diff --git a/testdata/thresholdeq.go b/testdata/thresholdeq.go
new file mode 100644
index 0000000..fd736b5
--- /dev/null
+++ b/testdata/thresholdeq.go
@@ -0,0 +1,47 @@
+package main
+
+import "fmt"
+
+type Thresholdeq int
+
+const (
+	req1  Thresholdeq = 2
+	req2  Thresholdeq = 4
+	req3  Thresholdeq = 6
+	req4  Thresholdeq = 8
+	req5  Thresholdeq = 10
+	req6  Thresholdeq = 12
+	req7  Thresholdeq = 14
+	req8  Thresholdeq = 16
+	req9  Thresholdeq = 18
+	req10 Thresholdeq = 20
+)
+
+func main() {
+	ck(1, "Thresholdeq(1)")
+	ck(req1, "req1")
+	ck(3, "Thresholdeq(3)")
+	ck(req2, "req2")
+	ck(5, "Thresholdeq(5)")
+	ck(req3, "req3")
+	ck(7, "Thresholdeq(7)")
+	ck(req4, "req4")
+	ck(9, "Thresholdeq(9)")
+	ck(req5, "req5")
+	ck(11, "Thresholdeq(11)")
+	ck(req6, "req6")
+	ck(13, "Thresholdeq(13)")
+	ck(req7, "req7")
+	ck(15, "Thresholdeq(15)")
+	ck(req8, "req8")
+	ck(17, "Thresholdeq(17)")
+	ck(req9, "req9")
+	ck(19, "Thresholdeq(19)")
+	ck(req10, "req10")
+}
+
+func ck(thresholdeq Thresholdeq, str string) {
+	if fmt.Sprint(thresholdeq) != str {
+		panic("thresholdeq.go: " + str)
+	}
+}
diff --git a/testdata/thresholdgt.go b/testdata/thresholdgt.go
new file mode 100644
index 0000000..88e589c
--- /dev/null
+++ b/testdata/thresholdgt.go
@@ -0,0 +1,50 @@
+package main
+
+import "fmt"
+
+type Thresholdgt int
+
+const (
+	rgt1  Thresholdgt = 2
+	rgt2  Thresholdgt = 4
+	rgt3  Thresholdgt = 6
+	rgt4  Thresholdgt = 8
+	rgt5  Thresholdgt = 10
+	rgt6  Thresholdgt = 12
+	rgt7  Thresholdgt = 14
+	rgt8  Thresholdgt = 16
+	rgt9  Thresholdgt = 18
+	rgt10 Thresholdgt = 20
+	rgt11 Thresholdgt = 22
+)
+
+func main() {
+	ck(1, "Thresholdgt(1)")
+	ck(rgt1, "rgt1")
+	ck(3, "Thresholdgt(3)")
+	ck(rgt2, "rgt2")
+	ck(5, "Thresholdgt(5)")
+	ck(rgt3, "rgt3")
+	ck(7, "Thresholdgt(7)")
+	ck(rgt4, "rgt4")
+	ck(9, "Thresholdgt(9)")
+	ck(rgt5, "rgt5")
+	ck(11, "Thresholdgt(11)")
+	ck(rgt6, "rgt6")
+	ck(13, "Thresholdgt(13)")
+	ck(rgt7, "rgt7")
+	ck(15, "Thresholdgt(15)")
+	ck(rgt8, "rgt8")
+	ck(17, "Thresholdgt(17)")
+	ck(rgt9, "rgt9")
+	ck(19, "Thresholdgt(19)")
+	ck(rgt10, "rgt10")
+	ck(21, "Thresholdgt(21)")
+	ck(rgt11, "rgt11")
+}
+
+func ck(thresholdgt Thresholdgt, str string) {
+	if fmt.Sprint(thresholdgt) != str {
+		panic("thresholdgt.go: " + str)
+	}
+}
\ No newline at end of file
diff --git a/testdata/thresholdlt.go b/testdata/thresholdlt.go
new file mode 100644
index 0000000..603f382
--- /dev/null
+++ b/testdata/thresholdlt.go
@@ -0,0 +1,44 @@
+package main
+
+import "fmt"
+
+type Thresholdlt int
+
+const (
+	rlt1 Thresholdlt = 2
+	rlt2 Thresholdlt = 4
+	rlt3 Thresholdlt = 6
+	rlt4 Thresholdlt = 8
+	rlt5 Thresholdlt = 10
+	rlt6 Thresholdlt = 12
+	rlt7 Thresholdlt = 14
+	rlt8 Thresholdlt = 16
+	rlt9 Thresholdlt = 18
+)
+
+func main() {
+	ck(1, "Thresholdlt(1)")
+	ck(rlt1, "rlt1")
+	ck(3, "Thresholdlt(3)")
+	ck(rlt2, "rlt2")
+	ck(5, "Thresholdlt(5)")
+	ck(rlt3, "rlt3")
+	ck(7, "Thresholdlt(7)")
+	ck(rlt4, "rlt4")
+	ck(9, "Thresholdlt(9)")
+	ck(rlt5, "rlt5")
+	ck(11, "Thresholdlt(11)")
+	ck(rlt6, "rlt6")
+	ck(13, "Thresholdlt(13)")
+	ck(rlt7, "rlt7")
+	ck(15, "Thresholdlt(15)")
+	ck(rlt8, "rlt8")
+	ck(17, "Thresholdlt(17)")
+	ck(rlt9, "rlt9")
+}
+
+func ck(thresholdlt Thresholdlt, str string) {
+	if fmt.Sprint(thresholdlt) != str {
+		panic("thresholdlt.go: " + str)
+	}
+}