diff --git a/decor/percentage_test.go b/decor/percentage_test.go
new file mode 100644
index 0000000..bbddf5b
--- /dev/null
+++ b/decor/percentage_test.go
@@ -0,0 +1,58 @@
+package decor
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestPercentageType(t *testing.T) {
+	cases := map[string]struct {
+		value    float64
+		verb     string
+		expected string
+	}{
+		"10 %d":   {10, "%d", "10%"},
+		"10 %s":   {10, "%s", "10%"},
+		"10 %f":   {10, "%f", "10.000000%"},
+		"10 %.6f": {10, "%.6f", "10.000000%"},
+		"10 %.0f": {10, "%.0f", "10%"},
+		"10 %.1f": {10, "%.1f", "10.0%"},
+		"10 %.2f": {10, "%.2f", "10.00%"},
+		"10 %.3f": {10, "%.3f", "10.000%"},
+
+		"10 % d":   {10, "% d", "10 %"},
+		"10 % s":   {10, "% s", "10 %"},
+		"10 % f":   {10, "% f", "10.000000 %"},
+		"10 % .6f": {10, "% .6f", "10.000000 %"},
+		"10 % .0f": {10, "% .0f", "10 %"},
+		"10 % .1f": {10, "% .1f", "10.0 %"},
+		"10 % .2f": {10, "% .2f", "10.00 %"},
+		"10 % .3f": {10, "% .3f", "10.000 %"},
+
+		"10.5 %d":   {10.5, "%d", "10%"},
+		"10.5 %s":   {10.5, "%s", "10%"},
+		"10.5 %f":   {10.5, "%f", "10.500000%"},
+		"10.5 %.6f": {10.5, "%.6f", "10.500000%"},
+		"10.5 %.0f": {10.5, "%.0f", "10%"},
+		"10.5 %.1f": {10.5, "%.1f", "10.5%"},
+		"10.5 %.2f": {10.5, "%.2f", "10.50%"},
+		"10.5 %.3f": {10.5, "%.3f", "10.500%"},
+
+		"10.5 % d":   {10.5, "% d", "10 %"},
+		"10.5 % s":   {10.5, "% s", "10 %"},
+		"10.5 % f":   {10.5, "% f", "10.500000 %"},
+		"10.5 % .6f": {10.5, "% .6f", "10.500000 %"},
+		"10.5 % .0f": {10.5, "% .0f", "10 %"},
+		"10.5 % .1f": {10.5, "% .1f", "10.5 %"},
+		"10.5 % .2f": {10.5, "% .2f", "10.50 %"},
+		"10.5 % .3f": {10.5, "% .3f", "10.500 %"},
+	}
+	for name, tc := range cases {
+		t.Run(name, func(t *testing.T) {
+			got := fmt.Sprintf(tc.verb, percentageType(tc.value))
+			if got != tc.expected {
+				t.Fatalf("expected: %q, got: %q\n", tc.expected, got)
+			}
+		})
+	}
+}