+    module noTop(a, y);
+      input a;
+      output [31:0] y;
+    endmodule
+  EOV
+  hierarchy -auto-top
+EOY