diff --git a/test/basic/default_nettype.sv b/test/basic/default_nettype.sv
new file mode 100644
index 0000000..87f3f5d
--- /dev/null
+++ b/test/basic/default_nettype.sv
@@ -0,0 +1,22 @@
+`resetall
+
+`define TEST(t) \
+    `default_nettype t \
+    module test_``t; \
+        assign foo = 0; \
+    endmodule
+
+module top;
+    assign foo = 0;
+endmodule
+
+`TEST(tri)
+`TEST(triand)
+`TEST(trior)
+// `TEST(trireg)
+`TEST(tri0)
+`TEST(tri1)
+// `TEST(uwire)
+`TEST(wire)
+`TEST(wand)
+`TEST(wor)
diff --git a/test/basic/default_nettype.v b/test/basic/default_nettype.v
new file mode 100644
index 0000000..29ba270
--- /dev/null
+++ b/test/basic/default_nettype.v
@@ -0,0 +1,24 @@
+`resetall
+
+`define TEST(t) \
+    `default_nettype t \
+    module test_``t; \
+        t foo; \
+        assign foo = 0; \
+    endmodule
+
+module top;
+    wire foo;
+    assign foo = 0;
+endmodule
+
+`TEST(tri)
+`TEST(triand)
+`TEST(trior)
+// `TEST(trireg)
+`TEST(tri0)
+`TEST(tri1)
+// `TEST(uwire)
+`TEST(wire)
+`TEST(wand)
+`TEST(wor)
diff --git a/test/error/default_nettype_invalid.sv b/test/error/default_nettype_invalid.sv
new file mode 100644
index 0000000..196fd46
--- /dev/null
+++ b/test/error/default_nettype_invalid.sv
@@ -0,0 +1,4 @@
+`default_nettype invalid
+module top;
+    assign foo = 0;
+endmodule
diff --git a/test/error/default_nettype_none.sv b/test/error/default_nettype_none.sv
new file mode 100644
index 0000000..e5e5cae
--- /dev/null
+++ b/test/error/default_nettype_none.sv
@@ -0,0 +1,4 @@
+`default_nettype none
+module top;
+    assign foo = 0;
+endmodule